Fedora: 2004-111 Critical: Kernel Memory Leak and DoS Fixes

The kernel package contains the Linux kernel (vmlinuz), the core of your

Fedora Core Linux operating system. The kernel handles the basic functions

of the operating system: memory allocation, process allocation, device

input and output, etc.

A memory leak was fixed in an error path in the do_fork() routine.

This was unlikely to have caused problems in real world situations.

The information leak fixed in the previous errata was also found

to affect XFS and JFS. The Common Vulnerabilities and

Exposures project (cve.mitre.org) assigned the names

CAN-2004-0133 and CAN-2004-0181 respectively.

A vulnerability in the OSS code for SoundBlaster 16 devices

was discovered by Andreas Kies. It is possible for local users with

access to the sound system to crash the machine (CAN-2004-0178).

An automated checked from Synopsys Software Security | Software Integrity Group highlighted a

range checking bug in the i810 DRM driver. This was fixed by

Andrea Arcangeli and Chris Wright.

Arjan van de Ven discovered the framebuffer code was doing direct

userspace accesses instead of using correct interfaces to write

to userspace.

Brad Spengler found a signedness issue in the cpufreq proc handler

which could lead to users being able to read arbitary regions of

kernel memory. This was fixed by Dominik Brodowski.

Shaun Colley found a potential buffer overrun in the panic() function.

As this function does not ever return, it is unlikely that this is

exploitable, but has been fixed nonetheless. The Common Vulnerabilities

and Exposures project (cve.mitre.org) assigned the name CAN-2004-0394

to this issue.

Paul Starzetz and Wojciech Purczynski found a lack of bounds

checking in the MCAST_MSFILTER socket option which allows user code

to write into kernel space, potentially giving the attacker full

root priveledges. There has already been proof of concept code published

exploiting this hole in a local denial-of-service manner.

isec has more

information. The Common Vulnerabilities and Exposures project (cve.mitre.org)

assigned the name CAN-2004-0424 to this issue.

The previous security errata actually missed fixes for several important

problems. This has been corrected in this update.

* Wed Apr 21 2004 Dave Jones <davej@redhat.com>

- Fix memory leak in do_fork() error path

- Really fix CAN-2004-0109 and previous mremap issue.

These patches were not applied in the previous errata.

- Fix information leak in XFS (CAN-2004-0133)

- Fix potential local denial of service in sb16 driver (CAN-2004-0178)

- Fix information leak in JFS (CAN-2004-0181)

- Add range checking to i810_dma() in DRM driver.

- Make ioctl(FBIOGETCMAP) use copy_to_user() rather than memcpy()

- Fix information leak in cpufreq userspace ioctl. (CAN-2004-0228)

- Fix possible buffer overflow in panic() (CAN-2004-0394)

- Fix setsockopt MCAST_MSFILTER integer overflow. (CAN-2004-0424)

This update can be downloaded from:

75f1d486b4bc23fd6c34d1ac33920724 SRPMS/kernel-2.4.22-1.2188.nptl.src.rpm

239e59f63da4e9bf0e297c4b0ffac7ce i386/kernel-source-2.4.22-1.2188.nptl.i386.rpm

50fde8004e1e3a84ced9a2f6c66ffd07 i386/kernel-doc-2.4.22-1.2188.nptl.i386.rpm

d8e68e04d5f7d3755df996c41e8df9c2 i386/kernel-BOOT-2.4.22-1.2188.nptl.i386.rpm

a204e6e53423969c02864b09086e73f5 i386/debug/kernel-debuginfo-2.4.22-1.2188.nptl.i386.rpm

2b518491380f771f501fa7cfdcbd42fb i386/kernel-2.4.22-1.2188.nptl.i586.rpm

c65b2970c92097801c47e255f9779934 i386/debug/kernel-debuginfo-2.4.22-1.2188.nptl.i586.rpm

afdb43dd8d43fefaadfa67d9b732dfbb i386/kernel-2.4.22-1.2188.nptl.i686.rpm

c7478f1d67afc3fc9fcbed0ec48c6ab4 i386/kernel-smp-2.4.22-1.2188.nptl.i686.rpm

6f4d55c5c33cd5acfb2b154b487db1a1 i386/debug/kernel-debuginfo-2.4.22-1.2188.nptl.i686.rpm

6521958fababb5119d4c8ae86a2cfdae i386/kernel-2.4.22-1.2188.nptl.athlon.rpm

a2564f12667c6c67f9a0f303e4e4f47d i386/kernel-smp-2.4.22-1.2188.nptl.athlon.rpm

c1aaebee0fc58ca76384d738d74d5593 i386/debug/kernel-debuginfo-2.4.22-1.2188.nptl.athlon.rpm

d9f8b22611c5a2d26f8724a286e13279 x86_64/kernel-2.4.22-1.2188.nptl.x86_64.rpm

544f91c1fd6b83bef0c81ed9405bfedc x86_64/kernel-source-2.4.22-1.2188.nptl.x86_64.rpm

5b00ae1a0c17668649b0bbca82529e28 x86_64/kernel-doc-2.4.22-1.2188.nptl.x86_64.rpm

143b5e5f807fb900028bc8605d9003b0 x86_64/kernel-smp-2.4.22-1.2188.nptl.x86_64.rpm

e67ea040f87d8b3a5b3efd541c2161a7 x86_64/debug/kernel-debuginfo-2.4.22-1.2188.nptl.x86_64.rpm

This update can also be installed with the Update Agent; you can

launch the Update Agent with the 'up2date' command.

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