Messages in this thread | | | From | Nick Desaulniers <> | Date | Mon, 25 Apr 2022 11:11:17 -0700 | Subject | Re: [PATCH 01/27] modpost: use snprintf() instead of sprintf() for safety |
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On Sun, Apr 24, 2022 at 12:09 PM Masahiro Yamada <masahiroy@kernel.org> wrote: > > Use snprintf() to avoid the potential buffer overflow, and also > check the return value to detect the too long path. > > Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Thanks for the patch! Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
> --- > > scripts/mod/modpost.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c > index 522d5249d196..141370ebbfd3 100644 > --- a/scripts/mod/modpost.c > +++ b/scripts/mod/modpost.c > @@ -2560,6 +2560,7 @@ int main(int argc, char **argv) > > for (mod = modules; mod; mod = mod->next) { > char fname[PATH_MAX]; > + int ret; > > if (mod->is_vmlinux || mod->from_dump) > continue; > @@ -2578,7 +2579,12 @@ int main(int argc, char **argv) > add_moddevtable(&buf, mod); > add_srcversion(&buf, mod); > > - sprintf(fname, "%s.mod.c", mod->name); > + ret = snprintf(fname, sizeof(fname), "%s.mod.c", mod->name); > + if (ret >= sizeof(fname)) { > + error("%s: too long path was truncated\n", fname); > + continue; > + } > + > write_if_changed(&buf, fname); > } > > -- > 2.32.0 >
-- Thanks, ~Nick Desaulniers
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