| Message ID | 20230510212457.3491385-1-azeemshaikh38@gmail.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere, archived |
| Headers | show |
| Series | procfs: Replace all non-returning strlcpy with strscpy | expand |
On Wed, May 10, 2023 at 09:24:57PM +0000, Azeem Shaikh wrote: > 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]. > In an effort to remove strlcpy() completely [2], replace > strlcpy() here with strscpy(). > No return values were used, so 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> Reviewed-by: Kees Cook <keescook@chromium.org>
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c index 25b44b303b35..5d0cf59c4926 100644 --- a/fs/proc/kcore.c +++ b/fs/proc/kcore.c @@ -419,7 +419,7 @@ static ssize_t read_kcore_iter(struct kiocb *iocb, struct iov_iter *iter) char *notes; size_t i = 0; - strlcpy(prpsinfo.pr_psargs, saved_command_line, + strscpy(prpsinfo.pr_psargs, saved_command_line, sizeof(prpsinfo.pr_psargs)); notes = kzalloc(notes_len, GFP_KERNEL);
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]. In an effort to remove strlcpy() completely [2], replace strlcpy() here with strscpy(). No return values were used, so 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> --- fs/proc/kcore.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)