This is a note to let you know that I've just added the patch titled
powerpc/perf: Dereference BHRB entries safely
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-perf-dereference-bhrb-entries-safely.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f41d84dddc66b164ac16acf3f584c276146f1c48 Mon Sep 17 00:00:00 2001
From: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxxxxxxx>
Date: Tue, 12 Dec 2017 17:59:15 +0530
Subject: powerpc/perf: Dereference BHRB entries safely
From: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxxxxxxx>
commit f41d84dddc66b164ac16acf3f584c276146f1c48 upstream.
It's theoretically possible that branch instructions recorded in
BHRB (Branch History Rolling Buffer) entries have already been
unmapped before they are processed by the kernel. Hence, trying to
dereference such memory location will result in a crash. eg:
Unable to handle kernel paging request for data at address 0xd000000019c41764
Faulting instruction address: 0xc000000000084a14
NIP [c000000000084a14] branch_target+0x4/0x70
LR [c0000000000eb828] record_and_restart+0x568/0x5c0
Call Trace:
[c0000000000eb3b4] record_and_restart+0xf4/0x5c0 (unreliable)
[c0000000000ec378] perf_event_interrupt+0x298/0x460
[c000000000027964] performance_monitor_exception+0x54/0x70
[c000000000009ba4] performance_monitor_common+0x114/0x120
Fix it by deferefencing the addresses safely.
Fixes: 691231846ceb ("powerpc/perf: Fix setting of "to" addresses for BHRB")
Suggested-by: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Naveen N. Rao <naveen.n.rao@xxxxxxxxxxxxxxxxxx>
[mpe: Use probe_kernel_read() which is clearer, tweak change log]
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/perf/core-book3s.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/arch/powerpc/perf/core-book3s.c
+++ b/arch/powerpc/perf/core-book3s.c
@@ -401,8 +401,12 @@ static __u64 power_pmu_bhrb_to(u64 addr)
int ret;
__u64 target;
- if (is_kernel_addr(addr))
- return branch_target((unsigned int *)addr);
+ if (is_kernel_addr(addr)) {
+ if (probe_kernel_read(&instr, (void *)addr, sizeof(instr)))
+ return 0;
+
+ return branch_target(&instr);
+ }
/* Userspace: need copy instruction here then translate it */
pagefault_disable();
Patches currently in stable-queue which might be from ravi.bangoria@xxxxxxxxxxxxxxxxxx are
queue-4.4/powerpc-perf-dereference-bhrb-entries-safely.patch