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Message-ID: <YDYzRoig7zUWAVZM@krava>
Date: Wed, 24 Feb 2021 12:06:46 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
LKML <linux-kernel@...r.kernel.org>,
Stephane Eranian <eranian@...gle.com>,
Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH] perf daemon: Fix compile error with Asan
On Wed, Feb 24, 2021 at 04:14:38PM +0900, Namhyung Kim wrote:
> I'm seeing a build failure when build with address sanitizer.
> It seems we could write to the name[100] if the var is longer.
>
> $ make EXTRA_CFLAGS=-fsanitize=address
> ...
> CC builtin-daemon.o
> In function ‘get_session_name’,
> inlined from ‘session_config’ at builtin-daemon.c:164:6,
> inlined from ‘server_config’ at builtin-daemon.c:223:10:
> builtin-daemon.c:155:11: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
> 155 | *session = 0;
> | ~~~~~~~~~^~~
> builtin-daemon.c: In function ‘server_config’:
> builtin-daemon.c:162:7: note: at offset 100 to object ‘name’ with size 100 declared here
> 162 | char name[100];
> | ^~~~
>
> Fixes: c0666261ff38 ("perf daemon: Add config file support")
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
Acked-by: Jiri Olsa <jolsa@...hat.com>
thanks,
jirka
> ---
> tools/perf/builtin-daemon.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
> index 617feaf020f6..8f9fc61691da 100644
> --- a/tools/perf/builtin-daemon.c
> +++ b/tools/perf/builtin-daemon.c
> @@ -161,7 +161,7 @@ static int session_config(struct daemon *daemon, const char *var, const char *va
> struct daemon_session *session;
> char name[100];
>
> - if (get_session_name(var, name, sizeof(name)))
> + if (get_session_name(var, name, sizeof(name) - 1))
> return -EINVAL;
>
> var = strchr(var, '.');
> --
> 2.30.0.617.g56c4b15f3c-goog
>
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