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Fix stdio regression

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This change fixes a nasty regression caused by
80b211e314 which deadlocked.

This change also causes MbedTLS to prefer the ChaCha ciphersuite on
older CPUs that don't have AES hardware instructions.
This commit is contained in:
Justine Tunney 2022-05-19 00:34:15 -07:00
parent 9208c83f7a
commit 6e52cba37a
14 changed files with 232 additions and 51 deletions
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10
third_party/python/Objects/obmalloc.c vendored
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@ -1984,8 +1984,8 @@ _PyMem_DebugRawAlloc(int use_calloc, void *ctx, size_t nbytes)
_PyMem_DebugCheckAddress(api->api_id, p+2*SST);
if (IsAsan()) {
__asan_poison((uintptr_t)(p + SST + 1), SST-1, kAsanHeapUnderrun);
__asan_poison((uintptr_t)tail, SST, kAsanHeapOverrun);
__asan_poison((p + SST + 1), SST-1, kAsanHeapUnderrun);
__asan_poison(tail, SST, kAsanHeapOverrun);
}
return p + 2*SST;
@ -2041,7 +2041,7 @@ _PyMem_DebugRawFree(void *ctx, void *p)
nbytes += 4*SST;
if (nbytes > 0) {
if (IsAsan()) {
__asan_unpoison((uintptr_t)q, nbytes);
__asan_unpoison(q, nbytes);
}
memset(q, DEADBYTE, nbytes);
}
@ -2080,12 +2080,12 @@ _PyMem_DebugRawRealloc(void *ctx, void *p, size_t nbytes)
tail = q + nbytes;
w = 0x0101010101010101ull * FORBIDDENBYTE;
WRITE64LE(tail, w);
if (IsAsan()) __asan_poison((uintptr_t)tail, SST, kAsanHeapOverrun);
if (IsAsan()) __asan_poison(tail, SST, kAsanHeapOverrun);
write_size_t(tail + SST, serialno);
if (nbytes > original_nbytes) {
/* growing: mark new extra memory clean */
if (IsAsan()) {
__asan_unpoison((uintptr_t)(q + original_nbytes),
__asan_unpoison((q + original_nbytes),
nbytes - original_nbytes);
}
memset(q + original_nbytes, CLEANBYTE,