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Date: Thu, 20 Jun 2019 19:57:33 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Shawn Landden <shawn@....icu>, Adrian Hunter <adrian.hunter@...el.com>, Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>, Wang Nan <wangnan0@...wei.com>, Arnaldo Carvalho de Melo <acme@...hat.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.1 66/98] perf data: Fix strncat may truncate build failure with recent gcc [ Upstream commit 97acec7df172cd1e450f81f5e293c0aa145a2797 ] This strncat() is safe because the buffer was allocated with zalloc(), however gcc doesn't know that. Since the string always has 4 non-null bytes, just use memcpy() here. CC /home/shawn/linux/tools/perf/util/data-convert-bt.o In file included from /usr/include/string.h:494, from /home/shawn/linux/tools/lib/traceevent/event-parse.h:27, from util/data-convert-bt.c:22: In function ‘strncat’, inlined from ‘string_set_value’ at util/data-convert-bt.c:274:4: /usr/include/powerpc64le-linux-gnu/bits/string_fortified.h:136:10: error: ‘__builtin_strncat’ output may be truncated copying 4 bytes from a string of length 4 [-Werror=stringop-truncation] 136 | return __builtin___strncat_chk (__dest, __src, __len, __bos (__dest)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Signed-off-by: Shawn Landden <shawn@....icu> Cc: Adrian Hunter <adrian.hunter@...el.com> Cc: Jiri Olsa <jolsa@...hat.com> Cc: Namhyung Kim <namhyung@...nel.org> Cc: Wang Nan <wangnan0@...wei.com> LPU-Reference: 20190518183238.10954-1-shawn@....icu Link: https://lkml.kernel.org/n/tip-289f1jice17ta7tr3tstm9jm@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- tools/perf/util/data-convert-bt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c index 26af43ad9ddd..53d49fd8b8ae 100644 --- a/tools/perf/util/data-convert-bt.c +++ b/tools/perf/util/data-convert-bt.c @@ -271,7 +271,7 @@ static int string_set_value(struct bt_ctf_field *field, const char *string) if (i > 0) strncpy(buffer, string, i); } - strncat(buffer + p, numstr, 4); + memcpy(buffer + p, numstr, 4); p += 3; } } -- 2.20.1
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