[PATCH 12/19] fs: Don't remove suid for CAP_FSETID in s_user_ns

[Serge E. Hallyn]

Quoting Seth Forshee (seth.forshee at canonical.com):
> Expand the check in should_remove_suid() to keep privileges for
> CAP_FSETID in s_user_ns rather than init_user_ns.
> 
> Signed-off-by: Seth Forshee <seth.forshee at canonical.com>

Acked-by: Serge Hallyn <serge.hallyn at canonical.com>

> ---
>  fs/inode.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/inode.c b/fs/inode.c
> index 01c036fe1950..3e7c74da9304 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -1684,7 +1684,8 @@ int should_remove_suid(struct dentry *dentry)
>  	if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
>  		kill |= ATTR_KILL_SGID;
>  
> -	if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode)))
> +	if (unlikely(kill && !ns_capable(dentry->d_sb->s_user_ns, CAP_FSETID) &&
> +		     S_ISREG(mode)))
>  		return kill;
>  
>  	return 0;
> -- 
> 1.9.1
> 
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