41e9fedf87
bugfixes: SYSTEM: . removed rc->p_priv->s_flags = 0; for the priv struct shared by all user processes in get_priv(). this should only be done once. doing a SYS_PRIV_USER in sys_privctl() caused the flags of all user processes to be reset, so they were no longer PREEMPTIBLE. this happened when RS executed a policy script. (this broke test1 in the test set) VFS/MFS: . chown can change the mode of a file, and chmod arguments are only part of the full file mode so the full filemode is slightly magic. changed these calls so that the final modes are returned to VFS, so that the vnode can be kept up-to-date. (this broke test11 in the test set) MFS: . lookup() checked for sizeof(string) instead of sizeof(user_path), truncating long path names (caught by test 23) . truncate functions neglected to update ctime (this broke test16) VFS: . corner case of an empty filename lookup caused fields of a request not to be filled in in the lookup functions, not making it clear that the lookup had failed, causing messages to garbage processes, causing strange failures. (caught by test 30) . trust v_size in vnode when doing reads or writes on non-special files, truncating i/o where necessary; this is necessary for pipes, as MFS can't tell when a pipe has been truncated without it being told explicitly each time. when the last reader/writer on a pipe closes, tell FS about the new size using truncate_vn(). (this broke test 25, among others) . permission check for chdir() had disappeared; added a forbidden() call (caught by test 23) new code, shouldn't change anything: . introduced RTS_SET, RTS_UNSET, and RTS_ISSET macro's, and their LOCK variants. These macros set and clear the p_rts_flags field, causing a lot of duplicated logic like old_flags = rp->p_rts_flags; /* save value of the flags */ rp->p_rts_flags &= ~NO_PRIV; if (old_flags != 0 && rp->p_rts_flags == 0) lock_enqueue(rp); to change into the simpler RTS_LOCK_UNSET(rp, NO_PRIV); so the macros take care of calling dequeue() and enqueue() (or lock_*()), as the case may be). This makes the code a bit more readable and a bit less fragile. . removed return code from do_clocktick in CLOCK as it currently never replies . removed some debug code from VFS . fixed grant debug message in device.c preemptive checks, tests, changes: . added return code checks of receive() to SYSTEM and CLOCK . O_TRUNC should never arrive at MFS (added sanity check and removed O_TRUNC code) . user_path declared with PATH_MAX+1 to let it be null-terminated . checks in MFS to see if strings passed by VFS are null-terminated IS: . static irq name table thrown out
58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/* The kernel call implemented in this file:
|
|
* m_type: SYS_EXEC
|
|
*
|
|
* The parameters for this kernel call are:
|
|
* m1_i1: PR_ENDPT (process that did exec call)
|
|
* m1_p1: PR_STACK_PTR (new stack pointer)
|
|
* m1_p2: PR_NAME_PTR (pointer to program name)
|
|
* m1_p3: PR_IP_PTR (new instruction pointer)
|
|
*/
|
|
#include "../system.h"
|
|
#include <string.h>
|
|
#include <signal.h>
|
|
#include <minix/endpoint.h>
|
|
|
|
#if USE_EXEC
|
|
|
|
/*===========================================================================*
|
|
* do_exec *
|
|
*===========================================================================*/
|
|
PUBLIC int do_exec(m_ptr)
|
|
register message *m_ptr; /* pointer to request message */
|
|
{
|
|
/* Handle sys_exec(). A process has done a successful EXEC. Patch it up. */
|
|
register struct proc *rp;
|
|
reg_t sp; /* new sp */
|
|
phys_bytes phys_name;
|
|
char *np;
|
|
int proc;
|
|
|
|
if(!isokendpt(m_ptr->PR_ENDPT, &proc))
|
|
return EINVAL;
|
|
|
|
rp = proc_addr(proc);
|
|
sp = (reg_t) m_ptr->PR_STACK_PTR;
|
|
rp->p_reg.sp = sp; /* set the stack pointer */
|
|
|
|
#if (_MINIX_CHIP == _CHIP_INTEL)
|
|
/* wipe extra LDT entries */
|
|
phys_memset(vir2phys(&rp->p_seg.p_ldt[EXTRA_LDT_INDEX]), 0,
|
|
(LDT_SIZE - EXTRA_LDT_INDEX) * sizeof(rp->p_seg.p_ldt[0]));
|
|
#endif
|
|
rp->p_reg.pc = (reg_t) m_ptr->PR_IP_PTR; /* set pc */
|
|
RTS_LOCK_UNSET(rp, RECEIVING); /* PM does not reply to EXEC call */
|
|
/* Save command name for debugging, ps(1) output, etc. */
|
|
phys_name = numap_local(who_p, (vir_bytes) m_ptr->PR_NAME_PTR,
|
|
(vir_bytes) P_NAME_LEN - 1);
|
|
if (phys_name != 0) {
|
|
phys_copy(phys_name, vir2phys(rp->p_name), (phys_bytes) P_NAME_LEN - 1);
|
|
for (np = rp->p_name; (*np & BYTE) >= ' '; np++) {}
|
|
*np = 0; /* mark end */
|
|
} else {
|
|
strncpy(rp->p_name, "<unset>", P_NAME_LEN);
|
|
}
|
|
|
|
return(OK);
|
|
}
|
|
#endif /* USE_EXEC */
|
|
|