PM: rework signal handling
- introduce PROC_STOPPED flag, which tracks whether the process is stopped on PROC_STOP in the kernel, rather than implicitly deriving this from PM_SIG_PENDING; - make the process resumption test based on current state rather than state transitions; - add and clarify several flag checks in the signal handling code; - add test79 to test signal handling robustness. Change-Id: Ic8c7527095035b300b56f2ab1b9dd190bd4bf001
This commit is contained in:
David van Moolenbroek
Lionel Sambuc
parent
4d4e70daaa
commit
595d73a896
12 changed files with 715 additions and 114 deletions
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@ -5800,6 +5800,7 @@
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./usr/tests/minix-posix/test76 minix-sys
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./usr/tests/minix-posix/test77 minix-sys
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./usr/tests/minix-posix/test78 minix-sys
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./usr/tests/minix-posix/test79 minix-sys
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./usr/tests/minix-posix/test8 minix-sys
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./usr/tests/minix-posix/test9 minix-sys
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./usr/tests/minix-posix/testinterp minix-sys
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@ -25,11 +25,11 @@ static char *flags_str(int flags)
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str[1] = (flags & ZOMBIE) ? 'Z' : '-';
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str[2] = (flags & ALARM_ON) ? 'A' : '-';
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str[3] = (flags & EXITING) ? 'E' : '-';
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str[4] = (flags & STOPPED) ? 'S' : '-';
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str[4] = (flags & TRACE_STOPPED) ? 'T' : '-';
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str[5] = (flags & SIGSUSPENDED) ? 'U' : '-';
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str[6] = (flags & REPLY) ? 'R' : '-';
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str[7] = (flags & VFS_CALL) ? 'F' : '-';
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str[8] = (flags & PM_SIG_PENDING) ? 's' : '-';
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str[8] = (flags & PROC_STOPPED) ? 's' : '-';
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str[9] = (flags & PRIV_PROC) ? 'p' : '-';
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str[10] = (flags & PARTIAL_EXEC) ? 'x' : '-';
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str[11] = (flags & DELAY_CALL) ? 'd' : '-';
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@ -296,8 +296,15 @@ int dump_core; /* flag indicating whether to dump core */
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* This order is important so that VFS can tell drivers to cancel requests
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* such as copying to/ from the exiting process, before it is gone.
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*/
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/* If the process is not yet stopped, we force a stop here. This means that
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* the process may still have a delay call pending. For this reason, the main
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* message loop discards requests from exiting processes.
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*/
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if (!(rmp->mp_flags & PROC_STOPPED)) {
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if ((r = sys_stop(proc_nr_e)) != OK) /* stop the process */
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panic("sys_stop failed: %d", r);
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rmp->mp_flags |= PROC_STOPPED;
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}
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if((r=vm_willexit(proc_nr_e)) != OK) {
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panic("exit_proc: vm_willexit failed: %d", r);
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@ -337,7 +344,7 @@ int dump_core; /* flag indicating whether to dump core */
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/* Clean up most of the flags describing the process's state before the exit,
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* and mark it as exiting.
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*/
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rmp->mp_flags &= (IN_USE|VFS_CALL|PRIV_PROC|TRACE_EXIT);
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rmp->mp_flags &= (IN_USE|VFS_CALL|PRIV_PROC|TRACE_EXIT|PROC_STOPPED);
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rmp->mp_flags |= EXITING;
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/* Keep the process around until VFS is finished with it. */
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@ -475,7 +482,7 @@ int do_waitpid()
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check_parent(rp, TRUE /*try_cleanup*/);
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return(SUSPEND);
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}
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if (rp->mp_flags & STOPPED) {
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if (rp->mp_flags & TRACE_STOPPED) {
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/* This child meets the pid test and is being traced.
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* Deliver a signal to the tracer, if any.
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*/
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@ -26,6 +26,7 @@
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#include <string.h>
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#include <machine/archtypes.h>
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#include <env.h>
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#include <assert.h>
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#include "mproc.h"
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#include "param.h"
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@ -484,6 +485,11 @@ static void handle_vfs_reply()
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break;
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case PM_UNPAUSE_REPLY:
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/* The target process must always be stopped while unpausing; otherwise
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* it could just end up pausing itself on a new call afterwards.
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*/
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assert(rmp->mp_flags & PROC_STOPPED);
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/* Process is now unpaused */
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rmp->mp_flags |= UNPAUSED;
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@ -76,15 +76,15 @@ EXTERN struct mproc {
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#define IN_USE 0x00001 /* set when 'mproc' slot in use */
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#define WAITING 0x00002 /* set by WAIT system call */
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#define ZOMBIE 0x00004 /* waiting for parent to issue WAIT call */
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#define PROC_STOPPED 0x00008 /* process is stopped in the kernel */
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#define ALARM_ON 0x00010 /* set when SIGALRM timer started */
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#define EXITING 0x00020 /* set by EXIT, process is now exiting */
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#define TOLD_PARENT 0x00040 /* parent wait() completed, ZOMBIE off */
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#define STOPPED 0x00080 /* set if process stopped for tracing */
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#define TRACE_STOPPED 0x00080 /* set if process stopped for tracing */
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#define SIGSUSPENDED 0x00100 /* set by SIGSUSPEND system call */
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#define REPLY 0x00200 /* set if a reply message is pending */
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#define VFS_CALL 0x00400 /* set if waiting for VFS (normal calls) */
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#define PM_SIG_PENDING 0x00800 /* process got a signal while waiting for VFS */
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#define UNPAUSED 0x01000 /* process is not in a blocking call */
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#define UNPAUSED 0x01000 /* VFS has replied to unpause request */
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#define PRIV_PROC 0x02000 /* system process, special privileges */
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#define PARTIAL_EXEC 0x04000 /* process got a new map but no content */
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#define TRACE_EXIT 0x08000 /* tracer is forcing this process to exit */
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@ -87,7 +87,7 @@ int do_settime(void);
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/* trace.c */
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int do_trace(void);
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void stop_proc(struct mproc *rmp, int sig_nr);
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void trace_stop(struct mproc *rmp, int sig_nr);
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/* utility.c */
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pid_t get_free_pid(void);
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@ -28,22 +28,25 @@
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#include <signal.h>
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#include <sys/resource.h>
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#include <string.h>
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#include <assert.h>
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#include "mproc.h"
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#include "param.h"
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static void unpause(struct mproc *rmp);
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static int unpause(struct mproc *rmp);
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static int sig_send(struct mproc *rmp, int signo);
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static void sig_proc_exit(struct mproc *rmp, int signo);
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/*===========================================================================*
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* do_sigaction *
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*===========================================================================*/
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int do_sigaction()
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int do_sigaction(void)
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{
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int r;
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struct sigaction svec;
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struct sigaction *svp;
