diff options
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 38 |
1 files changed, 36 insertions, 2 deletions
diff --git a/fs/exec.c b/fs/exec.c index eef86f55c0cb2f..0bdbf8710d6239 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1209,6 +1209,35 @@ void format_corename(char *corename, const char *pattern, long signr) *out_ptr = 0; } +static void zap_threads (struct mm_struct *mm) +{ + struct task_struct *g, *p; + + /* give other threads a chance to run: */ + yield(); + + read_lock(&tasklist_lock); + do_each_thread(g,p) + if (mm == p->mm && !p->core_waiter) + force_sig_specific(SIGKILL, p); + while_each_thread(g,p); + read_unlock(&tasklist_lock); +} + +static void coredump_wait(struct mm_struct *mm) +{ + DECLARE_WAITQUEUE(wait, current); + + atomic_inc(&mm->core_waiters); + add_wait_queue(&mm->core_wait, &wait); + zap_threads(mm); + current->state = TASK_UNINTERRUPTIBLE; + if (atomic_read(&mm->core_waiters) != atomic_read(&mm->mm_users)) + schedule(); + else + current->state = TASK_RUNNING; +} + int do_coredump(long signr, struct pt_regs * regs) { struct linux_binfmt * binfmt; @@ -1224,13 +1253,16 @@ int do_coredump(long signr, struct pt_regs * regs) if (!current->mm->dumpable) goto fail; current->mm->dumpable = 0; + if (down_trylock(¤t->mm->core_sem)) + BUG(); + coredump_wait(current->mm); if (current->rlim[RLIMIT_CORE].rlim_cur < binfmt->min_coredump) - goto fail; + goto fail_unlock; format_corename(corename, core_pattern, signr); file = filp_open(corename, O_CREAT | 2 | O_NOFOLLOW, 0600); if (IS_ERR(file)) - goto fail; + goto fail_unlock; inode = file->f_dentry->d_inode; if (inode->i_nlink > 1) goto close_fail; /* multiple links - don't dump */ @@ -1250,6 +1282,8 @@ int do_coredump(long signr, struct pt_regs * regs) close_fail: filp_close(file, NULL); +fail_unlock: + up(¤t->mm->core_sem); fail: unlock_kernel(); return retval; |