From: Andi Kleen <andi@firstfloor.org>
To: linux-kernel@vger.kernel.org
Cc: acme@redhat.com, x86@vger.kernel.org, eranian@google.com,
jolsa@redhat.com, a.p.zijlstra@chello.nl,
Andi Kleen <ak@linux.intel.com>
Subject: [PATCH 09/31] perf, x86: Disable LBR recording for unknown LBR_FMT
Date: Tue, 2 Oct 2012 16:48:29 -0700 [thread overview]
Message-ID: <1349221731-15665-10-git-send-email-andi@firstfloor.org> (raw)
In-Reply-To: <1349221731-15665-1-git-send-email-andi@firstfloor.org>
From: Andi Kleen <ak@linux.intel.com>
When the LBR format is unknown disable LBR recording. This prevents
crashes when the LBR address is misdecoded and mis-sign extended.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
arch/x86/kernel/cpu/perf_event_intel_lbr.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
index 2af6695b..ad5af13 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c
@@ -13,6 +13,7 @@ enum {
LBR_FORMAT_EIP = 0x02,
LBR_FORMAT_EIP_FLAGS = 0x03,
LBR_FORMAT_EIP_FLAGS2 = 0x04,
+ LBR_FORMAT_MAX_KNOWN = LBR_FORMAT_EIP_FLAGS2,
};
/*
@@ -392,7 +393,7 @@ int intel_pmu_setup_lbr_filter(struct perf_event *event)
/*
* no LBR on this PMU
*/
- if (!x86_pmu.lbr_nr)
+ if (!x86_pmu.lbr_nr || x86_pmu.intel_cap.lbr_format > LBR_FORMAT_MAX_KNOWN)
return -EOPNOTSUPP;
/*
--
1.7.7.6
next prev parent reply other threads:[~2012-10-02 23:53 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-02 23:48 perf PMU support for Haswell v2 Andi Kleen
2012-10-02 23:48 ` [PATCH 01/31] perf, x86: Add PEBSv2 record support Andi Kleen
2012-10-02 23:48 ` [PATCH 02/31] perf, x86: Basic Haswell PMU support v2 Andi Kleen
2012-10-02 23:48 ` [PATCH 03/31] perf, x86: Basic Haswell PEBS support Andi Kleen
2012-10-02 23:48 ` [PATCH 04/31] perf, x86: Support the TSX intx/intx_cp qualifiers Andi Kleen
2012-10-02 23:48 ` [PATCH 05/31] perf, x86: Report PEBS event in a raw format Andi Kleen
2012-10-02 23:48 ` [PATCH 06/31] perf, kvm: Support the intx/intx_cp modifiers in KVM arch perfmon emulation Andi Kleen
2012-10-03 10:27 ` Avi Kivity
2012-10-03 12:11 ` Andi Kleen
2012-10-03 12:54 ` Avi Kivity
2012-10-04 9:10 ` [06/31] " Gleb Natapov
2012-10-02 23:48 ` [PATCH 07/31] perf, x86: Support PERF_SAMPLE_ADDR on Haswell Andi Kleen
2012-10-02 23:48 ` [PATCH 08/31] perf, x86: Support Haswell v4 LBR format Andi Kleen
2012-10-02 23:48 ` Andi Kleen [this message]
2012-10-02 23:48 ` [PATCH 10/31] perf, x86: Support LBR filtering by INTX/NOTX/ABORT Andi Kleen
2012-10-02 23:48 ` [PATCH 11/31] perf, tools: Add abort,notx,intx branch filter options to perf report -j Andi Kleen
2012-10-02 23:48 ` [PATCH 12/31] perf, tools: Support sorting by intx, abort branch flags Andi Kleen
2012-10-02 23:48 ` [PATCH 13/31] perf, x86: Support full width counting on Haswell Andi Kleen
2012-10-02 23:48 ` [PATCH 14/31] perf, x86: Avoid checkpointed counters causing excessive TSX aborts Andi Kleen
2012-10-02 23:48 ` [PATCH 15/31] perf, core: Add a concept of a weightened sample Andi Kleen
2012-10-02 23:48 ` [PATCH 16/31] perf, x86: Support weight samples for PEBS Andi Kleen
2012-10-02 23:48 ` [PATCH 17/31] perf, tools: Add support for weight Andi Kleen
2012-10-02 23:48 ` [PATCH 18/31] perf, tools: Handle XBEGIN like a jump Andi Kleen
2012-10-02 23:48 ` [PATCH 19/31] perf, x86: Support for printing PMU state on spurious PMIs v2 Andi Kleen
2012-10-02 23:48 ` [PATCH 20/31] perf, core: Add generic transaction flags Andi Kleen
2012-10-02 23:48 ` [PATCH 21/31] perf, x86: Add Haswell specific transaction flag reporting Andi Kleen
2012-10-02 23:48 ` [PATCH 22/31] perf, tools: Add support for record transaction flags Andi Kleen
2012-10-02 23:48 ` [PATCH 23/31] perf, tools: Point --sort documentation to --help Andi Kleen
2012-10-02 23:48 ` [PATCH 24/31] perf, tools: Add browser support for transaction flags Andi Kleen
2012-10-02 23:48 ` [PATCH 25/31] perf, tools: Move parse_events error printing to parse_events_options Andi Kleen
2012-10-02 23:48 ` [PATCH 26/31] perf, tools: Support events with - in the name Andi Kleen
2012-10-02 23:48 ` [PATCH 27/31] perf, x86: Report the arch perfmon events in sysfs Andi Kleen
2012-10-02 23:48 ` [PATCH 28/31] tools, perf: Add a precise event qualifier Andi Kleen
2012-10-02 23:48 ` [PATCH 29/31] perf, x86: Add Haswell TSX event aliases Andi Kleen
2012-10-02 23:48 ` [PATCH 30/31] perf, tools: Add perf stat --transaction Andi Kleen
2012-10-02 23:48 ` [PATCH 31/31] perf, x86: Add a Haswell precise instructions event Andi Kleen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1349221731-15665-10-git-send-email-andi@firstfloor.org \
--to=andi@firstfloor.org \
--cc=a.p.zijlstra@chello.nl \
--cc=acme@redhat.com \
--cc=ak@linux.intel.com \
--cc=eranian@google.com \
--cc=jolsa@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=x86@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®