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assert(!(mp->mp_flags & (PROC_STOPPED | VFS_CALL | UNPAUSED)));
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if (m_in.sig_nr == SIGKILL) return(OK);
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if (m_in.sig_nr < 1 || m_in.sig_nr >= _NSIG) return(EINVAL);
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@ -86,8 +89,10 @@ int do_sigaction()
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/*===========================================================================*
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* do_sigpending *
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*===========================================================================*/
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int do_sigpending()
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int do_sigpending(void)
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{
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assert(!(mp->mp_flags & (PROC_STOPPED | VFS_CALL | UNPAUSED)));
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mp->mp_reply.reply_mask = (long) mp->mp_sigpending;
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return OK;
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}
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@ -95,7 +100,7 @@ int do_sigpending()
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/*===========================================================================*
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* do_sigprocmask *
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*===========================================================================*/
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int do_sigprocmask()
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int do_sigprocmask(void)
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{
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/* Note that the library interface passes the actual mask in sigmask_set,
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* not a pointer to the mask, in order to save a copy. Similarly,
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@ -107,9 +112,10 @@ int do_sigprocmask()
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*
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* KILL and STOP can't be masked.
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*/
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int i;
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assert(!(mp->mp_flags & (PROC_STOPPED | VFS_CALL | UNPAUSED)));
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mp->mp_reply.reply_mask = (long) mp->mp_sigmask;
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switch (m_in.sig_how) {
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@ -150,8 +156,10 @@ int do_sigprocmask()
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/*===========================================================================*
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* do_sigsuspend *
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*===========================================================================*/
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int do_sigsuspend()
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int do_sigsuspend(void)
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{
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assert(!(mp->mp_flags & (PROC_STOPPED | VFS_CALL | UNPAUSED)));
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mp->mp_sigmask2 = mp->mp_sigmask; /* save the old mask */
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mp->mp_sigmask = (sigset_t) m_in.sig_set;
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sigdelset(&mp->mp_sigmask, SIGKILL);
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@ -164,14 +172,15 @@ int do_sigsuspend()
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/*===========================================================================*
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* do_sigreturn *
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*===========================================================================*/
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int do_sigreturn()
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int do_sigreturn(void)
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{
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/* A user signal handler is done. Restore context and check for
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* pending unblocked signals.
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*/
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int r;
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assert(!(mp->mp_flags & (PROC_STOPPED | VFS_CALL | UNPAUSED)));
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mp->mp_sigmask = (sigset_t) m_in.sig_set;
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sigdelset(&mp->mp_sigmask, SIGKILL);
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sigdelset(&mp->mp_sigmask, SIGSTOP);
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@ -184,7 +193,7 @@ int do_sigreturn()
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/*===========================================================================*
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* do_kill *
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*===========================================================================*/
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int do_kill()
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int do_kill(void)
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{
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/* Perform the kill(pid, signo) system call. */
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@ -194,7 +203,7 @@ int do_kill()
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/*===========================================================================*
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* do_srv_kill *
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*===========================================================================*/
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int do_srv_kill()
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int do_srv_kill(void)
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{
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/* Perform the srv_kill(pid, signo) system call. */
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@ -209,6 +218,72 @@ int do_srv_kill()
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return check_sig(m_in.pid, m_in.sig_nr, TRUE /* ksig */);
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}
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/*===========================================================================*
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* stop_proc *
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*===========================================================================*/
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static int stop_proc(struct mproc *rmp, int may_delay)
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{
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/* Try to stop the given process in the kernel. If successful, mark the process
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* as stopped and return TRUE. If the process is still busy sending a message,
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* the behavior depends on the 'may_delay' parameter. If set, the process will
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* be marked as having a delay call pending, and the function returns FALSE. If
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* not set, the caller already knows that the process has no delay call, and PM
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* will panic.
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*/
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int r;
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assert(!(rmp->mp_flags & (PROC_STOPPED | DELAY_CALL | UNPAUSED)));
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r = sys_delay_stop(rmp->mp_endpoint);
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/* If the process is still busy sending a message, the kernel will give us
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* EBUSY now and send a SIGSNDELAY to the process as soon as sending is done.
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*/
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switch (r) {
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case OK:
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rmp->mp_flags |= PROC_STOPPED;
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return TRUE;
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case EBUSY:
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if (!may_delay)
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panic("stop_proc: unexpected delay call");
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rmp->mp_flags |= DELAY_CALL;
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return FALSE;
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default:
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panic("sys_delay_stop failed: %d", r);
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}
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}
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/*===========================================================================*
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* try_resume_proc *
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*===========================================================================*/
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static void try_resume_proc(struct mproc *rmp)
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{
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/* Resume the given process if possible. */
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int r;
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assert(rmp->mp_flags & PROC_STOPPED);
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/* If the process is blocked on a VFS call, do not resume it now. Most likely * it will be unpausing, in which case the process must remain stopped.
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* Otherwise, it will still be resumed once the VFS call returns. If the
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* process has died, do not resume it either.
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*/
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if (rmp->mp_flags & (VFS_CALL | EXITING))
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return;
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if ((r = sys_resume(rmp->mp_endpoint)) != OK)
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panic("sys_resume failed: %d", r);
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/* Also unset the unpaused flag. We can safely assume that a stopped process
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* need only be unpaused once, but once it is resumed, all bets are off.
