[kernel/f15] CVE-2011-4127 possible privilege escalation via SG_IO ioctl (rhbz 769911)
Josh Boyer
jwboyer at fedoraproject.org
Tue Jan 17 21:44:04 UTC 2012
commit 94aa5a9c602cf858122577453a596b5fc4d80717
Author: Josh Boyer <jwboyer at redhat.com>
Date: Tue Jan 17 15:30:50 2012 -0500
CVE-2011-4127 possible privilege escalation via SG_IO ioctl (rhbz 769911)
01-block-add-and-use-scsi_blk_cmd_ioctl.patch | 166 ++++++++++++++++++++
...SCSI-passthrough-ioctls-on-partition-devs.patch | 165 +++++++++++++++++++
...ont-fwd-ioctls-from-LVs-to-underlying-dev.patch | 91 +++++++++++
kernel.spec | 15 ++-
4 files changed, 436 insertions(+), 1 deletions(-)
---
diff --git a/01-block-add-and-use-scsi_blk_cmd_ioctl.patch b/01-block-add-and-use-scsi_blk_cmd_ioctl.patch
new file mode 100644
index 0000000..fdf4c50
--- /dev/null
+++ b/01-block-add-and-use-scsi_blk_cmd_ioctl.patch
@@ -0,0 +1,166 @@
+From 6051b3759d3d4b70d33a7be70ab6b86ed3559224 Mon Sep 17 00:00:00 2001
+From: Paolo Bonzini <pbonzini at redhat.com>
+Date: Mon, 16 Jan 2012 17:12:58 +0100
+Subject: [PATCH 1/3] block: add and use scsi_blk_cmd_ioctl
+
+Introduce a wrapper around scsi_cmd_ioctl that takes a block device.
+
+The function will then be enhanced to detect partition block devices
+and, in that case, subject the ioctls to whitelisting.
+
+[ Cherry picked from 6ad62f051ef784a48a6103af289f91b5c472e955 ]
+
+Cc: stable at kernel.org
+Cc: linux-scsi at vger.kernel.org
+Cc: Jens Axboe <axboe at kernel.dk>
+Cc: James Bottomley <JBottomley at parallels.com>
+Signed-off-by: Paolo Bonzini <pbonzini at redhat.com>
+Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
+---
+ block/scsi_ioctl.c | 7 +++++++
+ drivers/block/cciss.c | 6 +++---
+ drivers/block/ub.c | 3 +--
+ drivers/block/virtio_blk.c | 4 ++--
+ drivers/cdrom/cdrom.c | 3 +--
+ drivers/ide/ide-floppy_ioctl.c | 3 +--
+ drivers/scsi/sd.c | 2 +-
+ include/linux/blkdev.h | 2 ++
+ 8 files changed, 18 insertions(+), 12 deletions(-)
+
+diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
+index 4f4230b..57ac937 100644
+--- a/block/scsi_ioctl.c
++++ b/block/scsi_ioctl.c
+@@ -691,6 +691,13 @@ int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mod
+ }
+ EXPORT_SYMBOL(scsi_cmd_ioctl);
+
++int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
++ unsigned int cmd, void __user *arg)
++{
++ return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
++}
++EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
++
+ static int __init blk_scsi_ioctl_init(void)
+ {
+ blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
+diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
+index c2f9b3e..1dab802 100644
+--- a/drivers/block/cciss.c
++++ b/drivers/block/cciss.c
+@@ -1716,7 +1716,7 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
+ case CCISS_BIG_PASSTHRU:
+ return cciss_bigpassthru(h, argp);
+
+- /* scsi_cmd_ioctl handles these, below, though some are not */
++ /* scsi_cmd_blk_ioctl handles these, below, though some are not */
+ /* very meaningful for cciss. SG_IO is the main one people want. */
+
+ case SG_GET_VERSION_NUM:
+@@ -1727,9 +1727,9 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
+ case SG_EMULATED_HOST:
+ case SG_IO:
+ case SCSI_IOCTL_SEND_COMMAND:
+- return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, argp);
++ return scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
+
+- /* scsi_cmd_ioctl would normally handle these, below, but */
++ /* scsi_cmd_blk_ioctl would normally handle these, below, but */
+ /* they aren't a good fit for cciss, as CD-ROMs are */
+ /* not supported, and we don't have any bus/target/lun */
+ /* which we present to the kernel. */
+diff --git a/drivers/block/ub.c b/drivers/block/ub.c
+index 0e376d4..7333b9e 100644
+--- a/drivers/block/ub.c
++++ b/drivers/block/ub.c
+@@ -1744,12 +1744,11 @@ static int ub_bd_release(struct gendisk *disk, fmode_t mode)
+ static int ub_bd_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+ {
