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 at redhat.com> Signed-off-by: WANG Cong <amwang at 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; /*
