Commit-ID: 95f60084acbcee6c466256cf26eb52191fad9edc Gitweb: http://git.kernel.org/tip/95f60084acbcee6c466256cf26eb52191fad9edc Author: Alexander Shishkin <[email protected]> AuthorDate: Thu, 15 Sep 2016 18:13:50 +0300 Committer: Ingo Molnar <[email protected]> CommitDate: Fri, 16 Sep 2016 11:14:16 +0200
perf/x86/intel/pt: Fix an off-by-one in address filter configuration 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 <[email protected]> Signed-off-by: Alexander Shishkin <[email protected]> Acked-by: Peter Zijlstra <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Stephane Eranian <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Vince Weaver <[email protected]> Cc: [email protected] # v4.7 Cc: [email protected]#v4.7 Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/events/intel/pt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c index 04bb5fb..5ec0100 100644 --- a/arch/x86/events/intel/pt.c +++ b/arch/x86/events/intel/pt.c @@ -1081,7 +1081,7 @@ static int pt_event_addr_filters_validate(struct list_head *filters) 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(struct perf_event *event) } 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;
