path: root/init/main.c
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authorRichard Weinberger <richard@nod.at>2011-03-23 16:43:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-23 19:46:54 -0700
commitbfdc0b497faa82a0ba2f9dddcf109231dd519fcc (patch)
tree932897262447dacb7158b81209748a295d93e20b /init/main.c
parentsysctl: add some missing input constraint checks (diff)
sysctl: restrict write access to dmesg_restrict
When dmesg_restrict is set to 1 CAP_SYS_ADMIN is needed to read the kernel ring buffer. But a root user without CAP_SYS_ADMIN is able to reset dmesg_restrict to 0. This is an issue when e.g. LXC (Linux Containers) are used and complete user space is running without CAP_SYS_ADMIN. A unprivileged and jailed root user can bypass the dmesg_restrict protection. With this patch writing to dmesg_restrict is only allowed when root has CAP_SYS_ADMIN. Signed-off-by: Richard Weinberger <richard@nod.at> Acked-by: Dan Rosenberg <drosenberg@vsecurity.com> Acked-by: Serge E. Hallyn <serge@hallyn.com> Cc: Eric Paris <eparis@redhat.com> Cc: Kees Cook <kees.cook@canonical.com> Cc: James Morris <jmorris@namei.org> Cc: Eugene Teo <eugeneteo@kernel.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init/main.c')
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