4.20-stable patches

added patches:
	arm-8834-1-fix-kprobes-optimized-kprobes-illegal-instruction.patch

diff --git a/queue-4.20/arm-8834-1-fix-kprobes-optimized-kprobes-illegal-instruction.patch b/queue-4.20/arm-8834-1-fix-kprobes-optimized-kprobes-illegal-instruction.patch
new file mode 100644 (file)
index 0000000..22dd6c5
--- /dev/null
+++ b/queue-4.20/arm-8834-1-fix-kprobes-optimized-kprobes-illegal-instruction.patch
@@ -0,0 +1,53 @@
+From 0ac569bf6a7983c0c5747d6df8db9dc05bc92b6c Mon Sep 17 00:00:00 2001
+From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+Date: Tue, 5 Feb 2019 16:37:40 +0100
+Subject: ARM: 8834/1: Fix: kprobes: optimized kprobes illegal instruction
+
+From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+
+commit 0ac569bf6a7983c0c5747d6df8db9dc05bc92b6c upstream.
+
+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: <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>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ arch/arm/probes/kprobes/opt-arm.c |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- 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
+       }
+ 
+       /* 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. */