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    SubjectRe: [RFC] c/r: prctl: Add ability to set new mm_struct::exe_file v3
    On Thu, Mar 08, 2012 at 12:24:38PM -0800, Andy Lutomirski wrote:
    >
    > nnp is no_new_privs, which is my patch and is almost, but not quite,
    > very relevant to this discussion. Hence my confusion ;)
    >
    > FWIW, since I've touched this code recently, the cleanup you're
    > suggesting sounds good.
    >

    Andy, Kees, I guess the patch below might be a helper we need,
    while I'm not sure on naming. hm?

    Cyrill
    ---
    include/linux/fs.h | 6 ++++++
    1 file changed, 6 insertions(+)

    Index: linux-2.6.git/include/linux/fs.h
    ===================================================================
    --- linux-2.6.git.orig/include/linux/fs.h
    +++ linux-2.6.git/include/linux/fs.h
    @@ -2669,5 +2669,11 @@ static inline void inode_has_no_xattr(st
    inode->i_flags |= S_NOSEC;
    }

    +static inline bool file_may_exec(struct file *f)
    +{
    + return S_ISREG(f->f_path.dentry->d_inode->i_mode) &&
    + !(f->f_path.mnt->mnt_flags & MNT_NOEXEC);
    +}
    +
    #endif /* __KERNEL__ */
    #endif /* _LINUX_FS_H */

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