lkml.org 
[lkml]   [2020]   [Aug]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/2] exec: Restore EACCES of S_ISDIR execve()
On Thu, Aug 13, 2020 at 04:17:22PM -0700, Kees Cook wrote:
> The return code for attempting to execute a directory has always been
> EACCES. Adjust the S_ISDIR exec test to reflect the old errno instead
> of the general EISDIR for other kinds of "open" attempts on directories.
>
> Reported-by: Marc Zyngier <maz@kernel.org>
> Link: https://lore.kernel.org/lkml/20200813151305.6191993b@why
> Fixes: 633fb6ac3980 ("exec: move S_ISREG() check earlier")
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> fs/namei.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/fs/namei.c b/fs/namei.c
> index 2112e578dccc..e99e2a9da0f7 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -2849,8 +2849,10 @@ static int may_open(const struct path *path, int acc_mode, int flag)
> case S_IFLNK:
> return -ELOOP;
> case S_IFDIR:
> - if (acc_mode & (MAY_WRITE | MAY_EXEC))
> + if (acc_mode & MAY_WRITE)
> return -EISDIR;
> + if (acc_mode & MAY_EXEC)
> + return -EACCES;
> break;
> case S_IFBLK:
> case S_IFCHR:


Reviewed-by: Greg Kroah-Hartman <gregkh@google.com>

\
 
 \ /
  Last update: 2020-08-14 09:11    [W:0.041 / U:0.424 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site