6f374faca5
This patch provides basic protection against damage resulting from differently compiled servers blindly copying tables to one another. In every getsysinfo() call, the caller is provided with the expected size of the requested data structure. The callee fails the call if the expected size does not match the data structure's actual size.
659 lines
18 KiB
C
659 lines
18 KiB
C
/* This file contains a collection of miscellaneous procedures. Some of them
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* perform simple system calls. Some others do a little part of system calls
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* that are mostly performed by the Memory Manager.
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*
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* The entry points into this file are
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* do_dup: perform the DUP system call
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* do_fcntl: perform the FCNTL system call
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* do_sync: perform the SYNC system call
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* do_fsync: perform the FSYNC system call
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* do_reboot: sync disks and prepare for shutdown
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* pm_fork: adjust the tables after PM has performed a FORK system call
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* do_exec: handle files with FD_CLOEXEC on after PM has done an EXEC
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* do_exit: a process has exited; note that in the tables
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* do_set: set uid or gid for some process
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* do_revive: revive a process that was waiting for something (e.g. TTY)
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* do_svrctl: file system control
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* do_getsysinfo: request copy of FS data structure
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* pm_dumpcore: create a core dump
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*/
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#include "fs.h"
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#include <fcntl.h>
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#include <assert.h>
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#include <unistd.h>
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#include <string.h>
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#include <minix/callnr.h>
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#include <minix/safecopies.h>
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#include <minix/endpoint.h>
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#include <minix/com.h>
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#include <minix/sysinfo.h>
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#include <minix/u64.h>
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#include <sys/ptrace.h>
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#include <sys/svrctl.h>
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#include "file.h"
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#include "fproc.h"
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#include "param.h"
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#include <minix/vfsif.h>
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#include "vnode.h"
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#include "vmnt.h"
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#define CORE_NAME "core"
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#define CORE_MODE 0777 /* mode to use on core image files */
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#if ENABLE_SYSCALL_STATS
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PUBLIC unsigned long calls_stats[NCALLS];
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#endif
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FORWARD _PROTOTYPE( void free_proc, (struct fproc *freed, int flags) );
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FORWARD _PROTOTYPE( void unmount_all, (void) );
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/*
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FORWARD _PROTOTYPE( int dumpcore, (int proc_e, struct mem_map *seg_ptr) );
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FORWARD _PROTOTYPE( int write_bytes, (struct inode *rip, off_t off,
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char *buf, size_t bytes) );
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FORWARD _PROTOTYPE( int write_seg, (struct inode *rip, off_t off, int proc_e,
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int seg, off_t seg_off, phys_bytes seg_bytes) );
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*/
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#define FP_EXITING 1
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/*===========================================================================*
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* do_getsysinfo *
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*===========================================================================*/
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PUBLIC int do_getsysinfo()
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{
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vir_bytes src_addr, dst_addr;
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size_t len;
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/* Only su may call do_getsysinfo. This call may leak information (and is not
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* stable enough to be part of the API/ABI). In the future, requests from
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* non-system processes should be denied.
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*/
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if (!super_user) return(EPERM);
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switch(m_in.SI_WHAT) {
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case SI_PROC_TAB:
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src_addr = (vir_bytes) fproc;
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len = sizeof(struct fproc) * NR_PROCS;
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break;
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case SI_DMAP_TAB:
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src_addr = (vir_bytes) dmap;
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len = sizeof(struct dmap) * NR_DEVICES;
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break;
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#if ENABLE_SYSCALL_STATS
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case SI_CALL_STATS:
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src_addr = (vir_bytes) calls_stats;
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len = sizeof(calls_stats);
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break;
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#endif
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default:
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return(EINVAL);
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}
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if (len != m_in.SI_SIZE)
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return(EINVAL);
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dst_addr = (vir_bytes) m_in.SI_WHERE;
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return sys_datacopy(SELF, src_addr, who_e, dst_addr, len);
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}
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/*===========================================================================*
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* do_dup *
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*===========================================================================*/
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PUBLIC int do_dup()
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{
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/* Perform the dup(fd) or dup2(fd,fd2) system call. These system calls are
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* obsolete. In fact, it is not even possible to invoke them using the
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* current library because the library routines call fcntl(). They are
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* provided to permit old binary programs to continue to run.
