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bpf: Replace all non-returning strlcpy with strscpy

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strlcpy() reads the entire source buffer first. This read may exceed the
destination size limit. This is both inefficient and can lead to linear
read overflows if a source string is not NUL-terminated [1]. This is not
the case here, however, in an effort to remove strlcpy() completely [2],
lets replace strlcpy() here with strscpy(). No return values were used,
so a direct replacement is safe.

  [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
  [2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/bpf/20230530155659.309657-1-azeemshaikh38@gmail.com
This commit is contained in:
Azeem Shaikh 2023-05-30 15:56:59 +00:00 committed by Daniel Borkmann
parent 0d2da4b595
commit ffadc37252
1 changed files with 2 additions and 2 deletions
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4
kernel/bpf/preload/bpf_preload_kern.c
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@ -23,9 +23,9 @@ static void free_links_and_skel(void)
static int preload(struct bpf_preload_info *obj)
{
strlcpy(obj[0].link_name, "maps.debug", sizeof(obj[0].link_name));
strscpy(obj[0].link_name, "maps.debug", sizeof(obj[0].link_name));
obj[0].link = maps_link;
strlcpy(obj[1].link_name, "progs.debug", sizeof(obj[1].link_name));
strscpy(obj[1].link_name, "progs.debug", sizeof(obj[1].link_name));
obj[1].link = progs_link;
return 0;
}