+- struct gendisk *disk = bdev->bd_disk;
+ void __user *usermem = (void __user *) arg;
+ int ret;
+
+ mutex_lock(&ub_mutex);
+- ret = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, usermem);
++ ret = scsi_cmd_blk_ioctl(bdev, mode, cmd, usermem);
+ mutex_unlock(&ub_mutex);
+
+ return ret;
+diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
+index 079c088..5d7a934 100644
+--- a/drivers/block/virtio_blk.c
++++ b/drivers/block/virtio_blk.c
+@@ -236,8 +236,8 @@ static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
+ if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
+ return -ENOTTY;
+
+- return scsi_cmd_ioctl(disk->queue, disk, mode, cmd,
+- (void __user *)data);
++ return scsi_cmd_blk_ioctl(bdev, mode, cmd,
++ (void __user *)data);
+ }
+
+ /* We provide getgeo only to please some old bootloader/partitioning tools */
+diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
+index f997c27..cedb231 100644
+--- a/drivers/cdrom/cdrom.c
++++ b/drivers/cdrom/cdrom.c
+@@ -2747,12 +2747,11 @@ int cdrom_ioctl(struct cdrom_device_info *cdi, struct block_device *bdev,
+ {
+ void __user *argp = (void __user *)arg;
+ int ret;
+- struct gendisk *disk = bdev->bd_disk;
+
+ /*
+ * Try the generic SCSI command ioctl's first.
+ */
+- ret = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, argp);
++ ret = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
+ if (ret != -ENOTTY)
+ return ret;
+
+diff --git a/drivers/ide/ide-floppy_ioctl.c b/drivers/ide/ide-floppy_ioctl.c
+index d267b7a..a22ca84 100644
+--- a/drivers/ide/ide-floppy_ioctl.c
++++ b/drivers/ide/ide-floppy_ioctl.c
+@@ -292,8 +292,7 @@ int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
+ * and CDROM_SEND_PACKET (legacy) ioctls
+ */
+ if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
+- err = scsi_cmd_ioctl(bdev->bd_disk->queue, bdev->bd_disk,
+- mode, cmd, argp);
++ err = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
+
+ if (err == -ENOTTY)
+ err = generic_ide_ioctl(drive, bdev, cmd, arg);
+diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
+index 953773c..c88885d 100644
+--- a/drivers/scsi/sd.c
++++ b/drivers/scsi/sd.c
+@@ -1095,7 +1095,7 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
+ error = scsi_ioctl(sdp, cmd, p);
+ break;
+ default:
+- error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
++ error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
+ if (error != -ENOTTY)
+ break;
+ error = scsi_ioctl(sdp, cmd, p);
+diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
+index 5e30b45..aa829a4 100644
+--- a/include/linux/blkdev.h
++++ b/include/linux/blkdev.h
+@@ -675,6 +675,8 @@ extern int blk_insert_cloned_request(struct request_queue *q,
+ struct request *rq);
+ extern void blk_delay_queue(struct request_queue *, unsigned long);
+ extern void blk_recount_segments(struct request_queue *, struct bio *);
++extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
++ unsigned int, void __user *);
+ extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
+ unsigned int, void __user *);
+ extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
+--
+1.7.7.5
+
diff --git a/02-block-fail-SCSI-passthrough-ioctls-on-partition-devs.patch b/02-block-fail-SCSI-passthrough-ioctls-on-partition-devs.patch
new file mode 100644
index 0000000..942e2a0
--- /dev/null
+++ b/02-block-fail-SCSI-passthrough-ioctls-on-partition-devs.patch
@@ -0,0 +1,165 @@
+From e773daff833c61e0ce22d62b7d1bb7b82f4222d0 Mon Sep 17 00:00:00 2001
+From: Paolo Bonzini <pbonzini at redhat.com>
+Date: Mon, 16 Jan 2012 17:12:59 +0100
+Subject: [PATCH 2/3] block: fail SCSI passthrough ioctls on partition devices
+
+Linux allows executing the SG_IO ioctl on a partition or LVM volume, and
+will pass the command to the underlying block device. This is
+well-known, but it is also a large security problem when (via Unix
+permissions, ACLs, SELinux or a combination thereof) a program or user
+needs to be granted access only to part of the disk.