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*/
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rmp->mp_flags &= ~(PROC_STOPPED | UNPAUSED);
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}
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/*===========================================================================*
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* process_ksig *
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*===========================================================================*/
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@ -261,23 +336,30 @@ int process_ksig(endpoint_t proc_nr_e, int signo)
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* signal settings. The process may also have forked, exited etcetera.
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*/
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if (signo == SIGSNDELAY && (rmp->mp_flags & DELAY_CALL)) {
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/* When getting SIGSNDELAY, the process is stopped at least until the
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* receipt of the SIGSNDELAY signal is acknowledged to the kernel. The
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* process is not stopped on PROC_STOP in the kernel. However, now that
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* there is no longer a delay call, stop_proc() is guaranteed to
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* succeed immediately.
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*/
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rmp->mp_flags &= ~DELAY_CALL;
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/*
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* If the VFS_CALL flag is still set we have a process which is stopped
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* and we only need to wait for a reply from VFS. We are going to check
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* the pending signal then
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assert(!(rmp->mp_flags & PROC_STOPPED));
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/* If the delay call was to PM, it may have resulted in a VFS call. In
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* that case, we must wait with further signal processing until VFS has
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* replied. Stop the process.
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*/
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if (rmp->mp_flags & VFS_CALL)
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if (rmp->mp_flags & VFS_CALL) {
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stop_proc(rmp, FALSE /*may_delay*/);
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return OK;
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if (rmp->mp_flags & PM_SIG_PENDING)
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panic("process_ksig: bad process state");
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}
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/* Process as many normal signals as possible. */
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check_pending(rmp);
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if (rmp->mp_flags & DELAY_CALL)
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panic("process_ksig: multiple delay calls?");
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assert(!(rmp->mp_flags & DELAY_CALL));
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}
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/* See if the process is still alive */
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@ -311,7 +393,7 @@ int ksig; /* non-zero means signal comes from kernel */
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* context from the sigcontext structure.
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* If there is insufficient stack space, kill the process.
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*/
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int r, slot, badignore;
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int slot, badignore;
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slot = (int) (rmp - mproc);
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if ((rmp->mp_flags & (IN_USE | EXITING)) != IN_USE) {
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@ -326,8 +408,8 @@ int ksig; /* non-zero means signal comes from kernel */
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sigaddset(&rmp->mp_sigtrace, signo);
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if (!(rmp->mp_flags & STOPPED))
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stop_proc(rmp, signo); /* a signal causes it to stop */
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if (!(rmp->mp_flags & TRACE_STOPPED))
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trace_stop(rmp, signo); /* a signal causes it to stop */
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return;
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}
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@ -337,14 +419,20 @@ int ksig; /* non-zero means signal comes from kernel */
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if(ksig)
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sigaddset(&rmp->mp_ksigpending, signo);
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if (!(rmp->mp_flags & PM_SIG_PENDING)) {
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/* No delay calls: VFS_CALL implies the process called us. */
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if ((r = sys_stop(rmp->mp_endpoint)) != OK)
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panic("sys_stop failed: %d", r);
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rmp->mp_flags |= PM_SIG_PENDING;
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/* Process the signal once VFS replies. Stop the process in the
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* meantime, so that it cannot make another call after the VFS reply
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* comes in but before we look at its signals again. Since we always
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* stop the process to deliver signals during a VFS call, the
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* PROC_STOPPED flag doubles as an indicator in restart_sigs() that
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* signals must be rechecked after a VFS reply comes in.
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*/
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if (!(rmp->mp_flags & (PROC_STOPPED | DELAY_CALL))) {
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/* If a VFS call is ongoing and the process is not yet stopped,
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* the process must have made a call to PM. Therefore, there
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* can be no delay calls in this case.
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*/
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stop_proc(rmp, FALSE /*delay_call*/);
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}
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return;
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}
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@ -400,7 +488,7 @@ int ksig; /* non-zero means signal comes from kernel */
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return;
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}
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if ((rmp->mp_flags & STOPPED) && signo != SIGKILL) {
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if ((rmp->mp_flags & TRACE_STOPPED) && signo != SIGKILL) {
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/* If the process is stopped for a debugger, do not deliver any signals
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* (except SIGKILL) in order not to confuse the debugger. The signals
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* will be delivered using the check_pending() calls in do_trace().
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@ -415,10 +503,7 @@ int ksig; /* non-zero means signal comes from kernel */
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* applicable. This may involve a roundtrip to VFS, in which case we'll
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* have to check back later.
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*/
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if (!(rmp->mp_flags & UNPAUSED)) {
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unpause(rmp);
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if (!(rmp->mp_flags & UNPAUSED)) {
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if (!unpause(rmp)) {
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/* not yet unpaused; continue later */
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sigaddset(&rmp->mp_sigpending, signo);
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if(ksig)
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@ -426,7 +511,6 @@ int ksig; /* non-zero means signal comes from kernel */
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return;
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}
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}
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/* Then send the actual signal to the process, by setting up a signal
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* handler.
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@ -564,7 +648,6 @@ register struct mproc *rmp;
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* changed. At each such place, check_pending() should be called to
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* check for newly unblocked signals.
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*/
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int i;
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int ksig;
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@ -576,11 +659,17 @@ register struct mproc *rmp;
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|||
sigdelset(&rmp->mp_ksigpending, i);
|
||||
sig_proc(rmp, i, FALSE /*trace*/, ksig);
|
||||
|
||||
if (rmp->mp_flags & VFS_CALL)
|
||||
if (rmp->mp_flags & VFS_CALL) {
|
||||
/* Signals must be rechecked upon return from the new
|
||||
* VFS call, unless the process was killed. In both
|
||||
* cases, the process is stopped.
|
||||
*/
|
||||
assert(rmp->mp_flags & PROC_STOPPED);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*===========================================================================*
|
||||
* restart_sigs *
|
||||
|
|
@ -590,7 +679,6 @@ struct mproc *rmp;
|
|||
{
|
||||
/* VFS has replied to a request from us; do signal-related work.
