CVE-2011-1593

Bug Description

next_pidmap: fix overflow condition

next_pidmap() just quietly accepted whatever 'last' pid that was passed
in, which is not all that safe when one of the users is /proc.

Admittedly the proc code should do some sanity checking on the range
(and that will be the next commit), but that doesn't mean that the
helper functions should just do that pidmap pointer arithmetic without
checking the range of its arguments.

So clamp 'last' to PID_MAX_LIMIT. The fact that we then do "last+1"
doesn't really matter, the for-loop does check against the end of the
pidmap array properly (it's only the actual pointer arithmetic overflow
case we need to worry about, and going one bit beyond isn't going to
overflow).

---

proc: do proper range check on readdir offset

Rather than pass in some random truncated offset to the pid-related
functions, check that the offset is in range up-front.

Fix released on 2.6.39-rc4

Fix released with stable update (2.6.32.39)

Fix released with stable update (2.6.35.13)

Fix released with stable update (2.6.38.4)

fix already present

This bug was fixed in the package linux - 2.6.24-29.90

---------------
linux (2.6.24-29.90) hardy-proposed; urgency=low

[ Herton R. Krzesinski ]

* Release Tracking Bug
- LP: #788843

[Upstream Kernel Changes]

* IB/cm: Bump reference count on cm_id before invoking callback,
CVE-2011-0695
- LP: #770369
- CVE-2011-0695
* RDMA/cma: Fix crash in request handlers, CVE-2011-0695
- LP: #770369
- CVE-2011-0695
* ALSA: caiaq - Fix possible string-buffer overflow, CVE-2011-0712
- LP: #768448
- CVE-2011-0712
* Treat writes as new when holes span across page boundaries,
CVE-2011-0463
- LP: #770483
- CVE-2011-0463
* net: clear heap allocations for privileged ethtool actions,
CVE-2010-4655
- LP: #771445
- CVE-2010-4655
* usb: iowarrior: don't trust report_size for buffer size, CVE-2010-4656
- LP: #711484
- CVE-2010-4656
* fs/partitions/ldm.c: fix oops caused by corrupted partition table,
CVE-2011-1017
- LP: #771382
- CVE-2011-1017
* ldm: corrupted partition table can cause kernel oops, CVE-2011-1017
- LP: #771382
- CVE-2011-1017
* next_pidmap: fix overflow condition, CVE-2011-1593
- LP: #784727
- CVE-2011-1593
* proc: do proper range check on readdir offset, CVE-2011-1593
- LP: #784727
- CVE-2011-1593
-- Herton Ronaldo Krzesinski <email address hidden> 2011年5月26日 18:15:42 -0300

This bug was fixed in the package linux-fsl-imx51 - 2.6.31-609.26

---------------
linux-fsl-imx51 (2.6.31-609.26) lucid; urgency=low

[ Paolo Pisati ]

* Tracking bug
- LP: #795219
* [Config] Disable parport_pc on fsl-imx51
- LP: #601226

[ Upstream Kernel Changes ]

* ALSA: sound/pci/rme9652: prevent reading uninitialized stack memory
- LP: #712723, #712737
* can-bcm: fix minor heap overflow
- LP: #710680
* drivers/video/via/ioctl.c: prevent reading uninitialized stack memory
- LP: #712744
* gdth: integer overflow in ioctl
- LP: #711797
* inet_diag: Make sure we actually run the same bytecode we audited, CVE-2010-3880
- LP: #711865
- CVE-2010-3880
* net: fix rds_iovec page count overflow, CVE-2010-3865
- LP: #709153
- CVE-2010-3865
* net: packet: fix information leak to userland, CVE-2010-3876
- LP: #711045
- CVE-2010-3876
* net: tipc: fix information leak to userland, CVE-2010-3877
- LP: #711291
- CVE-2010-3877
* net: Truncate recvfrom and sendto length to INT_MAX.
- LP: #708839
* posix-cpu-timers: workaround to suppress the problems with mt exec
- LP: #712609
* sys_semctl: fix kernel stack leakage
- LP: #712749
* x25: Patch to fix bug 15678 - x25 accesses fields beyond end of packet.
- LP: #709372
* memory corruption in X.25 facilities parsing
- LP: #709372
* net: ax25: fix information leak to userland, CVE-2010-3875
- LP: #710714
- CVE-2010-3875
* net: ax25: fix information leak to userland harder, CVE-2010-3875
- LP: #710714
- CVE-2010-3875
* fs/partitions/ldm.c: fix oops caused by corrupted partition table, CVE-2011-1017
- LP: #771382
- CVE-2011-1017
* net: clear heap allocations for privileged ethtool actions
- LP: #771445
* Prevent rt_sigqueueinfo and rt_tgsigqueueinfo from spoofing the signal code
- LP: #772543
* Relax si_code check in rt_sigqueueinfo and rt_tgsigqueueinfo
- LP: #772543
* exec: make argv/envp memory visible to oom-killer
- LP: #768408
* next_pidmap: fix overflow condition
- LP: #784727
* proc: do proper range check on readdir offset
- LP: #784727
* mpt2sas: prevent heap overflows and unchecked reads
- LP: #787145
* agp: fix arbitrary kernel memory writes
- LP: #788684
* can: add missing socket check in can/raw release
- LP: #788694
* agp: fix OOM and buffer overflow
- LP: #788700
* do_exit(): make sure that we run with get_fs() == USER_DS - CVE-2010-4258
- LP: #723945
- CVE-2010-4258
* x25: Prevent crashing when parsing bad X.25 facilities - CVE-2010-4164
- LP: #731199
- CVE-2010-4164
* install_special_mapping skips security_file_mmap check - CVE-2010-4346
- LP: #731971
- CVE-2010-4346
* econet: Fix crash in aun_incoming() - CVE-2010-4342
- LP: #736394
- CVE-2010-4342
* sound: Prevent buffer overflow in OSS load_mixer_volumes - CVE-2010-4527
- LP: #737073
- CVE-2010-4527
* irda: prevent integer underflow in IRLMP_ENUMDEVICES, CVE-2010-4529
- LP: #737823
- CVE-2010-4529
* CAN: Use inode instead of kernel address for /proc file - CVE-2010-4565
- LP: #765007...

Thank you for reporting this bug to Ubuntu. maverick has reached EOL
(End of Life) for this package and is no longer supported. As
a result, this bug against maverick is being marked "Won't Fix".
Please see https://wiki.ubuntu.com/Releases for currently
supported Ubuntu releases.

Please feel free to report any other bugs you may find.

lucid has seen the end of its life and is no longer receiving any updates. Marking the lucid task for this ticket as "Won't Fix".