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malloc: Switch global_max_fast to uint8_t

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MAX_FAST_SIZE is 160 at most, so a uint8_t is sufficient.  This makes
it harder to use memory corruption, by overwriting global_max_fast
with a large value, to fundamentally alter malloc behavior.

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Florian Weimer 2022-10-13 05:45:41 +02:00
parent ba0ca36132
commit 15a94e6668
1 changed files with 1 additions and 1 deletions
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2
malloc/malloc.c
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@ -1757,7 +1757,7 @@ typedef struct malloc_chunk *mfastbinptr;
#define set_contiguous(M) ((M)->flags &= ~NONCONTIGUOUS_BIT) #define set_contiguous(M) ((M)->flags &= ~NONCONTIGUOUS_BIT)
/* Maximum size of memory handled in fastbins. */ /* Maximum size of memory handled in fastbins. */
static INTERNAL_SIZE_T global_max_fast; static uint8_t global_max_fast;
/* /*
Set value of max_fast. Set value of max_fast.