From 098c4cab3a9eaf734d7d99feb55a521be90da37d Mon Sep 17 00:00:00 2001 From: Timo Warns Date: Thu, 26 May 2011 16:25:57 -0700 Subject: [PATCH] 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 Cc: Matt Domsch Cc: Eugene Teo Cc: Dave Jones Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds [dannf: backported to Debian's 2.6.32] Signed-off-by: Greg Kroah-Hartman --- fs/partitions/efi.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/partitions/efi.c b/fs/partitions/efi.c index 2aac7764b7e5..6ab70f413a57 100644 --- a/fs/partitions/efi.c +++ b/fs/partitions/efi.c @@ -311,6 +311,15 @@ is_gpt_valid(struct block_device *bdev, u64 lba, goto fail; } + /* Check the GUID Partition Table header size */ + if (le32_to_cpu((*gpt)->header_size) > + bdev_logical_block_size(bdev)) { + pr_debug("GUID Partition Table Header size is wrong: %u > %u\n", + le32_to_cpu((*gpt)->header_size), + bdev_logical_block_size(bdev)); + goto fail; + } + /* Check the GUID Partition Table CRC */ origcrc = le32_to_cpu((*gpt)->header_crc32); (*gpt)->header_crc32 = 0; -- 2.39.5