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Mathieu Desnoyers 0ac569bf6a ARM: 8834/1: Fix: kprobes: optimized kprobes illegal instruction 
commit e46daee53b ("ARM: 8806/1: kprobes: Fix false positive with
FORTIFY_SOURCE") introduced a regression in optimized kprobes. It
triggers "invalid instruction" oopses when using kprobes instrumentation
through lttng and perf. This commit was introduced in kernel v4.20, and
has been backported to stable kernels 4.19 and 4.14.

This crash was also reported by Hongzhi Song on the redhat bugzilla
where the patch was originally introduced.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1639397
Link: https://bugs.lttng.org/issues/1174
Link: https://lore.kernel.org/lkml/342740659.2887.1549307721609.JavaMail.zimbra@efficios.com

Fixes: e46daee53b ("ARM: 8806/1: kprobes: Fix false positive with FORTIFY_SOURCE")
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reported-by: Robert Berger <Robert.Berger@ReliableEmbeddedSystems.com>
Tested-by: Robert Berger <Robert.Berger@ReliableEmbeddedSystems.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Robert Berger <Robert.Berger@ReliableEmbeddedSystems.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: William Cohen <wcohen@redhat.com>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: <stable@vger.kernel.org> # v4.14+
Cc: linux-arm-kernel@lists.infradead.org
Cc: patches@armlinux.org.uk
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
 		2019-02-12 15:20:58 +00:00
..
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
actions-arm.c ARM: kprobes: check register usage for probed instruction. 2015-01-13 16:10:48 +00:00
actions-common.c
…
actions-thumb.c ARM: kprobes: collects stack consumption for store instructions 2015-01-13 16:10:06 +00:00
checkers-arm.c ARM: kprobes: check register usage for probed instruction. 2015-01-13 16:10:48 +00:00
checkers-common.c ARM: kprobes: collects stack consumption for store instructions 2015-01-13 16:10:06 +00:00
checkers-thumb.c ARM: kprobes: collects stack consumption for store instructions 2015-01-13 16:10:06 +00:00
checkers.h ARM: kprobes: check register usage for probed instruction. 2015-01-13 16:10:48 +00:00
core.c kprobes/arm: Fix %p uses in error messages 2018-06-21 17:33:42 +02:00
core.h ARM: kprobes: Fix compilation error caused by superfluous '*' 2015-02-10 15:05:30 +08:00
opt-arm.c ARM: 8834/1: Fix: kprobes: optimized kprobes illegal instruction 2019-02-12 15:20:58 +00:00
test-arm.c ARM: kprobes: Eliminate test code's use of BX instruction on ARMv4 CPUs 2015-01-20 09:06:04 +00:00
test-core.c kprobes/arm: Fix %p uses in error messages 2018-06-21 17:33:42 +02:00
test-core.h ARM: kprobes: Fix unreliable MRS instruction tests 2015-01-13 16:10:17 +00:00
test-thumb.c ARM: kprobes: Fix unreliable MRS instruction tests 2015-01-13 16:10:17 +00:00