lkml.org 
[lkml]   [2007]   [Jan]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    SubjectRe: [PATCH -mm 7/8] user_ns: handle file sigio
    On Thu, 4 Jan 2007 12:12:57 -0600
    "Serge E. Hallyn" <serue@us.ibm.com> wrote:

    > A process in one user namespace could set a fowner and sigio on a file in a
    > shared vfsmount, ending up killing a task in another user namespace.
    >
    > Prevent this by adding a user namespace pointer to the fown_struct, and
    > enforcing that a process causing a signal to be sent be in the same
    > user namespace as the file owner.

    This patch breaks the X server (stock FC5 install) with CONFIG_USER_NS=n.
    Neither the USB mouse nor the trackpad work. They work OK under GPM.

    Setting CONFIG_USER_NS=y "fixes" this. This bug was not observed in
    2.6.20-rc3-mm1 because that kernel had user-ns-always-on.patch for other
    reasons. (I'll restore that patch).

    There's nothing very interesting here:


    sony:/home/akpm> diff -u Xorg.0.log.good Xorg.0.log.bad
    --- Xorg.0.log.good 2007-01-11 21:11:11.000000000 -0800
    +++ Xorg.0.log.bad 2007-01-11 21:17:31.000000000 -0800
    @@ -6,7 +6,7 @@
    Release Date: 21 December 2005
    X Protocol Version 11, Revision 0, Release 7.0
    Build Operating System:Linux 2.6.9-22.18.bz155725.ELsmp i686Red Hat, Inc.
    -Current Operating System: Linux sony 2.6.20-rc4-mm1 #15 Thu Jan 11 21:07:58 PST 2007 i686
    +Current Operating System: Linux sony 2.6.20-rc4-mm1 #16 Thu Jan 11 21:14:03 PST 2007 i686
    Build Date: 22 March 2006
    Before reporting problems, check http://wiki.x.org
    to make sure that you have the latest version.
    @@ -14,7 +14,7 @@
    Markers: (--) probed, (**) from config file, (==) default setting,
    (++) from command line, (!!) notice, (II) informational,
    (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
    -(==) Log file: "/var/log/Xorg.0.log", Time: Thu Jan 11 21:10:16 2007
    +(==) Log file: "/var/log/Xorg.0.log", Time: Thu Jan 11 21:16:39 2007
    (==) Using config file: "/etc/X11/xorg.conf"
    (==) ServerLayout "single head configuration"
    (**) |-->Screen "Screen0" (0)
    @@ -2117,9 +2117,9 @@
    (II) I810(0): Allocated 128 kB for the ring buffer at 0x0
    (II) I810(0): Allocating at least 256 scanlines for pixmap cache
    (II) I810(0): Initial framebuffer allocation size: 12288 kByte
    -(II) I810(0): Allocated 4 kB for HW cursor at 0xffff000 (0x35dd3000)
    -(II) I810(0): Allocated 16 kB for HW (ARGB) cursor at 0xfffb000 (0x35e78000)
    -(II) I810(0): Allocated 4 kB for Overlay registers at 0xfffa000 (0x35e39000).
    +(II) I810(0): Allocated 4 kB for HW cursor at 0xffff000 (0x358d5000)
    +(II) I810(0): Allocated 16 kB for HW (ARGB) cursor at 0xfffb000 (0x35888000)
    +(II) I810(0): Allocated 4 kB for Overlay registers at 0xfffa000 (0x358d7000).
    (II) I810(0): Allocated 64 kB for the scratch buffer at 0xffea000
    drmOpenDevice: node name is /dev/dri/card0
    drmOpenDevice: open result is -1, (No such device or address)
    @@ -2137,8 +2137,8 @@
    (II) I810(0): [drm] loaded kernel module for "i915" driver
    (II) I810(0): [drm] DRM interface version 1.3
    (II) I810(0): [drm] created "i915" driver at busid "pci:0000:00:02.0"
    -(II) I810(0): [drm] added 8192 byte SAREA at 0xf8e46000
    -(II) I810(0): [drm] mapped SAREA 0xf8e46000 to 0xb7eec000
    +(II) I810(0): [drm] added 8192 byte SAREA at 0xf8d4a000
    +(II) I810(0): [drm] mapped SAREA 0xf8d4a000 to 0xb7f23000
    (II) I810(0): [drm] framebuffer handle = 0xc0020000
    (II) I810(0): [drm] added 1 reserved context for kernel
    (II) I810(0): Allocated 32 kB for the logical context at 0xffe2000.
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/
    \
     
     \ /
      Last update: 2007-01-12 06:55    [W:4.223 / U:0.328 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site