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Andrey Zhizhikin bad8bb7a59 tools lib api fs: Fix gcc9 stringop-truncation compilation error 
[ Upstream commit 6794200fa3 ]

GCC9 introduced string hardening mechanisms, which exhibits the error
during fs api compilation:

error: '__builtin_strncpy' specified bound 4096 equals destination size
[-Werror=stringop-truncation]

This comes when the length of copy passed to strncpy is is equal to
destination size, which could potentially lead to buffer overflow.

There is a need to mitigate this potential issue by limiting the size of
destination by 1 and explicitly terminate the destination with NULL.

Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andriin@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: bpf@vger.kernel.org
Cc: netdev@vger.kernel.org
Link: http://lore.kernel.org/lkml/20191211080109.18765-1-andrey.zhizhikin@leica-geosystems.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-02-24 08:34:45 +01:00
..
api tools lib api fs: Fix gcc9 stringop-truncation compilation error 2020-02-24 08:34:45 +01:00
bpf libbpf: Fix error handling in bpf_map__reuse_fd() 2019-12-31 16:35:33 +01:00
lockdep tools lib traceevent, tools lib lockdep: Rename 'enum pevent_errno' to 'enum tep_errno' 2018-08-13 15:23:07 -03:00
subcmd libsubcmd: Use -O0 with DEBUG=1 2019-12-31 16:35:47 +01:00
symbol tools lib symbols: Introduce kallsyms__is_function() 2018-04-26 13:47:14 -03:00
traceevent tools lib traceevent: Fix memory leakage in filter_event 2020-02-05 14:43:41 +00:00
bitmap.c
find_bit.c
hweight.c
rbtree.c
str_error_r.c objtool, perf: Fix GCC 8 -Wrestrict error 2018-03-19 13:51:54 -03:00
string.c tools lib: Fix builds when glibc contains strlcpy() 2020-02-05 14:43:34 +00:00
vsprintf.c