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| author | Alexey Dobriyan <adobriyan@gmail.com> | 2024-09-03 22:48:19 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-01 18:37:54 +0100 |
| commit | a99bacb35c1416355eef957560e8fcac3a665549 (patch) | |
| tree | f25ff53d9e359876b9a2598fb1e9bab4b02e93c6 /block | |
| parent | f4168299e553f17aa2ba4016e77a9c38da40eb1d (diff) | |
| download | linux-a99bacb35c1416355eef957560e8fcac3a665549.tar.gz linux-a99bacb35c1416355eef957560e8fcac3a665549.tar.bz2 linux-a99bacb35c1416355eef957560e8fcac3a665549.zip | |
block: fix integer overflow in BLKSECDISCARD
commit 697ba0b6ec4ae04afb67d3911799b5e2043b4455 upstream.
I independently rediscovered
commit 22d24a544b0d49bbcbd61c8c0eaf77d3c9297155
block: fix overflow in blk_ioctl_discard()
but for secure erase.
Same problem:
uint64_t r[2] = {512, 18446744073709551104ULL};
ioctl(fd, BLKSECDISCARD, r);
will enter near infinite loop inside blkdev_issue_secure_erase():
a.out: attempt to access beyond end of device
loop0: rw=5, sector=3399043073, nr_sectors = 1024 limit=2048
bio_check_eod: 3286214 callbacks suppressed
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Link: https://lore.kernel.org/r/9e64057f-650a-46d1-b9f7-34af391536ef@p183
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Rajani Kantha <rajanikantha@engineer.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/ioctl.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/block/ioctl.c b/block/ioctl.c index 378603334284..231537f79a8c 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -115,7 +115,7 @@ static int blk_ioctl_discard(struct block_device *bdev, blk_mode_t mode, return -EINVAL; filemap_invalidate_lock(inode->i_mapping); - err = truncate_bdev_range(bdev, mode, start, start + len - 1); + err = truncate_bdev_range(bdev, mode, start, end - 1); if (err) goto fail; err = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); @@ -127,7 +127,7 @@ fail: static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode, void __user *argp) { - uint64_t start, len; + uint64_t start, len, end; uint64_t range[2]; int err; @@ -142,11 +142,12 @@ static int blk_ioctl_secure_erase(struct block_device *bdev, blk_mode_t mode, len = range[1]; if ((start & 511) || (len & 511)) return -EINVAL; - if (start + len > bdev_nr_bytes(bdev)) + if (check_add_overflow(start, len, &end) || + end > bdev_nr_bytes(bdev)) return -EINVAL; filemap_invalidate_lock(bdev->bd_inode->i_mapping); - err = truncate_bdev_range(bdev, mode, start, start + len - 1); + err = truncate_bdev_range(bdev, mode, start, end - 1); if (!err) err = blkdev_issue_secure_erase(bdev, start >> 9, len >> 9, GFP_KERNEL); |