|
||||
*/
|
||||
int r;
|
||||
|
||||
if (rmp->mp_flags & (VFS_CALL | EXITING)) return;
|
||||
|
||||
|
|
@ -598,29 +686,27 @@ struct mproc *rmp;
|
|||
/* Tracer requested exit with specific exit value */
|
||||
exit_proc(rmp, rmp->mp_exitstatus, FALSE /*dump_core*/);
|
||||
}
|
||||
else if (rmp->mp_flags & PM_SIG_PENDING) {
|
||||
else if (rmp->mp_flags & PROC_STOPPED) {
|
||||
/* If a signal arrives while we are performing a VFS call, the process
|
||||
* will always be stopped immediately. Thus, if the process is stopped
|
||||
* once the reply from VFS arrives, we might have to check signals.
|
||||
*/
|
||||
assert(!(rmp->mp_flags & DELAY_CALL));
|
||||
|
||||
/* We saved signal(s) for after finishing a VFS call. Deal with this.
|
||||
* PM_SIG_PENDING remains set to indicate the process is still stopped.
|
||||
* PROC_STOPPED remains set to indicate the process is still stopped.
|
||||
*/
|
||||
check_pending(rmp);
|
||||
|
||||
/* The process may now be VFS-blocked again, because a signal exited the
|
||||
* process or was caught. Restart the process only when this is NOT the
|
||||
* case.
|
||||
*/
|
||||
if (!(rmp->mp_flags & VFS_CALL)) {
|
||||
rmp->mp_flags &= ~(PM_SIG_PENDING | UNPAUSED);
|
||||
|
||||
if ((r = sys_resume(rmp->mp_endpoint)) != OK)
|
||||
panic("sys_resume failed: %d", r);
|
||||
}
|
||||
/* Resume the process now, unless there is a reason not to. */
|
||||
try_resume_proc(rmp);
|
||||
}
|
||||
}
|
||||
|
||||
/*===========================================================================*
|
||||
* unpause *
|
||||
*===========================================================================*/
|
||||
static void unpause(rmp)
|
||||
static int unpause(rmp)
|
||||
struct mproc *rmp; /* which process */
|
||||
{
|
||||
/* A signal is to be sent to a process. If that process is hanging on a
|
||||
|
|
@ -629,42 +715,37 @@ struct mproc *rmp; /* which process */
|
|||
* interruptible calls such as READs and WRITEs from pipes, ttys and the like.
|
||||
*/
|
||||
message m;
|
||||
int r;
|
||||
|
||||
/* If we're already waiting for a delayed call, don't do anything now. */
|
||||
assert(!(rmp->mp_flags & VFS_CALL));
|
||||
|
||||
/* If the UNPAUSED flag is set, VFS replied to an earlier unpause request. */
|
||||
if (rmp->mp_flags & UNPAUSED) {
|
||||
assert((rmp->mp_flags & (DELAY_CALL | PROC_STOPPED)) == PROC_STOPPED);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
/* If the process is already stopping, don't do anything now. */
|
||||
if (rmp->mp_flags & DELAY_CALL)
|
||||
return;
|
||||
return FALSE;
|
||||
|
||||
/* Check to see if process is hanging on a WAIT or SIGSUSPEND call. */
|
||||
if (rmp->mp_flags & (WAITING | SIGSUSPENDED)) {
|
||||
/* Stop process from running. No delay calls: it called us. */
|
||||
if ((r = sys_stop(rmp->mp_endpoint)) != OK)
|
||||
panic("sys_stop failed: %d", r);
|
||||
|
||||
rmp->mp_flags |= UNPAUSED;
|
||||
|
||||
/* We interrupt the actual call from sig_send() below. */
|
||||
return;
|
||||
}
|
||||
|
||||
/* Not paused in PM. Let VFS try to unpause the process. */
|
||||
if (!(rmp->mp_flags & PM_SIG_PENDING)) {
|
||||
/* Stop process from running. */
|
||||
r = sys_delay_stop(rmp->mp_endpoint);
|
||||
|
||||
/* If the process is still busy sending a message, the kernel will give
|
||||
* us EBUSY now and send a SIGSNDELAY to the process as soon as sending
|
||||
* is done.
|
||||
/* Stop the process from running. Do not interrupt the actual call yet.
|
||||
* sig_send() will interrupt the call and resume the process afterward.
|
||||
* No delay calls: we know for a fact that the process called us.
|
||||
*/
|
||||
if (r == EBUSY) {
|
||||
rmp->mp_flags |= DELAY_CALL;
|
||||
stop_proc(rmp, FALSE /*may_delay*/);
|
||||
|
||||
return;
|
||||
return TRUE;
|
||||
}
|
||||
else if (r != OK) panic("sys_stop failed: %d", r);
|
||||
|
||||
rmp->mp_flags |= PM_SIG_PENDING;
|
||||
}
|
||||
/* Not paused in PM. Let VFS try to unpause the process. The process needs to
|
||||
* be stopped for this. If it is not already stopped, try to stop it now. If
|
||||
* that does not succeed immediately, postpone signal delivery.
|
||||
*/
|
||||
if (!(rmp->mp_flags & PROC_STOPPED) && !stop_proc(rmp, TRUE /*may_delay*/))
|
||||
return FALSE;
|
||||
|
||||
m.m_type = PM_UNPAUSE;
|
||||
m.PM_PROC = rmp->mp_endpoint;
|
||||
|
|
@ -673,6 +754,8 @@ struct mproc *rmp; /* which process */
|
|||
|
||||
/* Also tell VM. */
|
||||
vm_notify_sig_wrapper(rmp->mp_endpoint);
|
||||
|
||||
return FALSE;
|
||||
}
|
||||
|
||||
/*===========================================================================*
|
||||
|
|
@ -688,8 +771,7 @@ int signo; /* signal to send to process (1 to _NSIG-1) */
|
|||
struct sigmsg sigmsg;
|
||||
int r, sigflags, slot;
|
||||
|
||||
if (!(rmp->mp_flags & UNPAUSED))
|
||||
panic("sig_send: process not unpaused");
|
||||
assert(rmp->mp_flags & PROC_STOPPED);
|
||||
|
||||
sigflags = rmp->mp_sigact[signo].sa_flags;
|
||||
slot = (int) (rmp - mproc);
|
||||
|
|
@ -718,8 +800,9 @@ int signo; /* signal to send to process (1 to _NSIG-1) */
|
|||
|
||||
/* Ask the kernel to deliver the signal */
|
||||
r = sys_sigsend(rmp->mp_endpoint, &sigmsg);
|
||||
/* sys_sigsend can fail legitimately with EFAULT or ENOMEM if
|
||||
* the process memory can't accomodate the signal handler.