+
+This patch lets partitions forward a small set of harmless ioctls;
+others are logged with printk so that we can see which ioctls are
+actually sent. In my tests only CDROM_GET_CAPABILITY actually occurred.
+Of course it was being sent to a (partition on a) hard disk, so it would
+have failed with ENOTTY and the patch isn't changing anything in
+practice. Still, I'm treating it specially to avoid spamming the logs.
+
+In principle, this restriction should include programs running with
+CAP_SYS_RAWIO. If for example I let a program access /dev/sda2 and
+/dev/sdb, it still should not be able to read/write outside the
+boundaries of /dev/sda2 independent of the capabilities. However, for
+now programs with CAP_SYS_RAWIO will still be allowed to send the
+ioctls. Their actions will still be logged.
+
+This patch does not affect the non-libata IDE driver. That driver
+however already tests for bd != bd->bd_contains before issuing some
+ioctl; it could be restricted further to forbid these ioctls even for
+programs running with CAP_SYS_ADMIN/CAP_SYS_RAWIO.
+
+[ Cherry picked from 3ed4e7ba4be8c72051d87dcb2dec279d97a18d41
+
+ Changes with respect to 3.3: return -ENOTTY from scsi_verify_blk_ioctl
+ and -ENOIOCTLCMD from sd_compat_ioctl. ]
+
+Cc: stable at kernel.org
+Cc: linux-scsi at vger.kernel.org
+Cc: Jens Axboe <axboe at kernel.dk>
+Cc: James Bottomley <JBottomley at parallels.com>
+Signed-off-by: Paolo Bonzini <pbonzini at redhat.com>
+[ Make it also print the command name when warning - Linus ]
+Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
+---
+ block/scsi_ioctl.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
+ drivers/scsi/sd.c | 11 +++++++++--
+ include/linux/blkdev.h | 1 +
+ 3 files changed, 55 insertions(+), 2 deletions(-)
+
+diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
+index 57ac937..5ef1f4c 100644
+--- a/block/scsi_ioctl.c
++++ b/block/scsi_ioctl.c
+@@ -24,6 +24,7 @@
+ #include <linux/capability.h>
+ #include <linux/completion.h>
+ #include <linux/cdrom.h>
++#include <linux/ratelimit.h>
+ #include <linux/slab.h>
+ #include <linux/times.h>
+ #include <asm/uaccess.h>
+@@ -691,9 +692,53 @@ int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mod
+ }
+ EXPORT_SYMBOL(scsi_cmd_ioctl);
+
++int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
++{
++ if (bd && bd == bd->bd_contains)
++ return 0;
++
++ /* Actually none of these is particularly useful on a partition,
++ * but they are safe.
++ */
++ switch (cmd) {
++ case SCSI_IOCTL_GET_IDLUN:
++ case SCSI_IOCTL_GET_BUS_NUMBER:
++ case SCSI_IOCTL_GET_PCI:
++ case SCSI_IOCTL_PROBE_HOST:
++ case SG_GET_VERSION_NUM:
++ case SG_SET_TIMEOUT:
++ case SG_GET_TIMEOUT:
++ case SG_GET_RESERVED_SIZE:
++ case SG_SET_RESERVED_SIZE:
++ case SG_EMULATED_HOST:
++ return 0;
++ case CDROM_GET_CAPABILITY:
++ /* Keep this until we remove the printk below. udev sends it
++ * and we do not want to spam dmesg about it. CD-ROMs do
++ * not have partitions, so we get here only for disks.
