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![]() 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> |
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acorn.c | ||
acorn.h | ||
amiga.c | ||
amiga.h | ||
atari.c | ||
atari.h | ||
check.c | ||
check.h | ||
efi.c | ||
efi.h | ||
ibm.c | ||
ibm.h | ||
karma.c | ||
karma.h | ||
Kconfig | ||
ldm.c | ||
ldm.h | ||
mac.c | ||
mac.h | ||
Makefile | ||
msdos.c | ||
msdos.h | ||
osf.c | ||
osf.h | ||
sgi.c | ||
sgi.h | ||
sun.c | ||
sun.h | ||
sysv68.c | ||
sysv68.h | ||
ultrix.c | ||
ultrix.h |