diff options
| author |   tdeval <tdeval@openbsd.org> | 2001-10-30 17:01:07 +0000 |
|---|---|---|
| committer | tdeval <tdeval@openbsd.org> | 2001-10-30 17:01:07 +0000 |
| commit | a2440a82cd4803f90b2b454ec7a08ae5abf124b6 (patch) | |
| tree | c73de485ebe5d3636f5979bf400fa7b2ed9afb50 /lib/libc/stdlib/malloc.3 | |
| parent | correct realloc() misuse (diff) | |
| download | wireguard-openbsd-a2440a82cd4803f90b2b454ec7a08ae5abf124b6.tar.xz wireguard-openbsd-a2440a82cd4803f90b2b454ec7a08ae5abf124b6.zip | |
mprotect allocations sized at 0 bytes. This will cause a fault for access
to such, permitting them to be discovered, instead of exploited as the ssh
crc insertion detector was. Idea by theo, written by tdeval.
Diffstat (limited to 'lib/libc/stdlib/malloc.3')
| -rw-r--r-- | lib/libc/stdlib/malloc.3 | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/libc/stdlib/malloc.3 b/lib/libc/stdlib/malloc.3 index e65668566e6..2f7e0c61b52 100644 --- a/lib/libc/stdlib/malloc.3 +++ b/lib/libc/stdlib/malloc.3 @@ -34,7 +34,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.\" $OpenBSD: malloc.3,v 1.20 2000/10/25 15:23:15 aaron Exp $ +.\" $OpenBSD: malloc.3,v 1.21 2001/10/30 17:01:07 tdeval Exp $ .\" .Dd August 27, 1996 .Dt MALLOC 3 @@ -79,6 +79,8 @@ If the space is of or larger, the memory returned will be page-aligned. .Pp Allocation of a zero size object returns a pointer to a zero size object. +This zero size object is access protected, so any access to it will +generate an exception (SIGSEGV) .Pp The .Fn calloc |