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Proc locking.

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This commit is contained in:
jhb 2001-03-07 03:27:32 +00:00
parent 4d5490f460
commit f307208ba9
1 changed files with 9 additions and 3 deletions
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12
sys/kern/kern_exec.c
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@ -266,13 +266,12 @@ execve(p, uap)
* mark as execed, wakeup the process that vforked (if any) and tell
* it that it now has its own resources back
*/
PROC_LOCK(p);
p->p_flag |= P_EXEC;
PROCTREE_LOCK(PT_SHARED);
if (p->p_pptr && (p->p_flag & P_PPWAIT)) {
p->p_flag &= ~P_PPWAIT;
wakeup((caddr_t)p->p_pptr);
}
PROCTREE_LOCK(PT_RELEASE);
/*
* Implement image setuid/setgid.
@ -284,6 +283,7 @@ execve(p, uap)
((attr.va_mode & VSGID) && p->p_ucred->cr_gid != attr.va_gid)) &&
(imgp->vp->v_mount->mnt_flag & MNT_NOSUID) == 0 &&
(p->p_flag & P_TRACED) == 0) {
PROC_UNLOCK(p);
/*
* Turn off syscall tracing for set-id programs, except for
* root.
@ -307,6 +307,7 @@ execve(p, uap)
if (p->p_ucred->cr_uid == p->p_cred->p_ruid &&
p->p_ucred->cr_gid == p->p_cred->p_rgid)
p->p_flag &= ~P_SUGID;
PROC_UNLOCK(p);
}
/*
@ -326,13 +327,14 @@ execve(p, uap)
/*
* notify others that we exec'd
*/
PROC_LOCK(p);
KNOTE(&p->p_klist, NOTE_EXEC);
/*
* If tracing the process, trap to debugger so breakpoints
* can be set before the program executes.
*/
STOPEVENT(p, S_EXEC, 0);
_STOPEVENT(p, S_EXEC, 0);
if (p->p_flag & P_TRACED)
psignal(p, SIGTRAP);
@ -352,12 +354,16 @@ execve(p, uap)
/* Cache arguments if they fit inside our allowance */
i = imgp->endargs - imgp->stringbase;
if (ps_arg_cache_limit >= i + sizeof(struct pargs)) {
PROC_UNLOCK(p);
MALLOC(p->p_args, struct pargs *, sizeof(struct pargs) + i,
M_PARGS, M_WAITOK);
KASSERT(p->p_args != NULL, ("malloc of p_args failed"));
PROC_LOCK(p);
p->p_args->ar_ref = 1;
p->p_args->ar_length = i;
bcopy(imgp->stringbase, p->p_args->ar_args, i);
}
PROC_UNLOCK(p);
exec_fail_dealloc: