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Old 05-04-2010, 05:02 PM
Tim Gardner
Default LP#568844 -- allow reading of /proc/mmap_min_addr

On 05/04/2010 05:45 PM, Andy Whitcroft wrote:
> A number of applications need to be able read mmap_min_addr in order to
> determine where they should map segments. The permissions on the proc file
> imply that read should be possible but read is prevented by capabilities.
> As it is possible for an attacker to determine the current setting by
> repeated attempts to map low pages pages there is no point protecting this
> information.
> The following patch has been submitted upstream and in the security-testing
> tree. Proposing this for Maverick and SRU to Lucid.
> -apw
> Kees Cook (1):
> UBUNTU: SAUCE: mmap_min_addr check CAP_SYS_RAWIO only for write
> security/min_addr.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)

Acked-by: Tim Gardner <tim.gardner@canonical.com>

Tim Gardner tim.gardner@canonical.com

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