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*/
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register int rfd;
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register struct filp *f;
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struct filp *dummy;
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int r;
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/* Is the file descriptor valid? */
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rfd = m_in.fd & ~DUP_MASK; /* kill off dup2 bit, if on */
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if ((f = get_filp(rfd)) == NULL) return(err_code);
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/* Distinguish between dup and dup2. */
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if (m_in.fd == rfd) { /* bit not on */
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/* dup(fd) */
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if ((r = get_fd(0, 0, &m_in.fd2, &dummy)) != OK) return(r);
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} else {
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/* dup2(fd, fd2) */
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if (m_in.fd2 < 0 || m_in.fd2 >= OPEN_MAX) return(EBADF);
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if (rfd == m_in.fd2) return(m_in.fd2); /* ignore the call: dup2(x, x) */
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m_in.fd = m_in.fd2; /* prepare to close fd2 */
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(void) do_close(); /* cannot fail */
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}
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/* Success. Set up new file descriptors. */
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f->filp_count++;
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fp->fp_filp[m_in.fd2] = f;
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FD_SET(m_in.fd2, &fp->fp_filp_inuse);
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return(m_in.fd2);
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}
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/*===========================================================================*
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* do_fcntl *
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*===========================================================================*/
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PUBLIC int do_fcntl()
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{
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/* Perform the fcntl(fd, request, ...) system call. */
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register struct filp *f;
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int new_fd, r, fl;
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struct filp *dummy;
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/* Is the file descriptor valid? */
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if ((f = get_filp(m_in.fd)) == NULL) return(err_code);
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switch (m_in.request) {
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case F_DUPFD:
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/* This replaces the old dup() system call. */
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if (m_in.addr < 0 || m_in.addr >= OPEN_MAX) return(EINVAL);
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if ((r = get_fd(m_in.addr, 0, &new_fd, &dummy)) != OK) return(r);
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f->filp_count++;
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fp->fp_filp[new_fd] = f;
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return(new_fd);
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case F_GETFD:
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/* Get close-on-exec flag (FD_CLOEXEC in POSIX Table 6-2). */
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return( FD_ISSET(m_in.fd, &fp->fp_cloexec_set) ? FD_CLOEXEC : 0);
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case F_SETFD:
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/* Set close-on-exec flag (FD_CLOEXEC in POSIX Table 6-2). */
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if(m_in.addr & FD_CLOEXEC)
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FD_SET(m_in.fd, &fp->fp_cloexec_set);
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else
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FD_CLR(m_in.fd, &fp->fp_cloexec_set);
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return(OK);
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case F_GETFL:
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/* Get file status flags (O_NONBLOCK and O_APPEND). */
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fl = f->filp_flags & (O_NONBLOCK | O_APPEND | O_ACCMODE);
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return(fl);
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case F_SETFL:
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/* Set file status flags (O_NONBLOCK and O_APPEND). */
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fl = O_NONBLOCK | O_APPEND | O_REOPEN;
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f->filp_flags = (f->filp_flags & ~fl) | (m_in.addr & fl);
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return(OK);
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case F_GETLK:
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case F_SETLK:
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case F_SETLKW:
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/* Set or clear a file lock. */
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r = lock_op(f, m_in.request);
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return(r);
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case F_FREESP:
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{
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/* Free a section of a file. Preparation is done here, actual freeing
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* in freesp_inode().
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*/
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off_t start, end;
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struct flock flock_arg;
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signed long offset;
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/* Check if it's a regular file. */
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if((f->filp_vno->v_mode & I_TYPE) != I_REGULAR) return(EINVAL);
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if (!(f->filp_mode & W_BIT)) return(EBADF);
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/* Copy flock data from userspace. */
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if((r = sys_datacopy(who_e, (vir_bytes) m_in.name1, SELF,
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(vir_bytes) &flock_arg, (phys_bytes) sizeof(flock_arg))) != OK)
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return(r);
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/* Convert starting offset to signed. */
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offset = (signed long) flock_arg.l_start;
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/* Figure out starting position base. */
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switch(flock_arg.l_whence) {
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case SEEK_SET: start = 0; break;
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case SEEK_CUR:
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if (ex64hi(f->filp_pos) != 0)
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panic("do_fcntl: position in file too high");
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start = ex64lo(f->filp_pos);
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break;
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case SEEK_END: start = f->filp_vno->v_size; break;
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default: return EINVAL;
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}
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/* Check for overflow or underflow. */
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if(offset > 0 && start + offset < start) return EINVAL;
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if(offset < 0 && start + offset > start) return EINVAL;
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start += offset;
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if(start < 0) return EINVAL;
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if(flock_arg.l_len != 0) {
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if(start >= f->filp_vno->v_size) return EINVAL;
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end = start + flock_arg.l_len;
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if(end <= start) return EINVAL;
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if(end > f->filp_vno->v_size) end = f->filp_vno->v_size;
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} else {
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end = 0;
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}
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r = req_ftrunc(f->filp_vno->v_fs_e, f->filp_vno->v_inode_nr, start,
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end);
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if(r == OK && flock_arg.l_len == 0)
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f->filp_vno->v_size = start;
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return(r);
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}
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default:
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return(EINVAL);
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}
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}
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/*===========================================================================*
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* do_sync *
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*===========================================================================*/
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PUBLIC int do_sync()
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{
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struct vmnt *vmp;
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for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; ++vmp)
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if (vmp->m_dev != NO_DEV)
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req_sync(vmp->m_fs_e);
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return(OK);
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}
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/*===========================================================================*
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* do_fsync *
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*===========================================================================*/
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PUBLIC int do_fsync()
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{
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/* Perform the fsync() system call. For now, don't be unnecessarily smart. */
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do_sync();
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return(OK);
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}
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/*===========================================================================*
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* unmount_all *
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*===========================================================================*/
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PRIVATE void unmount_all(void)
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{
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/* Unmount all filesystems. File systems are mounted on other file systems,
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* so you have to pull off the loose bits repeatedly to get it all undone.
