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authorTimo Warns <Warns@pre-sense.de>2011-05-26 16:25:57 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-08-29 14:08:05 -0700
commit098c4cab3a9eaf734d7d99feb55a521be90da37d (patch)
tree4415297e76d9d4eafce44f9c76992045049a94d4 /fs/minix
parentb871297c35fbf85aeaa1f2776bd37c666089da26 (diff)
fs/partitions/efi.c: corrupted GUID partition tables can cause kernel oops
commit 3eb8e74ec72736b9b9d728bad30484ec89c91dde upstream. The kernel automatically evaluates partition tables of storage devices. The code for evaluating GUID partitions (in fs/partitions/efi.c) contains a bug that causes a kernel oops on certain corrupted GUID partition tables. This bug has security impacts, because it allows, for example, to prepare a storage device that crashes a kernel subsystem upon connecting the device (e.g., a "USB Stick of (Partial) Death"). crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size)); computes a CRC32 checksum over gpt covering (*gpt)->header_size bytes. There is no validation of (*gpt)->header_size before the efi_crc32 call. A corrupted partition table may have large values for (*gpt)->header_size. In this case, the CRC32 computation access memory beyond the memory allocated for gpt, which may cause a kernel heap overflow. Validate value of GUID partition table header size. [akpm@linux-foundation.org: fix layout and indenting] Signed-off-by: Timo Warns <warns@pre-sense.de> Cc: Matt Domsch <Matt_Domsch@dell.com> Cc: Eugene Teo <eugeneteo@kernel.sg> Cc: Dave Jones <davej@codemonkey.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> [dannf: backported to Debian's 2.6.32] Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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