On Fri, Oct 18, 2019 at 02:39:01PM +0200, Javier Martinez Canillas wrote:
> From: Hector Marco-Gisbert <hecma...@upv.es>
>
> This patch fixes two integer underflows at:
> * grub-core/lib/crypto.c
> * grub-core/normal/auth.c
>
> Resolves: CVE-2015-8370
>
> Signed-off-by: Hector Marco-Gisbert <hecma...@upv.es>
> Signed-off-by: Ismael Ripoll-Ripoll <irip...@disca.upv.es>
> Signed-off-by: Javier Martinez Canillas <javi...@redhat.com>
> ---
>
> grub-core/lib/crypto.c | 2 +-
> grub-core/normal/auth.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/grub-core/lib/crypto.c b/grub-core/lib/crypto.c
> index ca334d5a40e..e6c78d16d39 100644
> --- a/grub-core/lib/crypto.c
> +++ b/grub-core/lib/crypto.c
> @@ -468,7 +468,7 @@ grub_password_get (char buf[], unsigned buf_size)
> break;
> }
>
> - if (key == '\b')
> + if (key == '\b' && cur_len)
> {
> if (cur_len)
> cur_len--;
> diff --git a/grub-core/normal/auth.c b/grub-core/normal/auth.c
> index 6be678c0de1..c35ce972473 100644
> --- a/grub-core/normal/auth.c
> +++ b/grub-core/normal/auth.c
> @@ -172,7 +172,7 @@ grub_username_get (char buf[], unsigned buf_size)
> break;
> }
>
> - if (key == GRUB_TERM_BACKSPACE)
> + if (key == GRUB_TERM_BACKSPACE && cur_len)
> {
> if (cur_len)
> {
TBH, I do not understand how this patch helps. It only delays continue
execution to the next "if (!grub_isprint (key))" if cur_len == 0.
Daniel
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