diff options
| author | Weston Andros Adamson <dros@netapp.com> | 2013-01-03 16:42:29 -0500 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2013-01-03 17:06:27 -0500 |
| commit | f8d9a897d4384b77f13781ea813156568f68b83e (patch) | |
| tree | c34e5e5b5da7a6c46d1d12b7408ef5312a55e8ca /fs/nfs/dir.c | |
| parent | d1c3ed669a2d452cacfb48c2d171a1f364dae2ed (diff) | |
| download | lwn-f8d9a897d4384b77f13781ea813156568f68b83e.tar.gz lwn-f8d9a897d4384b77f13781ea813156568f68b83e.zip | |
NFS: Fix access to suid/sgid executables
nfs_open_permission_mask() should only check MAY_EXEC for files that
are opened with __FMODE_EXEC.
Also fix NFSv4 access-in-open path in a similar way -- openflags must be
used because fmode will not always have FMODE_EXEC set.
This patch fixes https://bugzilla.kernel.org/show_bug.cgi?id=49101
Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'fs/nfs/dir.c')
| -rw-r--r-- | fs/nfs/dir.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 32e6c53520e2..1b2d7eb93796 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -2153,12 +2153,16 @@ static int nfs_open_permission_mask(int openflags) { int mask = 0; - if ((openflags & O_ACCMODE) != O_WRONLY) - mask |= MAY_READ; - if ((openflags & O_ACCMODE) != O_RDONLY) - mask |= MAY_WRITE; - if (openflags & __FMODE_EXEC) - mask |= MAY_EXEC; + if (openflags & __FMODE_EXEC) { + /* ONLY check exec rights */ + mask = MAY_EXEC; + } else { + if ((openflags & O_ACCMODE) != O_WRONLY) + mask |= MAY_READ; + if ((openflags & O_ACCMODE) != O_RDONLY) + mask |= MAY_WRITE; + } + return mask; } |