diff options
| author |   dhartmei <dhartmei@openbsd.org> | 2002-07-29 19:54:42 +0000 |
|---|---|---|
| committer | dhartmei <dhartmei@openbsd.org> | 2002-07-29 19:54:42 +0000 |
| commit | f8c1f0d009f7abd3f8c7892ef28889e323bd1421 (patch) | |
| tree | fceaa25db605fa094524dea156a9f83969805383 /lib/libc/stdlib/exit.c | |
| parent | Try to modify __atexit directly and see if our function gets called. (diff) | |
| download | wireguard-openbsd-f8c1f0d009f7abd3f8c7892ef28889e323bd1421.tar.xz wireguard-openbsd-f8c1f0d009f7abd3f8c7892ef28889e323bd1421.zip | |
Replace atexit handler. mprotect() the pages so an attempt to modify the
function pointers from the outside will segfault. Idea, hints and feedback
from deraadt. ok deraadt.
Diffstat (limited to 'lib/libc/stdlib/exit.c')
| -rw-r--r-- | lib/libc/stdlib/exit.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/lib/libc/stdlib/exit.c b/lib/libc/stdlib/exit.c index ab53f9400bc..c16b33bd300 100644 --- a/lib/libc/stdlib/exit.c +++ b/lib/libc/stdlib/exit.c @@ -32,9 +32,11 @@ */ #if defined(LIBC_SCCS) && !defined(lint) -static char *rcsid = "$OpenBSD: exit.c,v 1.4 2000/01/06 08:45:50 d Exp $"; +static char *rcsid = "$OpenBSD: exit.c,v 1.5 2002/07/29 19:54:42 dhartmei Exp $"; #endif /* LIBC_SCCS and not lint */ +#include <sys/types.h> +#include <sys/mman.h> #include <stdlib.h> #include <unistd.h> #include "atexit.h" @@ -58,12 +60,19 @@ void exit(status) int status; { - register struct atexit *p; - register int n; + register struct atexit *p, *q; + register int n, pgsize = getpagesize(); - for (p = __atexit; p; p = p->next) - for (n = p->ind; --n >= 0;) - (*p->fns[n])(); + if (!__atexit_invalid) { + p = __atexit; + while (p != NULL) { + for (n = p->ind; --n >= 0;) + (*p->fns[n])(); + q = p; + p = p->next; + munmap(q, pgsize); + } + } if (__cleanup) (*__cleanup)(); _exit(status); |