linux-kernel - Re: [tip:perf/core] perf: Fix broken union in ' struct perf_event_mmap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 18 Sep 2013 17:42:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vince Weaver <vince@...ter.net>
Cc:	mingo@...nel.org, hpa@...or.com, linux-kernel@...r.kernel.org,
	adrian.hunter@...el.com, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org, eranian@...glemail.com
Subject: Re: [tip:perf/core] perf: Fix broken union in ' struct
 perf_event_mmap_page'

On Wed, Sep 18, 2013 at 10:19:32AM -0400, Vince Weaver wrote:
> Can you point to any code that is fixed by the commit?

I have some, but I don't think a lot of people use it.

Would you be ok with something like the below? It should preserve
functionality for code that only cares about cap_usr_rdpmc (PAPI).

Stephane, does libpfm use any of these?

--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -380,8 +380,8 @@ struct perf_event_mmap_page {
 	union {
 		__u64	capabilities;
 		struct {
-			__u64	cap_usr_time		: 1,
-				cap_usr_rdpmc		: 1,
+			__u64	cap_usr_rdpmc		: 1,
+				cap_usr_time		: 1,
 				cap_usr_time_zero	: 1,
 				cap_____res		: 61;
 		};
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/