Bryant G Ly f5957dade4 scsi: target: Fix fortify_panic kernel exception ... memcmp() requires the two buffers passed as arguments to be at least 'size' bytes long, otherwise a fortify_panic will trigger. Use memchr_inv() instead of memcmp() to determine whether the received payload is zeroed or not. The bug was found by running a block backstore via LIO. [ 496.212958] Call Trace: [ 496.212960] [c0000007e58e3800] [c000000000cbbefc] fortify_panic+0x24/0x38 (unreliable) [ 496.212965] [c0000007e58e3860] [d00000000f150c28] iblock_execute_write_same+0x3b8/0x3c0 [target_core_iblock] [ 496.212976] [c0000007e58e3910] [d000000006c737d4] __target_execute_cmd+0x54/0x150 [target_core_mod] [ 496.212982] [c0000007e58e3940] [d000000006d32ce4] ibmvscsis_write_pending+0x74/0xe0 [ibmvscsis] [ 496.212991] [c0000007e58e39b0] [d000000006c74fc8] transport_generic_new_cmd+0x318/0x370 [target_core_mod] [ 496.213001] [c0000007e58e3a30] [d000000006c75084] transport_handle_cdb_direct+0x64/0xd0 [target_core_mod] [ 496.213011] [c0000007e58e3aa0] [d000000006c75298] target_submit_cmd_map_sgls+0x1a8/0x320 [target_core_mod] [ 496.213021] [c0000007e58e3b30] [d000000006c75458] target_submit_cmd+0x48/0x60 [target_core_mod] [ 496.213026] [c0000007e58e3bd0] [d000000006d34c20] ibmvscsis_scheduler+0x370/0x600 [ibmvscsis] [ 496.213031] [c0000007e58e3c90] [c00000000013135c] process_one_work+0x1ec/0x580 [ 496.213035] [c0000007e58e3d20] [c000000000131798] worker_thread+0xa8/0x600 [ 496.213039] [c0000007e58e3dc0] [c00000000013a468] kthread+0x168/0x1b0 [ 496.213044] [c0000007e58e3e30] [c00000000000b528] ret_from_kernel_thread+0x5c/0xb4 [mkp: tweaked commit message] Fixes: 2237498f0b ("target/iblock: Convert WRITE_SAME to blkdev_issue_zeroout") Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com> Reviewed-by: Steven Royer <seroyer@linux.vnet.ibm.com> Tested-by: Taylor Jakobson <tjakobs@us.ibm.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Nicholas Bellinger <nab@linux-iscsi.org> Cc: <stable@vger.kernel.org> # v4.13+ Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>		2018-04-20 19:24:01 -04:00
..
iscsi	for-4.17/block-20180402	2018-04-05 14:27:02 -07:00
loopback	target/tcm_loop: Use blk_queue_flag_set()	2018-03-08 14:13:48 -07:00
sbp	sbp-target: Delete an error message for a failed memory allocation in three functions	2018-01-12 15:07:21 -08:00
tcm_fc
Kconfig	target: Use sgl_alloc_order() and sgl_free()	2018-01-06 09:18:00 -07:00
Makefile
target_core_alua.c
target_core_alua.h	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2017-11-24 19:19:20 -10:00
target_core_configfs.c	target core: add device action configfs files	2018-01-16 18:05:04 -08:00
target_core_device.c	target: fix destroy device in target_configure_device	2018-01-18 01:21:11 -08:00
target_core_fabric_configfs.c
target_core_fabric_lib.c	target-core: don't use "const char*" for a buffer that is written to	2018-01-12 15:07:09 -08:00
target_core_file.c
target_core_file.h
target_core_hba.c
target_core_iblock.c	scsi: target: Fix fortify_panic kernel exception	2018-04-20 19:24:01 -04:00
target_core_iblock.h
target_core_internal.h	target core: add device action configfs files	2018-01-16 18:05:04 -08:00
target_core_pr.c	target-core: don't use "const char*" for a buffer that is written to	2018-01-12 15:07:09 -08:00
target_core_pr.h
target_core_pscsi.c	scsi: target: fix crash with iscsi target and dvd	2018-04-19 00:41:03 -04:00
target_core_pscsi.h
target_core_rd.c
target_core_rd.h
target_core_sbc.c	target: don't call an unmap callback if a range length is zero	2018-01-12 15:07:28 -08:00
target_core_spc.c
target_core_stat.c
target_core_tmr.c
target_core_tpg.c
target_core_transport.c	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2018-02-09 14:49:46 -08:00
target_core_ua.c
target_core_ua.h
target_core_user.c	tcmu: Fix trailing semicolon	2018-01-18 01:21:24 -08:00
target_core_xcopy.c
target_core_xcopy.h