* [PATCH 1/1] Fix: arm: kprobes: optimized kprobes illegal instruction
@ 2019-02-05 15:37 Mathieu Desnoyers
2019-02-06 4:39 ` Masami Hiramatsu
0 siblings, 1 reply; 3+ messages in thread
From: Mathieu Desnoyers @ 2019-02-05 15:37 UTC (permalink / raw)
To: patches
Cc: Kees Cook, linux-kernel, # v4 . 14+,
Russell King, Mathieu Desnoyers, Masami Hiramatsu, Robert Berger,
William Cohen, Laura Abbott, linux-arm-kernel
commit e46daee53bb5 ("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: e46daee53bb5 ("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: Russell King <rmk+kernel@armlinux.org.uk>
CC: <stable@vger.kernel.org> # v4.14+
CC: linux-arm-kernel@lists.infradead.org
CC: patches@armlinux.org.uk
---
KernelVersion: 5.0.0-rc5
arch/arm/probes/kprobes/opt-arm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/probes/kprobes/opt-arm.c b/arch/arm/probes/kprobes/opt-arm.c
index 2c118a6ab358..0dc23fc227ed 100644
--- a/arch/arm/probes/kprobes/opt-arm.c
+++ b/arch/arm/probes/kprobes/opt-arm.c
@@ -247,7 +247,7 @@ int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *or
}
/* Copy arch-dep-instance from template. */
- memcpy(code, (unsigned char *)optprobe_template_entry,
+ memcpy(code, (unsigned long *)&optprobe_template_entry,
TMPL_END_IDX * sizeof(kprobe_opcode_t));
/* Adjust buffer according to instruction. */
--
2.11.0
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH 1/1] Fix: arm: kprobes: optimized kprobes illegal instruction
2019-02-05 15:37 [PATCH 1/1] Fix: arm: kprobes: optimized kprobes illegal instruction Mathieu Desnoyers
@ 2019-02-06 4:39 ` Masami Hiramatsu
0 siblings, 0 replies; 3+ messages in thread
From: Masami Hiramatsu @ 2019-02-06 4:39 UTC (permalink / raw)
To: Mathieu Desnoyers
Cc: Kees Cook, linux-kernel, # v4 . 14+,
Russell King, Masami Hiramatsu, Robert Berger, William Cohen,
Laura Abbott, linux-arm-kernel, patches
On Tue, 5 Feb 2019 10:37:40 -0500
Mathieu Desnoyers <mathieu.desnoyers@efficios.com> wrote:
> commit e46daee53bb5 ("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.
Thank you for fixing this.
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
>
> 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: e46daee53bb5 ("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: Russell King <rmk+kernel@armlinux.org.uk>
> CC: <stable@vger.kernel.org> # v4.14+
> CC: linux-arm-kernel@lists.infradead.org
> CC: patches@armlinux.org.uk
> ---
> KernelVersion: 5.0.0-rc5
> arch/arm/probes/kprobes/opt-arm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm/probes/kprobes/opt-arm.c b/arch/arm/probes/kprobes/opt-arm.c
> index 2c118a6ab358..0dc23fc227ed 100644
> --- a/arch/arm/probes/kprobes/opt-arm.c
> +++ b/arch/arm/probes/kprobes/opt-arm.c
> @@ -247,7 +247,7 @@ int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *or
> }
>
> /* Copy arch-dep-instance from template. */
> - memcpy(code, (unsigned char *)optprobe_template_entry,
> + memcpy(code, (unsigned long *)&optprobe_template_entry,
> TMPL_END_IDX * sizeof(kprobe_opcode_t));
>
> /* Adjust buffer according to instruction. */
> --
> 2.11.0
>
--
Masami Hiramatsu <mhiramat@kernel.org>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH 1/1] Fix: arm: kprobes: optimized kprobes illegal instruction
@ 2019-02-05 15:28 Mathieu Desnoyers
0 siblings, 0 replies; 3+ messages in thread
From: Mathieu Desnoyers @ 2019-02-05 15:28 UTC (permalink / raw)
To: patches
Cc: Kees Cook, linux-kernel, # v4 . 14+,
Russell King, Mathieu Desnoyers, Masami Hiramatsu, Robert Berger,
William Cohen, Laura Abbott, linux-arm-kernel
commit e46daee53bb5 ("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: e46daee53bb5 ("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: Russell King <rmk+kernel@armlinux.org.uk>
CC: <stable@vger.kernel.org> # v4.14+
CC: linux-arm-kernel@lists.infradead.org
CC: patches@armlinux.org.uk
---
arch/arm/probes/kprobes/opt-arm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/probes/kprobes/opt-arm.c b/arch/arm/probes/kprobes/opt-arm.c
index 2c118a6ab358..0dc23fc227ed 100644
--- a/arch/arm/probes/kprobes/opt-arm.c
+++ b/arch/arm/probes/kprobes/opt-arm.c
@@ -247,7 +247,7 @@ int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *or
}
/* Copy arch-dep-instance from template. */
- memcpy(code, (unsigned char *)optprobe_template_entry,
+ memcpy(code, (unsigned long *)&optprobe_template_entry,
TMPL_END_IDX * sizeof(kprobe_opcode_t));
/* Adjust buffer according to instruction. */
--
2.11.0
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-02-06 4:39 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-02-05 15:37 [PATCH 1/1] Fix: arm: kprobes: optimized kprobes illegal instruction Mathieu Desnoyers
2019-02-06 4:39 ` Masami Hiramatsu
-- strict thread matches above, loose matches on Subject: below --
2019-02-05 15:28 Mathieu Desnoyers
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).