Messages in this thread Patch in this message | | | From | Amerigo Wang <> | Subject | [Patch] kexec_load: check CAP_SYS_MODULE | Date | Thu, 6 Jan 2011 16:25:25 +0800 |
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Eric pointed out that kexec_load() actually allows you to run any code you want in ring0, this is more like CAP_SYS_MODULE.
Reported-by: Eric Paris <eparis@redhat.com> Signed-off-by: WANG Cong <amwang@redhat.com>
--- diff --git a/kernel/kexec.c b/kernel/kexec.c index b55045b..c30d613 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -945,7 +945,7 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, int result; /* We only trust the superuser with rebooting the system. */ - if (!capable(CAP_SYS_BOOT)) + if (!capable(CAP_SYS_BOOT) || !capable(CAP_SYS_MODULE)) return -EPERM; /*
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