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SubjectRe: [PATCH] selinux: check CAP_SETFCAP for a particular inode & mapped user
On Thu, Oct 05, 2017 at 08:16:11AM +0200, Lubomir Rintel wrote:
> This allows setting "security.capability" xattr by a user that has
> CAP_SETFCAP in an userns with SELinux. Namespaced capabilities are
> supported, as of commit 8db6c34f1dbc ("Introduce v3 namespaced file
> capabilities").
>
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

The fix is already on its way into the kernel - see the thread at
https://marc.info/?l=selinux&m=150713903925728&w=2

Thanks though :)

-serge

> ---
> A casual warning: Please not assume I know what I'm really doing. I can now
> install iputils and /bin/ping in a LXC container, which is great, but I
> typically wouldn't be allowed anywhere near anything security related.
>
> Thank you!
>
> security/selinux/hooks.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index f5d304736852..7bc5f4ffb4e0 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -3127,11 +3127,12 @@ static int selinux_inode_getattr(const struct path *path)
> static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name)
> {
> const struct cred *cred = current_cred();
> + struct inode *inode = d_backing_inode(dentry);
>
> if (!strncmp(name, XATTR_SECURITY_PREFIX,
> sizeof XATTR_SECURITY_PREFIX - 1)) {
> if (!strcmp(name, XATTR_NAME_CAPS)) {
> - if (!capable(CAP_SETFCAP))
> + if (!capable_wrt_inode_uidgid(inode, CAP_SETFCAP))
> return -EPERM;
> } else if (!capable(CAP_SYS_ADMIN)) {
> /* A different attribute in the security namespace.
> --
> 2.13.6

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