|
||||
/* sys_sigsend can fail legitimately with EFAULT or ENOMEM if the process
|
||||
* memory can't accommodate the signal handler. The target process will be
|
||||
* killed in that case, so do not bother interrupting or resuming it.
|
||||
*/
|
||||
if(r == EFAULT || r == ENOMEM) {
|
||||
return(FALSE);
|
||||
|
|
@ -734,14 +817,22 @@ int signo; /* signal to send to process (1 to _NSIG-1) */
|
|||
rmp->mp_flags &= ~(WAITING | SIGSUSPENDED);
|
||||
|
||||
setreply(slot, EINTR);
|
||||
}
|
||||
|
||||
/* Was the process stopped just for this signal? Then resume it. */
|
||||
if ((rmp->mp_flags & (PM_SIG_PENDING | UNPAUSED)) == UNPAUSED) {
|
||||
rmp->mp_flags &= ~UNPAUSED;
|
||||
/* The process must just have been stopped by unpause(), which means
|
||||
* that the UNPAUSE flag is not set.
|
||||
*/
|
||||
assert(!(rmp->mp_flags & UNPAUSED));
|
||||
|
||||
if ((r = sys_resume(rmp->mp_endpoint)) != OK)
|
||||
panic("sys_resume failed: %d", r);
|
||||
try_resume_proc(rmp);
|
||||
|
||||
assert(!(rmp->mp_flags & PROC_STOPPED));
|
||||
} else {
|
||||
/* If the process was not suspended in PM, VFS must first have
|
||||
* confirmed that it has tried to unsuspend any blocking call. Thus, we
|
||||
* got here from restart_sigs() as part of handling PM_UNPAUSE_REPLY,
|
||||
* and restart_sigs() will resume the process later.
|
||||
*/
|
||||
assert(rmp->mp_flags & UNPAUSED);
|
||||
}
|
||||
|
||||
return(TRUE);
|
||||
|
|
|
|||
|
|
@ -42,7 +42,6 @@ int do_trace()
|
|||
register struct mproc *child;
|
||||
struct ptrace_range pr;
|
||||
int i, r, req;
|
||||
message m;
|
||||
|
||||
req = m_in.request;
|
||||
|
||||
|
|
@ -137,7 +136,7 @@ int do_trace()
|
|||
if ((child = find_proc(m_in.pid)) == NULL) return(ESRCH);
|
||||
if (child->mp_flags & EXITING) return(ESRCH);
|
||||
if (child->mp_tracer != who_p) return(ESRCH);
|
||||
if (!(child->mp_flags & STOPPED)) return(EBUSY);
|
||||
if (!(child->mp_flags & TRACE_STOPPED)) return(EBUSY);
|
||||
|
||||
switch (req) {
|
||||
case T_EXIT: /* exit */
|
||||
|
|
@ -202,7 +201,7 @@ int do_trace()
|
|||
}
|
||||
|
||||
/* Resume the child as if nothing ever happened. */
|
||||
child->mp_flags &= ~STOPPED;
|
||||
child->mp_flags &= ~TRACE_STOPPED;
|
||||
child->mp_trace_flags = 0;
|
||||
|
||||
check_pending(child);
|
||||
|
|
@ -229,7 +228,7 @@ int do_trace()
|
|||
}
|
||||
}
|
||||
|
||||
child->mp_flags &= ~STOPPED;
|
||||
child->mp_flags &= ~TRACE_STOPPED;
|
||||
|
||||
check_pending(child);
|
||||
|
||||
|
|
@ -243,9 +242,9 @@ int do_trace()
|
|||
}
|
||||
|
||||
/*===========================================================================*
|
||||
* stop_proc *
|
||||
* trace_stop *
|
||||
*===========================================================================*/
|
||||
void stop_proc(rmp, signo)
|
||||
void trace_stop(rmp, signo)
|
||||
register struct mproc *rmp;
|
||||
int signo;
|
||||
{
|
||||
|
|
@ -257,7 +256,7 @@ int signo;
|
|||
r = sys_trace(T_STOP, rmp->mp_endpoint, 0L, (long *) 0);
|
||||
if (r != OK) panic("sys_trace failed: %d", r);
|
||||
|
||||
rmp->mp_flags |= STOPPED;
|
||||
rmp->mp_flags |= TRACE_STOPPED;
|
||||
if (wait_test(rpmp, rmp)) {
|
||||
sigdelset(&rmp->mp_sigtrace, signo);
|
||||
|
||||
|
|
|
|||
|
|
@ -73,7 +73,7 @@ static void pid_psinfo(int i)
|
|||
if (!task) {
|
||||
if (is_zombie(i))
|
||||
state = STATE_ZOMBIE; /* zombie */
|
||||
else if (mproc[pi].mp_flags & STOPPED)
|
||||
else if (mproc[pi].mp_flags & TRACE_STOPPED)
|
||||
state = STATE_STOP; /* stopped (traced) */
|
||||
else if (proc[i].p_rts_flags == 0)
|
||||
state = STATE_RUN; /* in run-queue */
|
||||
|
|
|
|||
|
|
@ -57,7 +57,7 @@ MINIX_TESTS= \
|
|||
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 \
|
||||
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 \
|
||||
41 42 43 44 45 46 48 49 50 52 53 54 55 56 58 59 60 \
|
||||
61 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78
|
||||
61 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
|
||||
|
||||
.if ${MACHINE_ARCH} == "i386"
|
||||
MINIX_TESTS+= \
|
||||
|
|
|
|||
2
test/run
2
test/run
|
|
@ -28,7 +28,7 @@ rootscripts="testisofs testvnd"
|
|||
alltests="1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 \
|
||||
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 \
|
||||
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 \
|
||||
61 62 63 64 65 66 67 68 69 70 71 72 75 76 77 78 \
|
||||
61 62 63 64 65 66 67 68 69 70 71 72 75 76 77 78 79 \
|
||||
sh1 sh2 interp mfs isofs vnd"
|
||||
tests_no=`expr 0`
|
||||
|
||||
|
|
|
|||
497
test/test79.c
Normal file
497
test/test79.c
Normal file
|
|
@ -0,0 +1,497 @@
|
|||
/* Tests for PM signal handling robustness - by D.C. van Moolenbroek */
|
||||
/*
|
||||
* The signal handling code must not rely on priorities assigned to services,
|
||||
* and so, this test (like any test!) must also pass if PM and/or VFS are not
|
||||
* given a fixed high priority. A good way to verify this is to let PM and VFS
|
||||
* be scheduled by SCHED rather than KERNEL, and to give them the same priority
|
||||
* as (or slightly lower than) normal user processes. Note that if VFS is
|
||||
* configured to use a priority *far lower* than user processes, starvation may
|
||||
* cause this test not to complete in some scenarios. In that case, Ctrl+C
|
||||
* should still be able to kill the test.
