Re: [git pull] apparmor fix for __d_path() misuse

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Al Viro wrote:
> diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
> index 738bbdf..36fa7c9 100644
> --- a/security/tomoyo/realpath.c
> +++ b/security/tomoyo/realpath.c
> @@ -101,9 +101,8 @@ static char *tomoyo_get_absolute_path(struct path *path, char * const buffer,
>  {
>         char *pos = ERR_PTR(-ENOMEM);
>         if (buflen >= 256) {
> -               struct path ns_root = { };
>                 /* go to whatever namespace root we are under */
> -               pos = __d_path(path, &ns_root, buffer, buflen - 1);
> +               pos = d_absolute_path(path, buffer, buflen - 1);
>                 if (!IS_ERR(pos) && *pos == '/' && pos[1]) {
>                         struct inode *inode = path->dentry->d_inode;
>                         if (inode && S_ISDIR(inode->i_mode)) {

Currently, TOMOYO assumes that -ENAMETOOLONG is the only error which __d_path()
might return (and retries with larger buffer size unless kmalloc() fails).
If d_absolute_path() starts returning -EINVAL, TOMOYO will deny requests even
if "partial (I mean the result would have been different if reachable)"
pathname is granted by the policy.

How commonly can conditions that make d_absolute_path() return -EINVAL happen?



Linus Torvalds wrote:
> I don't know of any big distro that uses Tomoyo, so...
Ubuntu, Debian, OpenSUSE, ArchLinux, Mandriva...
Hope you know one of these distro. ;-)
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Ext4 Filesystem]     [Union Filesystem]     [Filesystem Testing]     [Ceph Users]     [Ecryptfs]     [AutoFS]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux Cachefs]     [Reiser Filesystem]     [Linux RAID]     [Samba]     [Device Mapper]     [CEPH Development]
  Powered by Linux