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Fix an LBR sampling bug.

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'perf-urgent-2023-10-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 perf event fix from Ingo Molnar:
 "Fix an LBR sampling bug"

* tag 'perf-urgent-2023-10-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/lbr: Filter vsyscall addresses
This commit is contained in:
Linus Torvalds 2023-10-14 15:09:55 -07:00
commit 23931d9353
1 changed files with 3 additions and 2 deletions
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5
arch/x86/events/utils.c
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@ -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 from, unsigned long to, int abort,
* 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