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authorEric Paris <eparis@redhat.com>2007-11-27 02:47:46 +0300
committerJames Morris <jmorris@namei.org>2007-12-05 16:24:30 +0300
commitab5a91a8364c3d6fc617abc47cc81d162c01d90a (patch)
tree0b7f4ef877f56be57f75b8b455b9f694f19da633 /mm/mmap.c
parentd313f948309ab22797316e789a7ff8fa358176b6 (diff)
downloadlinux-ab5a91a8364c3d6fc617abc47cc81d162c01d90a.tar.xz
Security: allow capable check to permit mmap or low vm space
On a kernel with CONFIG_SECURITY but without an LSM which implements security_file_mmap it is impossible for an application to mmap addresses lower than mmap_min_addr. Based on a suggestion from a developer in the openwall community this patch adds a check for CAP_SYS_RAWIO. It is assumed that any process with this capability can harm the system a lot more easily than writing some stuff on the zero page and then trying to get the kernel to trip over itself. It also means that programs like X on i686 which use vm86 emulation can work even with mmap_min_addr set. Signed-off-by: Eric Paris <eparis@redhat.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'mm/mmap.c')
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