This is a note to let you know that I've just added the patch titled
perf/x86/lbr: Filter vsyscall addresses
to the 6.1-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:
perf-x86-lbr-filter-vsyscall-addresses.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e53899771a02f798d436655efbd9d4b46c0f9265 Mon Sep 17 00:00:00 2001
From: JP Kobryn <inwardvessel@xxxxxxxxx>
Date: Fri, 6 Oct 2023 11:57:26 -0700
Subject: perf/x86/lbr: Filter vsyscall addresses
From: JP Kobryn <inwardvessel@xxxxxxxxx>
commit e53899771a02f798d436655efbd9d4b46c0f9265 upstream.
We found that a panic can occur when a vsyscall is made while LBR sampling
is active. If the vsyscall is interrupted (NMI) for perf sampling, this
call sequence can occur (most recent at top):
__insn_get_emulate_prefix()
insn_get_emulate_prefix()
insn_get_prefixes()
insn_get_opcode()
decode_branch_type()
get_branch_type()
intel_pmu_lbr_filter()
intel_pmu_handle_irq()
perf_event_nmi_handler()
Within __insn_get_emulate_prefix() at frame 0, a macro is called:
peek_nbyte_next(insn_byte_t, insn, i)
Within this macro, this dereference occurs:
(insn)->next_byte
Inspecting registers at this point, the value of the next_byte field is the
address of the vsyscall made, for example the location of the vsyscall
version of gettimeofday() at 0xffffffffff600000. The access to an address
in the vsyscall region will trigger an oops due to an unhandled page fault.
To fix the bug, filtering for vsyscalls can be done when
determining the branch type. This patch will return
a "none" branch if a kernel address if found to lie in the
vsyscall region.
Suggested-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Signed-off-by: JP Kobryn <inwardvessel@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/events/utils.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/arch/x86/events/utils.c
+++ b/arch/x86/events/utils.c
@@ -1,5 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <asm/insn.h>
+#include <linux/mm.h>
#include "perf_event.h"
@@ -132,9 +133,9 @@ static int get_branch_type(unsigned long
* The LBR logs any address in the IP, even if the IP just
* faulted. This means userspace can control the from address.
* Ensure we don't blindly read any address by validating it is
- * a known text address.
+ * a known text address and not a vsyscall address.
*/
- if (kernel_text_address(from)) {
+ if (kernel_text_address(from) && !in_gate_area_no_mm(from)) {
addr = (void *)from;
/*
* Assume we can get the maximum possible size
Patches currently in stable-queue which might be from inwardvessel@xxxxxxxxx are
queue-6.1/perf-x86-lbr-filter-vsyscall-addresses.patch
