This is a note to let you know that I've just added the patch titled
perf/x86/intel/pt: Fix an off-by-one in address filter configuration
to the 4.7-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-intel-pt-fix-an-off-by-one-in-address-filter-configuration.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 95f60084acbcee6c466256cf26eb52191fad9edc Mon Sep 17 00:00:00 2001
From: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Date: Thu, 15 Sep 2016 18:13:50 +0300
Subject: perf/x86/intel/pt: Fix an off-by-one in address filter configuration
From: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
commit 95f60084acbcee6c466256cf26eb52191fad9edc upstream.
PT address filter configuration requires that a range is specified by
its first and last address, but at the moment we're obtaining the end
of the range by adding user specified size to its start, which is off
by one from what it actually needs to be.
Fix this and make sure that zero-sized filters don't pass the filter
validation.
Reported-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vince Weaver <vincent.weaver@xxxxxxxxx>
Cc: vince@xxxxxxxxxx
Link: http://lkml.kernel.org/r/20160915151352.21306-2-alexander.shishkin@xxxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/events/intel/pt.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -1081,7 +1081,7 @@ static int pt_event_addr_filters_validat
list_for_each_entry(filter, filters, entry) {
/* PT doesn't support single address triggers */
- if (!filter->range)
+ if (!filter->range || !filter->size)
return -EOPNOTSUPP;
if (!filter->inode && !kernel_ip(filter->offset))
@@ -1111,7 +1111,7 @@ static void pt_event_addr_filters_sync(s
} else {
/* apply the offset */
msr_a = filter->offset + offs[range];
- msr_b = filter->size + msr_a;
+ msr_b = filter->size + msr_a - 1;
}
filters->filter[range].msr_a = msr_a;
Patches currently in stable-queue which might be from alexander.shishkin@xxxxxxxxxxxxxxx are
queue-4.7/perf-x86-intel-pt-fix-an-off-by-one-in-address-filter-configuration.patch
queue-4.7/perf-x86-intel-fix-pebsv3-record-drain.patch
queue-4.7/perf-x86-intel-pt-do-validate-the-size-of-a-kernel-address-filter.patch
queue-4.7/perf-x86-intel-pt-fix-kernel-address-filter-s-offset-validation.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html