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authorAlden Tondettar <alden.tondettar@gmail.com>2017-01-15 15:31:56 -0700
committerJens Axboe <axboe@fb.com>2017-01-17 09:02:31 -0700
commitc5082b70adfe8e1ea1cf4a8eff92c9f260e364d2 (patch)
tree2cc8bab578b10b57837d87d9ec274aa19af7b2a3 /block/noop-iosched.c
parent1e668f4e7921e8c82838cf5f95ff4a2d5c852efc (diff)
downloadlinux-0-day-c5082b70adfe8e1ea1cf4a8eff92c9f260e364d2.tar.gz
partitions/efi: Fix integer overflow in GPT size calculation
If a GUID Partition Table claims to have more than 2**25 entries, the calculation of the partition table size in alloc_read_gpt_entries() will overflow a 32-bit integer and not enough space will be allocated for the table. Nothing seems to get written out of bounds, but later efi_partition() will read up to 32768 bytes from a 128 byte buffer, possibly OOPSing or exposing information to /proc/partitions and uevents. The problem exists on both 64-bit and 32-bit platforms. Fix the overflow and also print a meaningful debug message if the table size is too large. Signed-off-by: Alden Tondettar <alden.tondettar@gmail.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/noop-iosched.c')
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