On Sun, Apr 7, 2013 at 1:38 PM, Chen Gang <[email protected]> wrote:
> ownername and namebuf are all NUL terminated string.
>
> need always let them ended by '\0'.
>
> Signed-off-by: Chen Gang <[email protected]>
> ---
> kernel/module.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/module.c b/kernel/module.c
> index 3c2c72d..597efd8 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -3464,7 +3464,7 @@ const char *module_address_lookup(unsigned long addr,
> }
> /* Make a copy in here where it's safe */
> if (ret) {
> - strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
> + strlcpy(namebuf, ret, KSYM_NAME_LEN);
> ret = namebuf;
> }
> preempt_enable();
Is this buffer ever copied to userspace?
If yes, it may leak innocent kernel stack to userspace, as strlcpy()
doesn't fill
the remaining of the buffer with zeroes, while strncpy() does.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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