[PATCH 5.14 231/334] lkdtm: replace SCSI_DISPATCH_CMD with SCSI_QUEUE_RQ

Greg Kroah-Hartman
2021-09-13T14:41:46Z

From: Kevin Mitchell <kevmitch@arista.com>

[ Upstream commit d1f278da6b11585f05b2755adfc8851cbf14a1ec ]

When scsi_dispatch_cmd was moved to scsi_lib.c and made static, some
compilers (i.e., at least gcc 8.4.0) decided to compile this
inline. This is a problem for lkdtm.ko, which inserted a kprobe
on this function for the SCSI_DISPATCH_CMD crashpoint.

Move this crashpoint one function up the call chain to
scsi_queue_rq. Though this is also a static function, it should never be
inlined because it is assigned as a structure entry. Therefore,
kprobe_register should always be able to find it.

Fixes: 82042a2cdb55 ("scsi: move scsi_dispatch_cmd to scsi_lib.c")
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kevin Mitchell <kevmitch@arista.com>
Link: https://lore.kernel.org/r/20210819022940.561875-2-kevmitch@arista.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
Documentation/fault-injection/provoke-crashes.rst | 2 +-
drivers/misc/lkdtm/core.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/fault-injection/provoke-crashes.rst b/Documentation/fault-injection/provoke-crashes.rst
index a20ba5d93932..18de17354206 100644
--- a/Documentation/fault-injection/provoke-crashes.rst
+++ b/Documentation/fault-injection/provoke-crashes.rst
@@ -29,7 +29,7 @@ recur_count
cpoint_name
Where in the kernel to trigger the action. It can be
one of INT_HARDWARE_ENTRY, INT_HW_IRQ_EN, INT_TASKLET_ENTRY,
- FS_DEVRW, MEM_SWAPOUT, TIMERADD, SCSI_DISPATCH_CMD,
+ FS_DEVRW, MEM_SWAPOUT, TIMERADD, SCSI_QUEUE_RQ,
IDE_CORE_CP, or DIRECT

cpoint_type
diff --git a/drivers/misc/lkdtm/core.c b/drivers/misc/lkdtm/core.c
index 9dda87c6b54a..016cb0b150fc 100644
--- a/drivers/misc/lkdtm/core.c
+++ b/drivers/misc/lkdtm/core.c
@@ -82,7 +82,7 @@ static struct crashpoint crashpoints[] = {
CRASHPOINT("FS_DEVRW", "ll_rw_block"),
CRASHPOINT("MEM_SWAPOUT", "shrink_inactive_list"),
CRASHPOINT("TIMERADD", "hrtimer_start"),
- CRASHPOINT("SCSI_DISPATCH_CMD", "scsi_dispatch_cmd"),
+ CRASHPOINT("SCSI_QUEUE_RQ", "scsi_queue_rq"),
CRASHPOINT("IDE_CORE_CP", "generic_ide_ioctl"),
#endif
};
--
2.30.2