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Improve alloca() memory safety

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Now that all the bugs have been wormed out of the ASAN memory module we
can successfully check for underruns on large stack allocations.
This commit is contained in:
Justine Tunney 2022-04-01 22:44:43 -07:00
parent 1ff1854107
commit 38cb6e71ca
4 changed files with 10 additions and 13 deletions
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6
third_party/python/Modules/faulthandler.c vendored
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@ -1121,18 +1121,18 @@ faulthandler_fatal_error_py(PyObject *self, PyObject *args)
#if defined(HAVE_SIGALTSTACK) && defined(HAVE_SIGACTION)
#define FAULTHANDLER_STACK_OVERFLOW
static
static dontinline
uintptr_t
stack_overflow(uintptr_t min_sp, uintptr_t max_sp, size_t *depth)
{
/* allocate 4096 bytes on the stack at each call */
unsigned char buffer[4096];
unsigned char buffer[3500]; // [jart] or not
uintptr_t sp = (uintptr_t)&buffer;
*depth += 1;
if (sp < min_sp || max_sp < sp)
return sp;
buffer[0] = 1;
buffer[4095] = 0;
buffer[3500-1] = 0;
return stack_overflow(min_sp, max_sp, depth);
}