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*/
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int i;
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for (i= 0; i < NR_MNTS; i++) {
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struct vmnt *vmp;
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/* Unmount at least one. */
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for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; vmp++) {
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if (vmp->m_dev != NO_DEV)
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unmount(vmp->m_dev, NULL);
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}
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}
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}
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/*===========================================================================*
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* pm_reboot *
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*===========================================================================*/
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PUBLIC void pm_reboot()
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{
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/* Perform the FS side of the reboot call. */
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int i;
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do_sync();
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SANITYCHECK;
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/* Do exit processing for all leftover processes and servers,
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* but don't actually exit them (if they were really gone, PM
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* will tell us about it).
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*/
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for (i = 0; i < NR_PROCS; i++)
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if((m_in.endpt1 = fproc[i].fp_endpoint) != NONE) {
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/* No FP_EXITING, just free the resources, otherwise
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* consistency check for fp_endpoint (set to NONE) will
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* fail if process wants to do something in the (short)
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* future.
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*/
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free_proc(&fproc[i], 0);
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}
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SANITYCHECK;
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unmount_all();
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SANITYCHECK;
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}
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/*===========================================================================*
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* pm_fork *
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*===========================================================================*/
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PUBLIC void pm_fork(pproc, cproc, cpid)
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int pproc; /* Parent process */
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int cproc; /* Child process */
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int cpid; /* Child process id */
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{
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/* Perform those aspects of the fork() system call that relate to files.
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* In particular, let the child inherit its parent's file descriptors.
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* The parent and child parameters tell who forked off whom. The file
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* system uses the same slot numbers as the kernel. Only PM makes this call.
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*/
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register struct fproc *cp;
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int i, parentno, childno;
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/* Check up-to-dateness of fproc. */
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okendpt(pproc, &parentno);
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/* PM gives child endpoint, which implies process slot information.
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* Don't call isokendpt, because that will verify if the endpoint
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* number is correct in fproc, which it won't be.
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*/
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childno = _ENDPOINT_P(cproc);
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if(childno < 0 || childno >= NR_PROCS)
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panic("FS: bogus child for forking: %d", m_in.child_endpt);
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if(fproc[childno].fp_pid != PID_FREE)
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panic("FS: forking on top of in-use child: %d", childno);
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/* Copy the parent's fproc struct to the child. */
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fproc[childno] = fproc[parentno];
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/* Increase the counters in the 'filp' table. */
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cp = &fproc[childno];
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fp = &fproc[parentno];
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for (i = 0; i < OPEN_MAX; i++)
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if (cp->fp_filp[i] != NULL) cp->fp_filp[i]->filp_count++;
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/* Fill in new process and endpoint id. */
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cp->fp_pid = cpid;
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cp->fp_endpoint = cproc;
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/* A forking process never has an outstanding grant,
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* as it isn't blocking on i/o.