++ */
++ return -ENOTTY;
++ default:
++ break;
++ }
++
++ /* In particular, rule out all resets and host-specific ioctls. */
++ printk_ratelimited(KERN_WARNING
++ "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
++
++ return capable(CAP_SYS_RAWIO) ? 0 : -ENOTTY;
++}
++EXPORT_SYMBOL(scsi_verify_blk_ioctl);
++
+ int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
+ unsigned int cmd, void __user *arg)
+ {
++ int ret;
++
++ ret = scsi_verify_blk_ioctl(bd, cmd);
++ if (ret < 0)
++ return ret;
++
+ return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
+ }
+ EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
+diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
+index c88885d..7d8b5d8 100644
+--- a/drivers/scsi/sd.c
++++ b/drivers/scsi/sd.c
+@@ -1073,6 +1073,10 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
+ SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
+ disk->disk_name, cmd));
+
++ error = scsi_verify_blk_ioctl(bdev, cmd);
++ if (error < 0)
++ return error;
++
+ /*
+ * If we are in the middle of error recovery, don't let anyone
+ * else try and use this device. Also, if error recovery fails, it
+@@ -1265,6 +1269,11 @@ static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
+ unsigned int cmd, unsigned long arg)
+ {
+ struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
++ int ret;
++
++ ret = scsi_verify_blk_ioctl(bdev, cmd);
++ if (ret < 0)
++ return -ENOIOCTLCMD;
+
+ /*
+ * If we are in the middle of error recovery, don't let anyone
+@@ -1276,8 +1285,6 @@ static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
+ return -ENODEV;
+
+ if (sdev->host->hostt->compat_ioctl) {
+- int ret;
+-
+ ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
+
+ return ret;
+diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
+index aa829a4..8b7a19e 100644
+--- a/include/linux/blkdev.h
++++ b/include/linux/blkdev.h
+@@ -675,6 +675,7 @@ extern int blk_insert_cloned_request(struct request_queue *q,
+ struct request *rq);
+ extern void blk_delay_queue(struct request_queue *, unsigned long);
+ extern void blk_recount_segments(struct request_queue *, struct bio *);
++extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
+ extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
+ unsigned int, void __user *);
+ extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
+--
+1.7.7.5
+
diff --git a/03-dm-dont-fwd-ioctls-from-LVs-to-underlying-dev.patch b/03-dm-dont-fwd-ioctls-from-LVs-to-underlying-dev.patch
new file mode 100644
index 0000000..129edd9
--- /dev/null
+++ b/03-dm-dont-fwd-ioctls-from-LVs-to-underlying-dev.patch
@@ -0,0 +1,91 @@
+From bf50a5715cac3b85f3bd33f184f7c031debabe0b Mon Sep 17 00:00:00 2001
+From: Paolo Bonzini <pbonzini at redhat.com>
+Date: Mon, 16 Jan 2012 17:13:00 +0100
+Subject: [PATCH 3/3] dm: do not forward ioctls from logical volumes to the
+ underlying device
+
+A logical volume can map to just part of underlying physical volume.
+In this case, it must be treated like a partition.
+
+Based on a patch from Alasdair G Kergon.
+
+[ Cherry picked from 95113a17a2a1eb06151dc698dca9bcc4a29e4fbb ]
+
+Cc: stable at kernel.org
+Cc: Alasdair G Kergon <agk at redhat.com>
+Cc: dm-devel at redhat.com
+Cc: linux-scsi at vger.kernel.org
+Signed-off-by: Paolo Bonzini <pbonzini at redhat.com>
+Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
+---
+ drivers/md/dm-flakey.c | 11 ++++++++++-
+ drivers/md/dm-linear.c | 12 +++++++++++-
+ drivers/md/dm-mpath.c | 6 ++++++
+ 3 files changed, 27 insertions(+), 2 deletions(-)
+
+diff --git a/drivers/md/dm-flakey.c b/drivers/md/dm-flakey.c
+index f84c080..9fb18c1 100644
+--- a/drivers/md/dm-flakey.c
++++ b/drivers/md/dm-flakey.c
+@@ -368,8 +368,17 @@ static int flakey_status(struct dm_target *ti, status_type_t type,
+ static int flakey_ioctl(struct dm_target *ti, unsigned int cmd, unsigned long arg)
+ {
+ struct flakey_c *fc = ti->private;
++ struct dm_dev *dev = fc->dev;
++ int r = 0;
+
+- return __blkdev_driver_ioctl(fc->dev->bdev, fc->dev->mode, cmd, arg);
++ /*
++ * Only pass ioctls through if the device sizes match exactly.
