6.11-stable review patch. If anyone has any objections, please let me know.
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From: Mikulas Patocka mpatocka@redhat.com
commit e6a3531dd542cb127c8de32ab1e54a48ae19962b upstream.
Maxim Suhanov reported that dm-verity doesn't crash if an I/O error happens. In theory, this could be used to subvert security, because an attacker can create sectors that return error with the Write Uncorrectable command. Some programs may misbehave if they have to deal with EIO.
This commit fixes dm-verity, so that if "panic_on_corruption" or "restart_on_corruption" was specified and an I/O error happens, the machine will panic or restart.
This commit also changes kernel_restart to emergency_restart - kernel_restart calls reboot notifiers and these reboot notifiers may wait for the bio that failed. emergency_restart doesn't call the notifiers.
Reported-by: Maxim Suhanov dfirblog@gmail.com Signed-off-by: Mikulas Patocka mpatocka@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/md/dm-verity-target.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-)
--- a/drivers/md/dm-verity-target.c +++ b/drivers/md/dm-verity-target.c @@ -272,8 +272,10 @@ out: if (v->mode == DM_VERITY_MODE_LOGGING) return 0;
- if (v->mode == DM_VERITY_MODE_RESTART) - kernel_restart("dm-verity device corrupted"); + if (v->mode == DM_VERITY_MODE_RESTART) { + pr_emerg("dm-verity device corrupted\n"); + emergency_restart(); + }
if (v->mode == DM_VERITY_MODE_PANIC) panic("dm-verity device corrupted"); @@ -596,6 +598,23 @@ static void verity_finish_io(struct dm_v if (!static_branch_unlikely(&use_bh_wq_enabled) || !io->in_bh) verity_fec_finish_io(io);
+ if (unlikely(status != BLK_STS_OK) && + unlikely(!(bio->bi_opf & REQ_RAHEAD)) && + !verity_is_system_shutting_down()) { + if (v->mode == DM_VERITY_MODE_RESTART || + v->mode == DM_VERITY_MODE_PANIC) + DMERR_LIMIT("%s has error: %s", v->data_dev->name, + blk_status_to_str(status)); + + if (v->mode == DM_VERITY_MODE_RESTART) { + pr_emerg("dm-verity device corrupted\n"); + emergency_restart(); + } + + if (v->mode == DM_VERITY_MODE_PANIC) + panic("dm-verity device corrupted"); + } + bio_endio(bio); }