|
||||
*/
|
||||
#include <stdlib.h>
|
||||
#include <stdio.h>
|
||||
#include <signal.h>
|
||||
#include <sys/wait.h>
|
||||
#include <sys/time.h>
|
||||
#include <sys/utsname.h>
|
||||
|
||||
#define ITERATIONS 1
|
||||
|
||||
#include "common.h"
|
||||
|
||||
#define NR_SIGNALS 20000
|
||||
|
||||
#define MAX_SIGNALERS 3
|
||||
|
||||
static const int signaler_sig[MAX_SIGNALERS] = { SIGUSR1, SIGUSR2, SIGHUP };
|
||||
static pid_t signaler_pid[MAX_SIGNALERS];
|
||||
static int sig_counter;
|
||||
|
||||
enum {
|
||||
JOB_RUN = 0,
|
||||
JOB_CALL_PM,
|
||||
JOB_CALL_VFS,
|
||||
JOB_SET_MASK,
|
||||
JOB_BLOCK_PM,
|
||||
JOB_BLOCK_VFS,
|
||||
JOB_CALL_PM_VFS,
|
||||
NR_JOBS
|
||||
};
|
||||
|
||||
#define OPT_NEST 0x1
|
||||
#define OPT_ALARM 0x2
|
||||
#define OPT_ALL 0x3
|
||||
|
||||
struct link {
|
||||
pid_t pid;
|
||||
int sndfd;
|
||||
int rcvfd;
|
||||
};
|
||||
|
||||
/*
|
||||
* Spawn a child process, with a pair of pipes to talk to it bidirectionally.
|
||||
*/
|
||||
static void
|
||||
spawn(struct link *link, void (*proc)(struct link *))
|
||||
{
|
||||
int up[2], dn[2];
|
||||
|
||||
fflush(stdout);
|
||||
fflush(stderr);
|
||||
|
||||
if (pipe(up) != 0) e(0);
|
||||
if (pipe(dn) != 0) e(0);
|
||||
|
||||
link->pid = fork();
|
||||
|
||||
switch (link->pid) {
|
||||
case 0:
|
||||
close(up[1]);
|
||||
close(dn[0]);
|
||||
|
||||
link->rcvfd = up[0];
|
||||
link->sndfd = dn[1];
|
||||
|
||||
errct = 0;
|
||||
|
||||
proc(link);
|
||||
|
||||
/* Close our pipe FDs on exit, so that we can make zombies. */
|
||||
exit(errct);
|
||||
case -1:
|
||||
e(0);
|
||||
break;
|
||||
}
|
||||
|
||||
close(up[0]);
|
||||
close(dn[1]);
|
||||
|
||||
link->sndfd = up[1];
|
||||
link->rcvfd = dn[0];
|
||||
}
|
||||
|
||||
/*
|
||||
* Wait for a child process to terminate, and clean up.
|
||||
*/
|
||||
static void
|
||||
collect(struct link *link)
|
||||
{
|
||||
int status;
|
||||
|
||||
close(link->sndfd);
|
||||
close(link->rcvfd);
|
||||
|
||||
if (waitpid(link->pid, &status, 0) <= 0) e(0);
|
||||
|
||||
if (!WIFEXITED(status)) e(0);
|
||||
else errct += WEXITSTATUS(status);
|
||||
}
|
||||
|
||||
/*
|
||||
* Forcibly terminate a child process, and clean up.
|
||||
*/
|
||||
static void
|
||||
terminate(struct link *link)
|
||||
{
|
||||
int status;
|
||||
|
||||
if (kill(link->pid, SIGKILL) != 0) e(0);
|
||||
|
||||
close(link->sndfd);
|
||||
close(link->rcvfd);
|
||||
|
||||
if (waitpid(link->pid, &status, 0) <= 0) e(0);
|
||||
|
||||
if (WIFSIGNALED(status)) {
|
||||
if (WTERMSIG(status) != SIGKILL) e(0);
|
||||
} else {
|
||||
if (!WIFEXITED(status)) e(0);
|
||||
else errct += WEXITSTATUS(status);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Send an integer value to the child or parent.
|
||||
*/
|
||||
static void
|
||||
snd(struct link *link, int val)
|
||||
{
|
||||
if (write(link->sndfd, (void *) &val, sizeof(val)) != sizeof(val))
|
||||
e(0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Receive an integer value from the child or parent, or -1 on EOF.
|
||||
*/
|
||||
static int
|
||||
rcv(struct link *link)
|
||||
{
|
||||
int r, val;
|
||||
|
||||
if ((r = read(link->rcvfd, (void *) &val, sizeof(val))) == 0)
|
||||
return -1;
|
||||
|
||||
if (r != sizeof(val)) e(0);
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
/*
|
||||
* Set a signal handler for a particular signal, blocking either all or no
|
||||
* signals when the signal handler is invoked.