++ */
++ if (fc->start ||
++ ti->len != i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT)
++ r = scsi_verify_blk_ioctl(NULL, cmd);
++
++ return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg);
+ }
+
+ static int flakey_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
+diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c
+index 3921e3b..9728839 100644
+--- a/drivers/md/dm-linear.c
++++ b/drivers/md/dm-linear.c
+@@ -116,7 +116,17 @@ static int linear_ioctl(struct dm_target *ti, unsigned int cmd,
+ unsigned long arg)
+ {
+ struct linear_c *lc = (struct linear_c *) ti->private;
+- return __blkdev_driver_ioctl(lc->dev->bdev, lc->dev->mode, cmd, arg);
++ struct dm_dev *dev = lc->dev;
++ int r = 0;
++
++ /*
++ * Only pass ioctls through if the device sizes match exactly.
++ */
++ if (lc->start ||
++ ti->len != i_size_read(dev->bdev->bd_inode) >> SECTOR_SHIFT)
++ r = scsi_verify_blk_ioctl(NULL, cmd);
++
++ return r ? : __blkdev_driver_ioctl(dev->bdev, dev->mode, cmd, arg);
+ }
+
+ static int linear_merge(struct dm_target *ti, struct bvec_merge_data *bvm,
+diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
+index 5e0090e..801d92d 100644
+--- a/drivers/md/dm-mpath.c
++++ b/drivers/md/dm-mpath.c
+@@ -1520,6 +1520,12 @@ static int multipath_ioctl(struct dm_target *ti, unsigned int cmd,
+
+ spin_unlock_irqrestore(&m->lock, flags);
+
++ /*
++ * Only pass ioctls through if the device sizes match exactly.
++ */
++ if (!r && ti->len != i_size_read(bdev->bd_inode) >> SECTOR_SHIFT)
++ r = scsi_verify_blk_ioctl(NULL, cmd);
++
+ return r ? : __blkdev_driver_ioctl(bdev, mode, cmd, arg);
+ }
+
+--
+1.7.7.5
+
diff --git a/kernel.spec b/kernel.spec
index 2fdc0c1..617fb18 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -42,7 +42,7 @@ Summary: The Linux kernel
# When changing real_sublevel below, reset this by hand to 1
# (or to 0 and then use rpmdev-bumpspec).
#
-%global baserelease 3
+%global baserelease 4
%global fedora_build %{baserelease}
# real_sublevel is the 3.x kernel version we're starting with
@@ -744,6 +744,11 @@ Patch21075: KVM-x86-fix-missing-checks-in-syscall-emulation.patch
#rhbz 728740
Patch21076: rtl8192cu-Fix-WARNING-on-suspend-resume.patch
+Patch21077: 01-block-add-and-use-scsi_blk_cmd_ioctl.patch
+Patch21078: 02-block-fail-SCSI-passthrough-ioctls-on-partition-devs.patch
+Patch21079: 03-dm-dont-fwd-ioctls-from-LVs-to-underlying-dev.patch
+
+
%endif
BuildRoot: %{_tmppath}/kernel-%{KVERREL}-root
@@ -1381,6 +1386,11 @@ ApplyPatch KVM-x86-fix-missing-checks-in-syscall-emulation.patch
#rhbz 728740
ApplyPatch rtl8192cu-Fix-WARNING-on-suspend-resume.patch
+#rhbz 769911
+ApplyPatch 01-block-add-and-use-scsi_blk_cmd_ioctl.patch
+ApplyPatch 02-block-fail-SCSI-passthrough-ioctls-on-partition-devs.patch
+ApplyPatch 03-dm-dont-fwd-ioctls-from-LVs-to-underlying-dev.patch
+
# END OF PATCH APPLICATIONS
%endif
@@ -2028,6 +2038,9 @@ fi
# and build.
%changelog
+* Tue Jan 17 2012 Josh Boyer <jwboyer at redhat.com>
+- CVE-2011-4127 possible privilege escalation via SG_IO ioctl (rhbz 769911)
+
* Sun Jan 15 2012 Josh Boyer <jwboyer at redhat.com>
- Avoid packaging symlinks for kernel-doc files (rhbz 767351)
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