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commit 2954daf00bb4dc27c69a48e6798d5960ea320741
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Author: Andreas Schwab <schwab@suse.de>
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Date: Tue Oct 23 09:40:14 2018 +0200
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Add more checks for valid ld.so.cache file (bug 18093)
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diff --git a/elf/cache.c b/elf/cache.c
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index e63979da7d25560c..c4cd825c30e00e8e 100644
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--- a/elf/cache.c
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+++ b/elf/cache.c
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@@ -199,6 +199,11 @@ print_cache (const char *cache_name)
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}
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else
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{
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+ /* Check for corruption, avoiding overflow. */
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+ if ((cache_size - sizeof (struct cache_file)) / sizeof (struct file_entry)
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+ < cache->nlibs)
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+ error (EXIT_FAILURE, 0, _("File is not a cache file.\n"));
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+
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size_t offset = ALIGN_CACHE (sizeof (struct cache_file)
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+ (cache->nlibs
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* sizeof (struct file_entry)));
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diff --git a/elf/dl-cache.c b/elf/dl-cache.c
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index 6ee5153ff9514872..6dd99a35b9f97cfb 100644
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--- a/elf/dl-cache.c
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+++ b/elf/dl-cache.c
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@@ -204,7 +204,10 @@ _dl_load_cache_lookup (const char *name)
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- only the new format
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The following checks if the cache contains any of these formats. */
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if (file != MAP_FAILED && cachesize > sizeof *cache
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- && memcmp (file, CACHEMAGIC, sizeof CACHEMAGIC - 1) == 0)
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+ && memcmp (file, CACHEMAGIC, sizeof CACHEMAGIC - 1) == 0
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+ /* Check for corruption, avoiding overflow. */
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+ && ((cachesize - sizeof *cache) / sizeof (struct file_entry)
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+ >= ((struct cache_file *) file)->nlibs))
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{
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size_t offset;
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/* Looks ok. */
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