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authorCarlos Maiolino <cmaiolino@redhat.com>2019-02-26 13:51:50 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-04-27 10:33:49 +0300
commit2e5086f3ac6f1a3aad4d95adf7cae9ec0f956c75 (patch)
treec49f5f224c0dba09311cf6a0c61503cd6706e802 /fs/buffer.c
parent8f983d2cbfad7e79f6115b5666ffee4d6538b4ec (diff)
downloadlinux-2e5086f3ac6f1a3aad4d95adf7cae9ec0f956c75.tar.xz
fs: fix guard_bio_eod to check for real EOD errors
[ Upstream commit dce30ca9e3b676fb288c33c1f4725a0621361185 ] guard_bio_eod() can truncate a segment in bio to allow it to do IO on odd last sectors of a device. It already checks if the IO starts past EOD, but it does not consider the possibility of an IO request starting within device boundaries can contain more than one segment past EOD. In such cases, truncated_bytes can be bigger than PAGE_SIZE, and will underflow bvec->bv_len. Fix this by checking if truncated_bytes is lower than PAGE_SIZE. This situation has been found on filesystems such as isofs and vfat, which doesn't check the device size before mount, if the device is smaller than the filesystem itself, a readahead on such filesystem, which spans EOD, can trigger this situation, leading a call to zero_user() with a wrong size possibly corrupting memory. I didn't see any crash, or didn't let the system run long enough to check if memory corruption will be hit somewhere, but adding instrumentation to guard_bio_end() to check truncated_bytes size, was enough to see the error. The following script can trigger the error. MNT=/mnt IMG=./DISK.img DEV=/dev/loop0 mkfs.vfat $IMG mount $IMG $MNT cp -R /etc $MNT &> /dev/null umount $MNT losetup -D losetup --find --show --sizelimit 16247280 $IMG mount $DEV $MNT find $MNT -type f -exec cat {} + >/dev/null Kudos to Eric Sandeen for coming up with the reproducer above Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/buffer.c')
-rw-r--r--fs/buffer.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/buffer.c b/fs/buffer.c
index 6f7d519a093b..f278e27bd8c0 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2985,6 +2985,13 @@ void guard_bio_eod(int rw, struct bio *bio)
/* Uhhuh. We've got a bio that straddles the device size! */
truncated_bytes = bio->bi_iter.bi_size - (maxsector << 9);
+ /*
+ * The bio contains more than one segment which spans EOD, just return
+ * and let IO layer turn it into an EIO
+ */
+ if (truncated_bytes > bvec->bv_len)
+ return;
+
/* Truncate the bio.. */
bio->bi_iter.bi_size -= truncated_bytes;
bvec->bv_len -= truncated_bytes;