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| author |   deraadt <deraadt@openbsd.org> | 2001-12-06 04:21:27 +0000 |
|---|---|---|
| committer | deraadt <deraadt@openbsd.org> | 2001-12-06 04:21:27 +0000 |
| commit | 290f140d4fb03df5d1d282b516c06fd1b3e6ca9d (patch) | |
| tree | b00f892bd8bc850354be88848fbe3b4908b49121 | |
| parent | remove kame IPSEC code within #ifdef. (diff) | |
| download | wireguard-openbsd-290f140d4fb03df5d1d282b516c06fd1b3e6ca9d.tar.xz wireguard-openbsd-290f140d4fb03df5d1d282b516c06fd1b3e6ca9d.zip | |
alloca cannot check if the allocation is valid. mention the consequences; millert ok
| -rw-r--r-- | lib/libc/stdlib/alloca.3 | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/lib/libc/stdlib/alloca.3 b/lib/libc/stdlib/alloca.3 index e9e0b67ee32..431443a6e65 100644 --- a/lib/libc/stdlib/alloca.3 +++ b/lib/libc/stdlib/alloca.3 @@ -29,7 +29,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.\" $OpenBSD: alloca.3,v 1.8 2000/04/20 13:50:01 aaron Exp $ +.\" $OpenBSD: alloca.3,v 1.9 2001/12/06 04:21:27 deraadt Exp $ .\" .Dd May 2, 1991 .Dt ALLOCA 3 @@ -70,3 +70,15 @@ function is machine dependent; its use is discouraged. .\" The function appeared in 32v, pwb and pwb.2 and in 3bsd 4bsd .\" The first man page (or link to a man page that I can find at the .\" moment is 4.3... +.Pp +The +.Fn alloca +function is slightly unsafe because it cannot ensure that the pointer +returned points to a valid and usable block of memory. +The allocation made may exceed the bounds of the stack, or even go +further into other objects in memory, and +.Fn alloca +cannot determine such an error. +Avoid +.Fn alloca +with large unbounded allocations. |