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Add more checks for valid ld.so.cache file (bug 18093)

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This commit is contained in:
Andreas Schwab
2018-10-23 09:40:14 +02:00
parent a27a4f4721
commit 2954daf00b
3 changed files with 16 additions and 1 deletions
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5
elf/dl-cache.c
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@ -204,7 +204,10 @@ _dl_load_cache_lookup (const char *name)
- only the new format
The following checks if the cache contains any of these formats. */
if (file != MAP_FAILED && cachesize > sizeof *cache
&& memcmp (file, CACHEMAGIC, sizeof CACHEMAGIC - 1) == 0)
&& memcmp (file, CACHEMAGIC, sizeof CACHEMAGIC - 1) == 0
/* Check for corruption, avoiding overflow. */
&& ((cachesize - sizeof *cache) / sizeof (struct file_entry)
>= ((struct cache_file *) file)->nlibs))
{
size_t offset;
/* Looks ok. */