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msvcrt: Write memory forward in memset. 

Instead of going backward, which breaks the Linux kernel transparent
huge pages allocation assumptions.

This can be reproduced by calling memset on large, newly allocated,
memory regions.

Signed-off-by: Rémi Bernon <rbernon@codeweavers.com>
Signed-off-by: Piotr Caban <piotr@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Rémi Bernon 2021-10-21 10:44:29 +02:00 committed by Alexandre Julliard
parent f7ac9f309f
commit 7c046c7afd
1 changed files with 7 additions and 6 deletions
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13
dlls/msvcrt/string.c
View File

@ -2857,13 +2857,14 @@ void * __cdecl memcpy(void *dst, const void *src, size_t n)
static inline void memset_aligned_32(unsigned char *d, uint64_t v, size_t n)
{
while (n >= 32)
unsigned char *end = d + n;
while (d < end)
{
*(uint64_t *)(d + n - 32) = v;
*(uint64_t *)(d + n - 24) = v;
*(uint64_t *)(d + n - 16) = v;
*(uint64_t *)(d + n - 8) = v;
n -= 32;
*(uint64_t *)(d + 0) = v;
*(uint64_t *)(d + 8) = v;
*(uint64_t *)(d + 16) = v;
*(uint64_t *)(d + 24) = v;
d += 32;
}
}