|
||||
*/
|
||||
static void
|
||||
set_handler(int sig, void (*proc)(int), int block)
|
||||
{
|
||||
struct sigaction act;
|
||||
|
||||
memset(&act, 0, sizeof(act));
|
||||
if (block) sigfillset(&act.sa_mask);
|
||||
act.sa_handler = proc;
|
||||
|
||||
if (sigaction(sig, &act, NULL) != 0) e(0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Generic signal handler for the worker process.
|
||||
*/
|
||||
static void
|
||||
worker_handler(int sig)
|
||||
{
|
||||
int i;
|
||||
|
||||
switch (sig) {
|
||||
case SIGUSR1:
|
||||
case SIGUSR2:
|
||||
case SIGHUP:
|
||||
for (i = 0; i < MAX_SIGNALERS; i++) {
|
||||
if (signaler_sig[i] != sig) continue;
|
||||
|
||||
if (signaler_pid[i] == -1) e(0);
|
||||
else if (kill(signaler_pid[i], SIGUSR1) != 0) e(0);
|
||||
break;
|
||||
}
|
||||
if (i == MAX_SIGNALERS) e(0);
|
||||
break;
|
||||
case SIGTERM:
|
||||
exit(errct);
|
||||
break;
|
||||
case SIGALRM:
|
||||
/* Do nothing. */
|
||||
break;
|
||||
default:
|
||||
e(0);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Procedure for the worker process. Sets up its own environment using
|
||||
* information sent to it by the parent, sends an acknowledgement to the
|
||||
* parent, and loops executing the job given to it until a SIGTERM comes in.
|
||||
*/
|
||||
static void __dead
|
||||
worker_proc(struct link *parent)
|
||||
{
|
||||
struct utsname name;
|
||||
struct itimerval it;
|
||||
struct timeval tv;
|
||||
sigset_t set, oset;
|
||||
uid_t uid;
|
||||
int i, job, options;
|
||||
|
||||
job = rcv(parent);
|
||||
options = rcv(parent);
|
||||
|
||||
for (i = 0; i < MAX_SIGNALERS; i++) {
|
||||
set_handler(signaler_sig[i], worker_handler,
|
||||
!(options & OPT_NEST));
|
||||
|
||||
signaler_pid[i] = rcv(parent);
|
||||
}
|
||||
|
||||
set_handler(SIGTERM, worker_handler, 1 /* block */);
|
||||
set_handler(SIGALRM, worker_handler, !(options & OPT_NEST));
|
||||
|
||||
snd(parent, 0);
|
||||
|
||||
if (options & OPT_ALARM) {
|
||||
/* The timer would kill wimpy platforms such as ARM. */
|
||||
if (uname(&name) < 0) e(0);
|
||||
if (strcmp(name.machine, "arm")) {
|
||||
it.it_value.tv_sec = 0;
|
||||
it.it_value.tv_usec = 1;
|
||||
it.it_interval.tv_sec = 0;
|
||||
it.it_interval.tv_usec = 1;
|
||||
if (setitimer(ITIMER_REAL, &it, NULL) != 0) e(0);
|
||||
}
|
||||
}
|
||||
|
||||
switch (job) {
|
||||
case JOB_RUN:
|
||||
for (;;);
|
||||
break;
|
||||
case JOB_CALL_PM:
|
||||
/*
|
||||
* Part of the complication of the current system in PM comes
|
||||
* from the fact that when a process is being stopped, it might
|
||||
* already have started sending a message. That message will
|
||||
* arrive at its destination regardless of the process's run
|
||||
* state. PM must avoid setting up a signal handler (and
|
||||
* changing the process's signal mask as part of that) if such
|
||||
* a message is still in transit, because that message might,
|
||||
* for example, query (or even change) the signal mask.
|
||||
*/
|
||||
for (;;) {
|
||||
if (sigprocmask(SIG_BLOCK, NULL, &set) != 0) e(0);
|
||||
if (sigismember(&set, SIGUSR1)) e(0);
|
||||
}
|
||||
break;
|
||||
case JOB_CALL_VFS:
|
||||
for (;;) {
|
||||
tv.tv_sec = 0;
|
||||
tv.tv_usec = 0;
|
||||
select(0, NULL, NULL, NULL, &tv);
|
||||
}
|
||||
break;
|
||||
case JOB_SET_MASK:
|
||||
for (;;) {
|
||||
sigfillset(&set);
|
||||
if (sigprocmask(SIG_SETMASK, &set, &oset) != 0) e(0);
|
||||
if (sigprocmask(SIG_SETMASK, &oset, NULL) != 0) e(0);
|
||||
}
|
||||
break;
|
||||
case JOB_BLOCK_PM:
|
||||
for (;;) {
|
||||
sigemptyset(&set);
|
||||
sigsuspend(&set);
|
||||
}
|
||||
break;
|
||||
case JOB_BLOCK_VFS:
|
||||
for (;;)
|
||||
select(0, NULL, NULL, NULL, NULL);
|
||||
break;
|
||||
case JOB_CALL_PM_VFS:
|
||||
uid = getuid();
|
||||
for (;;)
|
||||
setuid(uid);
|
||||
default:
|
||||
e(0);
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Signal handler procedure for the signaler processes, counting the number of
|
||||
* signals received from the worker process.
|
||||
*/
|
||||
static void
|
||||
signaler_handler(int sig)
|
||||
{
|
||||
sig_counter++;
|
||||
}
|
||||
|
||||
/*
|
||||
* Procedure for the signaler processes. Gets the pid of the worker process
|
||||
* and the signal to use, and then repeatedly sends that signal to the worker
|
||||
* process, waiting for a SIGUSR1 signal back from the worker before
|
||||
* continuing. This signal ping-pong is repeated for a set number of times.
