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| author |   Masahiro Yamada <masahiroy@kernel.org> | 2022-04-25 04:07:45 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2022-05-08 03:16:59 +0900 |
| commit | 15a28c7c72917f96820e9e9ccd113606363ba3ac (patch) | |
| tree | 491b81b105d4a0fad6acf8fc1aea033530302973 /scripts/mod/modpost.c | |
| parent | checksyscalls: ignore -Wunused-macros (diff) | |
| download | linux-dev-15a28c7c72917f96820e9e9ccd113606363ba3ac.tar.xz linux-dev-15a28c7c72917f96820e9e9ccd113606363ba3ac.zip | |
modpost: use snprintf() instead of sprintf() for safety
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>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Diffstat (limited to '')
| -rw-r--r-- | scripts/mod/modpost.c | 8 |
1 files changed, 7 insertions, 1 deletions
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); } |