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*/
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if(GRANT_VALID(fp->fp_grant)) {
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printf("vfs: fork: fp (endpoint %d) has grant %d\n", fp->fp_endpoint, fp->fp_grant);
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panic("fp contains valid grant");
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}
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if(GRANT_VALID(cp->fp_grant)) {
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printf("vfs: fork: cp (endpoint %d) has grant %d\n", cp->fp_endpoint, cp->fp_grant);
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panic("cp contains valid grant");
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}
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/* A child is not a process leader. */
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cp->fp_sesldr = 0;
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/* This child has not exec()ced yet. */
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cp->fp_execced = 0;
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/* Record the fact that both root and working dir have another user. */
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if(cp->fp_rd) dup_vnode(cp->fp_rd);
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if(cp->fp_wd) dup_vnode(cp->fp_wd);
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}
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/*===========================================================================*
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* free_proc *
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*===========================================================================*/
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PRIVATE void free_proc(struct fproc *exiter, int flags)
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{
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int i;
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register struct fproc *rfp;
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register struct filp *rfilp;
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register struct vnode *vp;
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dev_t dev;
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SANITYCHECK;
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fp = exiter; /* get_filp() needs 'fp' */
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if(fp->fp_endpoint == NONE) {
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panic("free_proc: already free");
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}
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if (fp_is_blocked(fp)) {
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SANITYCHECK;
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unpause(fp->fp_endpoint);
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SANITYCHECK;
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}
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SANITYCHECK;
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/* Loop on file descriptors, closing any that are open. */
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for (i = 0; i < OPEN_MAX; i++) {
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(void) close_fd(fp, i);
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}
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/* Check if any process is SUSPENDed on this driver.
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* If a driver exits, unmap its entries in the dmap table.
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* (unmapping has to be done after the first step, because the
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* dmap table is used in the first step.)
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*/
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unsuspend_by_endpt(fp->fp_endpoint);
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/* Release root and working directories. */
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if(fp->fp_rd) { put_vnode(fp->fp_rd); fp->fp_rd = NULL; }
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if(fp->fp_wd) { put_vnode(fp->fp_wd); fp->fp_wd = NULL; }
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/* The rest of these actions is only done when processes actually
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* exit.
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*/
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if(!(flags & FP_EXITING)) {
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SANITYCHECK;
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return;
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}
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/* Invalidate endpoint number for error and sanity checks. */
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fp->fp_endpoint = NONE;
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/* If a session leader exits and it has a controlling tty, then revoke
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* access to its controlling tty from all other processes using it.
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*/
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if (fp->fp_sesldr && fp->fp_tty != 0) {
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dev = fp->fp_tty;
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for (rfp = &fproc[0]; rfp < &fproc[NR_PROCS]; rfp++) {
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if(rfp->fp_pid == PID_FREE) continue;
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if (rfp->fp_tty == dev) rfp->fp_tty = 0;
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for (i = 0; i < OPEN_MAX; i++) {
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if ((rfilp = rfp->fp_filp[i]) == NULL) continue;
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if (rfilp->filp_mode == FILP_CLOSED) continue;