|
||||
*/
|
||||
static void
|
||||
signaler_proc(struct link *parent)
|
||||
{
|
||||
sigset_t set, oset;
|
||||
pid_t pid;
|
||||
int i, sig, nr;
|
||||
|
||||
pid = rcv(parent);
|
||||
sig = rcv(parent);
|
||||
nr = rcv(parent);
|
||||
sig_counter = 0;
|
||||
|
||||
sigfillset(&set);
|
||||
if (sigprocmask(SIG_SETMASK, &set, &oset) != 0) e(0);
|
||||
|
||||
set_handler(SIGUSR1, signaler_handler, 1 /*block*/);
|
||||
|
||||
for (i = 0; nr == 0 || i < nr; i++) {
|
||||
if (sig_counter != i) e(0);
|
||||
|
||||
if (kill(pid, sig) != 0 && nr > 0) e(0);
|
||||
|
||||
sigsuspend(&oset);
|
||||
}
|
||||
|
||||
if (sig_counter != nr) e(0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Set up the worker and signaler processes, wait for the signaler processes to
|
||||
* do their work and terminate, and then terminate the worker process.
|
||||
*/
|
||||
static void
|
||||
sub79a(int job, int signalers, int options)
|
||||
{
|
||||
struct link worker, signaler[MAX_SIGNALERS];
|
||||
int i;
|
||||
|
||||
spawn(&worker, worker_proc);
|
||||
|
||||
snd(&worker, job);
|
||||
snd(&worker, options);
|
||||
|
||||
for (i = 0; i < signalers; i++) {
|
||||
spawn(&signaler[i], signaler_proc);
|
||||
|
||||
snd(&worker, signaler[i].pid);
|
||||
}
|
||||
for (; i < MAX_SIGNALERS; i++)
|
||||
snd(&worker, -1);
|
||||
|
||||
if (rcv(&worker) != 0) e(0);
|
||||
|
||||
for (i = 0; i < signalers; i++) {
|
||||
snd(&signaler[i], worker.pid);
|
||||
snd(&signaler[i], signaler_sig[i]);
|
||||
snd(&signaler[i], NR_SIGNALS);
|
||||
}
|
||||
|
||||
for (i = 0; i < signalers; i++)
|
||||
collect(&signaler[i]);
|
||||
|
||||
if (kill(worker.pid, SIGTERM) != 0) e(0);
|
||||
|
||||
collect(&worker);
|
||||
}
|
||||
|
||||
/*
|
||||
* Stress test for signal handling. One worker process gets signals from up to
|
||||
* three signaler processes while performing one of a number of jobs. It
|
||||
* replies to each signal by signaling the source, thus creating a ping-pong
|
||||
* effect for each of the signaler processes. The signal ping-ponging is
|
||||
* supposed to be reliable, and the most important aspect of the test is that
|
||||
* no signals get lost. The test is performed a number of times, varying the
|
||||
* job executed by the worker process, the number of signalers, whether signals
|
||||
* are blocked while executing a signal handler in the worker, and whether the
|
||||
* worker process has a timer running at high frequency.
|
||||
*/
|
||||
static void
|
||||
test79a(void)
|
||||
{
|
||||
int job, signalers, options;
|
||||
|
||||
subtest = 1;
|
||||
|
||||
for (options = 0; options <= OPT_ALL; options++)
|
||||
for (signalers = 1; signalers <= MAX_SIGNALERS; signalers++)
|
||||
for (job = 0; job < NR_JOBS; job++)
|
||||
sub79a(job, signalers, options);
|
||||
}
|
||||
|
||||
/*
|
||||
* Set up the worker process and optionally a signaler process, wait for a
|
||||
* predetermined amount of time, and then kill all the child processes.
|
||||
*/
|
||||
static void
|
||||
sub79b(int job, int use_signaler, int options)
|
||||
{
|
||||
struct link worker, signaler;
|
||||
struct timeval tv;
|
||||
int i;
|
||||
|
||||
spawn(&worker, worker_proc);
|
||||
|
||||
snd(&worker, job);
|
||||
snd(&worker, options);
|
||||
|
||||
if ((i = use_signaler) != 0) {
|
||||
spawn(&signaler, signaler_proc);
|
||||
|
||||
snd(&worker, signaler.pid);
|
||||
}
|
||||
for (; i < MAX_SIGNALERS; i++)
|
||||
snd(&worker, -1);
|
||||
|
||||
if (rcv(&worker) != 0) e(0);
|
||||
|
||||
if (use_signaler) {
|
||||
snd(&signaler, worker.pid);
|
||||
snd(&signaler, signaler_sig[0]);
|
||||
snd(&signaler, 0);
|
||||
}
|
||||
|
||||
/* Use select() so that we can verify we don't get signals. */
|
||||
tv.tv_sec = 0;
|
||||
tv.tv_usec = 100000;
|
||||
if (select(0, NULL, NULL, NULL, &tv) != 0) e(0);
|
||||
|
||||
terminate(&worker);
|
||||
|
||||
if (use_signaler)
|
||||
terminate(&signaler);
|
||||
}
|
||||
|
||||
/*
|
||||
* This test is similar to the previous one, except that we now kill the worker
|
||||
* process after a while. This should trigger various process transitions to
|
||||
* the exiting state. Not much can be verified from this test program, but we
|
||||
* intend to trigger as many internal state verification statements of PM
|
||||
* itself as possible this way. A signaler process is optional in this test,
|
||||
* and if used, it will not stop after a predetermined number of signals.
|
||||
*/
|
||||
static void
|
||||
test79b(void)
|
||||
{
|
||||
int job, signalers, options;
|
||||
|
||||
subtest = 2;
|
||||
|
||||
for (options = 0; options <= OPT_ALL; options++)
|
||||
for (signalers = 0; signalers <= 1; signalers++)
|
||||
for (job = 0; job < NR_JOBS; job++)
|
||||
sub79b(job, signalers, options);
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
* PM signal handling robustness test program.
|
||||
*/
|
||||
int
|
||||
main(int argc, char **argv)
|
||||
{
|
||||
int i, m;
|
||||
|
||||
start(79);
|
||||
|
||||
if (argc == 2)
|
||||
m = atoi(argv[1]);
|
||||
else
|
||||
m = 0xFF;
|
||||
|
||||
for (i = 0; i < ITERATIONS; i++) {
|
||||
if (m & 0x01) test79a();
|
||||
if (m & 0x02) test79b();
|
||||
}
|
||||
|
||||
quit();
|
||||
}
|
||||
Loading…
Reference in a new issue