Date: Wed, 08 Feb 2023 10:42:19 +0100 From: Florian Weimer <fweimer@...hat.com> To: Georgi Guninski <gguninski@...il.com> Cc: oss-security@...ts.openwall.com Subject: Re: SEGV in `alloca(BIG)` and `long pl[BIG]` * Georgi Guninski: > Inline are two C warez, which crash on > `alloca(BIG)` and `long pl[BIG]`. > > I think alloca(BIG) should return error if BIG>max_signed_size_t. > In C++ `new[BUG]` throws exception and core dumps. Unfortunately, alloca cannot report an error, and there is no portable way to discover stack boundaries anyway. With -fstack-clash-protection, we could reliably produce crashes, but the feature is somewhat incomplete: Integer overflows in dynamically-sized stack allocations with -fstack-clash-protection <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83697> Thanks, Florian
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