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TITLE:
Linux Kernel Ext4 RLIMIT_FSIZE Security Bypass

SECUNIA ADVISORY ID:
SA39982

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/39982/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=39982

RELEASE DATE:
2010-05-31

DISCUSS ADVISORY:
http://secunia.com/advisories/39982/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
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 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/39982/

ONLY AVAILABLE IN CUSTOMER AREA:
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https://ca.secunia.com/?page=viewadvisory&vuln_id=39982

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
A security issue has been reported in the Linux Kernel, which can be
exploited by malicious, local users to bypass certain security
restrictions.

The security issue is caused due to the "ext4_fallocate()" function
in fs/ext4/extents.c not properly verifying if the file size is
greater than the "RLIMIT_FSIZE" value, which can be exploited to
create bigger files than allowed via e.g. the "posix_fallocate()"
function.

SOLUTION:
Fixed in version 2.6.35-rc1.

PROVIDED AND/OR DISCOVERED BY:
Disclosed in a GIT commit.

ORIGINAL ADVISORY:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=6d19c42b7cf81c39632b6d4dbc514e8449bcd346

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/products/corporate/EVM/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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