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 <[email protected]> Signed-off-by: WANG Cong <[email protected]> --- 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; /* _______________________________________________ kexec mailing list [email protected] http://lists.infradead.org/mailman/listinfo/kexec
