linux-kernel - [tip: perf/urgent] perf test: Fix test trace+probe_vfs

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Message-ID: <158272683942.28353.13346247455892179046.tip-bot2@tip-bot2>
Date:   Wed, 26 Feb 2020 14:20:39 -0000
From:   "tip-bot2 for Thomas Richter" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Richter <tmricht@...ux.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Sumanth Korikkar <sumanthk@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: perf/urgent] perf test: Fix test trace+probe_vfs_getname.sh on s390

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     2bbc83537614517730e9f2811195004b712de207
Gitweb:        https://git.kernel.org/tip/2bbc83537614517730e9f2811195004b712de207
Author:        Thomas Richter <tmricht@...ux.ibm.com>
AuthorDate:    Mon, 17 Feb 2020 11:21:11 +01:00
Committer:     Arnaldo Carvalho de Melo <acme@...hat.com>
CommitterDate: Tue, 18 Feb 2020 10:13:28 -03:00

perf test: Fix test trace+probe_vfs_getname.sh on s390

This test places a kprobe to function getname_flags() in the kernel
which has the following prototype:

  struct filename *getname_flags(const char __user *filename, int flags, int *empty)

The 'filename' argument points to a filename located in user space memory.

Looking at commit 88903c464321c ("tracing/probe: Add ustring type for
user-space string") the kprobe should indicate that user space memory is
accessed.

Output before:

   [root@...lp76 perf]# ./perf test 66 67
   66: Use vfs_getname probe to get syscall args filenames   : FAILED!
   67: Check open filename arg using perf trace + vfs_getname: FAILED!
   [root@...lp76 perf]#

Output after:

   [root@...lp76 perf]# ./perf test 66 67
   66: Use vfs_getname probe to get syscall args filenames   : Ok
   67: Check open filename arg using perf trace + vfs_getname: Ok
   [root@...lp76 perf]#

Comments from Masami Hiramatsu:

This bug doesn't happen on x86 or other archs on which user address
space and kernel address space is the same. On some arches (ppc64 in
this case?) user address space is partially or completely the same as
kernel address space.

(Yes, they switch the world when running into the kernel) In this case,
we need to use different data access functions for each space.

That is why I introduced the "ustring" type for kprobe events.

As far as I can see, Thomas's patch is sane. Thomas, could you show us
your result on your test environment?

Comments from Thomas Richter:

Test results for s/390 included above.

Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Heiko Carstens <heiko.carstens@...ibm.com>
Cc: Sumanth Korikkar <sumanthk@...ux.ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Link: http://lore.kernel.org/lkml/20200217102111.61137-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/tests/shell/lib/probe_vfs_getname.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/tests/shell/lib/probe_vfs_getname.sh b/tools/perf/tests/shell/lib/probe_vfs_getname.sh
index 7cb99b4..c2cc42d 100644
--- a/tools/perf/tests/shell/lib/probe_vfs_getname.sh
+++ b/tools/perf/tests/shell/lib/probe_vfs_getname.sh
@@ -14,7 +14,7 @@ add_probe_vfs_getname() {
 	if [ $had_vfs_getname -eq 1 ] ; then
 		line=$(perf probe -L getname_flags 2>&1 | egrep 'result.*=.*filename;' | sed -r 's/[[:space:]]+([[:digit:]]+)[[:space:]]+result->uptr.*/\1/')
 		perf probe -q       "vfs_getname=getname_flags:${line} pathname=result->name:string" || \
-		perf probe $verbose "vfs_getname=getname_flags:${line} pathname=filename:string"
+		perf probe $verbose "vfs_getname=getname_flags:${line} pathname=filename:ustring"
 	fi
 }