This is a note to let you know that I've just added the patch titled
perf annotate: Fix objdump comment parsing for Intel mov dissassembly
to the 4.15-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-annotate-fix-objdump-comment-parsing-for-intel-mov-dissassembly.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Fri Mar 16 15:11:07 CET 2018
From: Thomas Richter <tmricht@xxxxxxxxxxxxxxxxxx>
Date: Tue, 28 Nov 2017 08:56:32 +0100
Subject: perf annotate: Fix objdump comment parsing for Intel mov dissassembly
From: Thomas Richter <tmricht@xxxxxxxxxxxxxxxxxx>
[ Upstream commit 35a8a148d8c1ee9e5ae18f9565a880490f816f89 ]
The command 'perf annotate' parses the output of objdump and also
investigates the comments produced by objdump. For example the
output of objdump produces (on x86):
23eee: 4c 8b 3d 13 01 21 00 mov 0x210113(%rip),%r15
# 234008 <stderr@@GLIBC_2.2.5+0x9a8>
and the function mov__parse() is called to investigate the complete
line. Mov__parse() breaks this line into several parts and finally
calls function comment__symbol() to parse the data after the comment
character '#'. Comment__symbol() expects a hexadecimal address followed
by a symbol in '<' and '>' brackets.
However the 2nd parameter given to function comment__symbol()
always points to the comment character '#'. The address parsing
always returns 0 because the character '#' is not a digit and
strtoull() fails without being noticed.
Fix this by advancing the second parameter to function comment__symbol()
by one byte before invocation and add an error check after strtoull()
has been called.
Signed-off-by: Thomas Richter <tmricht@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Hendrik Brueckner <brueckner@xxxxxxxxxxxxxxxxxx>
Acked-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Fixes: 6de783b6f50f ("perf annotate: Resolve symbols using objdump comment")
Link: http://lkml.kernel.org/r/20171128075632.72182-1-tmricht@xxxxxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
tools/perf/util/annotate.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -322,6 +322,8 @@ static int comment__symbol(char *raw, ch
return 0;
*addrp = strtoull(comment, &endptr, 16);
+ if (endptr == comment)
+ return 0;
name = strchr(endptr, '<');
if (name == NULL)
return -1;
@@ -435,8 +437,8 @@ static int mov__parse(struct arch *arch,
return 0;
comment = ltrim(comment);
- comment__symbol(ops->source.raw, comment, &ops->source.addr, &ops->source.name);
- comment__symbol(ops->target.raw, comment, &ops->target.addr, &ops->target.name);
+ comment__symbol(ops->source.raw, comment + 1, &ops->source.addr, &ops->source.name);
+ comment__symbol(ops->target.raw, comment + 1, &ops->target.addr, &ops->target.name);
return 0;
@@ -480,7 +482,7 @@ static int dec__parse(struct arch *arch
return 0;
comment = ltrim(comment);
- comment__symbol(ops->target.raw, comment, &ops->target.addr, &ops->target.name);
+ comment__symbol(ops->target.raw, comment + 1, &ops->target.addr, &ops->target.name);
return 0;
}
Patches currently in stable-queue which might be from tmricht@xxxxxxxxxxxxxxxxxx are
queue-4.15/perf-annotate-fix-unnecessary-memory-allocation-for-s390x.patch
queue-4.15/perf-annotate-fix-objdump-comment-parsing-for-intel-mov-dissassembly.patch