From: Shawn Landden <slandden@gmail.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Clark Williams <williams@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Adrian Hunter <adrian.hunter@intel.com>,
Jiri Olsa <jolsa@redhat.com>, Wang Nan <wangnan0@huawei.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: [PATCH 05/44] perf data: Fix 'strncat may truncate' build failure with recent gcc
Date: Mon, 27 May 2019 17:46:26 -0500 [thread overview]
Message-ID: <CA+49okqviNfP087Z34-P4mJuMYc8_PiNJgTPz0xSAxqtp4iM0A@mail.gmail.com> (raw)
In-Reply-To: <20190527223730.11474-6-acme@kernel.org>
On Mon, May 27, 2019 at 5:38 PM Arnaldo Carvalho de Melo
<acme@kernel.org> wrote:
>
> From: Shawn Landden <shawn@git.icu>
>
> 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@git.icu>
> Cc: Adrian Hunter <adrian.hunter@intel.com>
> Cc: Jiri Olsa <jolsa@redhat.com>
> Cc: Namhyung Kim <namhyung@kernel.org>
> Cc: Wang Nan <wangnan0@huawei.com>
> LPU-Reference: 20190518183238.10954-1-shawn@git.icu
> Link: https://lkml.kernel.org/n/tip-289f1jice17ta7tr3tstm9jm@git.kernel.org
> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
> ---
> 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 e0311c9750ad..9097543a818b 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);
I took care to have enough context in my patch that you could see what
was going on. I wonder if there is a way to make that care
propate when people add Signed-off-by: lines.
> p += 3;
> }
> }
> --
> 2.20.1
>
next prev parent reply other threads:[~2019-05-27 22:46 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-27 22:36 [GIT PULL] perf/urgent improvements and fixes Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 01/44] perf-with-kcore.sh: Always allow fix_buildid_cache_permissions Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 02/44] perf intel-pt: Fix itrace defaults for perf script Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 03/44] perf auxtrace: " Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 04/44] perf intel-pt: Fix itrace defaults for perf script intel-pt documentation Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 05/44] perf data: Fix 'strncat may truncate' build failure with recent gcc Arnaldo Carvalho de Melo
2019-05-27 22:46 ` Shawn Landden [this message]
2019-05-28 13:04 ` Arnaldo Carvalho de Melo
2019-05-28 16:59 ` Shawn Landden
2019-05-28 17:39 ` Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 06/44] perf arm64: Fix mksyscalltbl when system kernel headers are ahead of the kernel Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 07/44] tools include UAPI: Update copy of files related to new fspick, fsmount, fsconfig, fsopen, move_mount and open_tree syscalls Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 08/44] perf augmented_raw_syscalls: Fix up comment Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 09/44] perf beauty: Add generator for 'move_mount' flags argument Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 10/44] perf trace: Beautify 'move_mount' arguments Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 11/44] perf beauty: Add generator for fspick's 'flags' arg values Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 12/44] perf trace: Beautify 'fspick' arguments Arnaldo Carvalho de Melo
2019-05-27 22:36 ` [PATCH 13/44] perf beauty: Add generator for fsconfig's 'cmd' arg values Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 14/44] perf trace: Beautify 'fsconfig' arguments Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 15/44] perf beauty: Add generator for fsmount's 'attr_flags' arg values Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 16/44] perf trace: Introduce syscall_arg__scnprintf_strarray_flags Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 17/44] perf trace: Beautify 'fsmount' arguments Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 18/44] tools arch x86: Sync asm/cpufeatures.h with the with the kernel Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 19/44] tools headers UAPI: Sync linux/sched.h " Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 20/44] perf trace beauty clone: Handle CLONE_PIDFD Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 21/44] tools headers UAPI: Sync linux/fs.h with the kernel Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 22/44] perf beauty: Add generator for sync_file_range's 'flags' arg values Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 23/44] perf trace: Beautify 'sync_file_range' arguments Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 24/44] tools headers UAPI: Sync drm/i915_drm.h with the kernel Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 25/44] tools headers UAPI: Sync drm/drm.h " Arnaldo Carvalho de Melo
2019-05-28 3:17 ` Zhou, David(ChunMing)
2019-05-28 8:07 ` Lionel Landwerlin
2019-05-28 12:53 ` Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 26/44] perf namespace: Protect reading thread's namespace Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 27/44] perf session: Add missing swap ops for namespace events Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 28/44] perf top: Add --namespaces option Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 29/44] perf tools: Remove const from thread read accessors Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 30/44] perf dso: Separate generic code in dso__data_file_size() Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 31/44] perf dso: Separate generic code in dso_cache__read Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 32/44] perf dso: Simplify dso_cache__read function Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 33/44] perf dso: Add BPF DSO read and size hooks Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 34/44] perf test vmlinux-kallsyms: Ignore aliases to _etext when searching on kallsyms Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 35/44] perf machine: Read also the end of the kernel Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 36/44] perf machine: Keep zero in pgoff BPF map Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 37/44] perf tools: Preserve eBPF maps when loading kcore Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 38/44] perf script: Pad DSO name for --call-trace Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 39/44] perf tests: Add map_groups__merge_in test Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 40/44] perf script: Add --show-bpf-events to show eBPF related events Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 41/44] perf script: Remove superfluous BPF event titles Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 42/44] perf version: Append 12 git SHA chars to the version string Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 43/44] perf record: Fix s390 missing module symbol and warning for non-root users Arnaldo Carvalho de Melo
2019-05-27 22:37 ` [PATCH 44/44] tools headers UAPI: Sync kvm.h headers with the kernel sources Arnaldo Carvalho de Melo
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