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vp = rfilp->filp_vno;
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if ((vp->v_mode & I_TYPE) != I_CHAR_SPECIAL) continue;
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if ((dev_t) vp->v_sdev != dev) continue;
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(void) dev_close(dev, rfilp-filp);
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/* Ignore any errors, even SUSPEND. */
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rfilp->filp_mode = FILP_CLOSED;
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}
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}
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}
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/* Exit done. Mark slot as free. */
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fp->fp_pid = PID_FREE;
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SANITYCHECK;
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}
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/*===========================================================================*
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* pm_exit *
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*===========================================================================*/
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PUBLIC void pm_exit(proc)
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int proc;
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{
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int exitee_p;
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/* Perform the file system portion of the exit(status) system call. */
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/* Nevertheless, pretend that the call came from the user. */
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okendpt(proc, &exitee_p);
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free_proc(&fproc[exitee_p], FP_EXITING);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* pm_setgid *
|
|
*===========================================================================*/
|
|
PUBLIC void pm_setgid(proc_e, egid, rgid)
|
|
int proc_e;
|
|
int egid;
|
|
int rgid;
|
|
{
|
|
register struct fproc *tfp;
|
|
int slot;
|
|
|
|
okendpt(proc_e, &slot);
|
|
tfp = &fproc[slot];
|
|
|
|
tfp->fp_effgid = egid;
|
|
tfp->fp_realgid = rgid;
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* pm_setgroups *
|
|
*===========================================================================*/
|
|
PUBLIC void pm_setgroups(proc_e, ngroups, groups)
|
|
int proc_e;
|
|
int ngroups;
|
|
gid_t *groups;
|
|
{
|
|
struct fproc *rfp;
|
|
int slot;
|
|
|
|
okendpt(proc_e, &slot);
|
|
rfp = &fproc[slot];
|
|
if (ngroups * sizeof(gid_t) > sizeof(rfp->fp_sgroups))
|
|
panic("VFS: pm_setgroups: too much data to copy");
|
|
if(sys_datacopy(who_e, (vir_bytes) groups, SELF, (vir_bytes) rfp->fp_sgroups,
|
|
ngroups * sizeof(gid_t)) == OK) {
|
|
rfp->fp_ngroups = ngroups;
|
|
} else
|
|
panic("VFS: pm_setgroups: datacopy failed");
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* pm_setuid *
|
|
*===========================================================================*/
|
|
PUBLIC void pm_setuid(proc_e, euid, ruid)
|
|
int proc_e;
|
|
int euid;
|
|
int ruid;
|
|
{
|
|
register struct fproc *tfp;
|
|
int slot;
|
|
|
|
okendpt(proc_e, &slot);
|
|
tfp = &fproc[slot];
|
|
|
|
tfp->fp_effuid = euid;
|
|
tfp->fp_realuid = ruid;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_svrctl *
|
|
*===========================================================================*/
|
|
PUBLIC int do_svrctl()
|
|
{
|
|
switch (m_in.svrctl_req) {
|
|
/* No control request implemented yet. */
|
|
default:
|
|
return(EINVAL);
|
|
}
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* pm_dumpcore *
|
|
*===========================================================================*/
|
|
PUBLIC int pm_dumpcore(proc_e, csig, exe_name)
|
|
int proc_e;
|
|
int csig;
|
|
char *exe_name;
|
|
{
|
|
int proc_s, r, old_who_e;
|
|
int traced_proc_e = m_in.PM_TRACED_PROC;
|
|
|
|
okendpt(traced_proc_e, &proc_s);
|
|
fp = &fproc[proc_s];
|
|
|
|
/* Open the core file */
|
|
sprintf(user_fullpath, "%s.%d", CORE_NAME, fproc[proc_s].fp_pid);
|
|
r = common_open(O_WRONLY | O_CREAT | O_TRUNC, CORE_MODE);
|
|
if (r < 0) {
|
|
printf("VFS: Cannot open file to dump core\n");
|
|
return r;
|
|
}
|
|
|
|
old_who_e = who_e;
|
|
who_e = VFS_PROC_NR;
|
|
|
|
/* Write the core file in ELF format */
|
|
write_elf_core_file(csig, exe_name);
|
|
|
|
/* Close file */
|
|
close_fd(fp, r);
|
|
|
|
/* Terminate the process */
|
|
if (traced_proc_e == proc_e)
|
|
free_proc(&fproc[proc_s], FP_EXITING);
|
|
|
|
/* Restore the important variables that have been overwritten */
|
|
m_in.PM_PROC = proc_e;
|
|
m_in.PM_TRACED_PROC = traced_proc_e;
|
|
who_e = old_who_e;
|
|
|
|
return OK;
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* ds_event *
|
|
*===========================================================================*/
|
|
PUBLIC void ds_event(void)
|
|
{
|
|
char key[DS_MAX_KEYLEN];
|
|
char *blkdrv_prefix = "drv.blk.";
|
|
char *chrdrv_prefix = "drv.chr.";
|
|
u32_t value;
|
|
int type;
|
|
endpoint_t owner_endpoint;
|
|
int r, is_blk;
|
|
|
|
/* Get the event and the owner from DS. */
|
|
r = ds_check(key, &type, &owner_endpoint);
|
|
if(r != OK) {
|
|
if(r != ENOENT)
|
|
printf("vfs: ds_event: ds_check failed: %d\n", r);
|
|
return;
|
|
}
|
|
|
|
/* Only check for block and character driver up events. */
|
|
if (!strncmp(key, blkdrv_prefix, strlen(blkdrv_prefix))) {
|
|
is_blk = TRUE;
|
|
} else if (!strncmp(key, chrdrv_prefix, strlen(chrdrv_prefix))) {
|
|
is_blk = FALSE;
|
|
} else {
|
|
return; /* neither block nor character driver */
|
|
}
|
|
|
|
r = ds_retrieve_u32(key, &value);
|
|
if(r != OK) {
|
|
printf("vfs: ds_event: ds_retrieve_u32 failed\n");
|
|
return;
|
|
}
|
|
if (value != DS_DRIVER_UP) return;
|
|
|
|
/* Perform up. */
|
|
dmap_endpt_up(owner_endpoint, is_blk);
|
|
}
|
|
|