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Vigil@nce: Linux kernel, memory disclosure via xfs_ioc_fsgetxattr

September 2010 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/

SYNTHESIS OF THE VULNERABILITY

An attacker can use the XFS_IOC_FSGETXATTR IOCTL of the XFS driver
in order to read kernel data.

 Severity: 1/4
 Creation date: 07/09/2010

DESCRIPTION OF THE VULNERABILITY

The xfs_ioc_fsgetxattr() function of the file
fs/xfs/linux-2.6/xfs_ioctl.c handles the XFS_IOC_FSGETXATTR IOCTL
used to obtain extended attributes of a file on an XFS filesystem.

The copy_to_user() function copies a kernel memory bloc to a user
memory bloc.

The xfs_ioc_fsgetxattr() function uses a local structure
initialized with various information. This structure is then
copied to a caller provided buffer via the copy_to_user()
function. However, not all fields of the local structure are
initialized. Some bytes are therefore leaked to the caller.

An attacker can therefore use the XFS_IOC_FSGETXATTR IOCTL of the
XFS driver in order to read kernel data.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-memory-disclosure-via-xfs-ioc-fsgetxattr-9902


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