linux-kernel - [Patch] kexec_load: check CAP_SYS

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Message-Id: <1294302325-22593-1-git-send-email-amwang@redhat.com>
Date:	Thu,  6 Jan 2011 16:25:25 +0800
From:	Amerigo Wang <amwang@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	WANG Cong <amwang@...hat.com>,
	Eric Biederman <ebiederm@...ssion.com>,
	kexec@...ts.infradead.org
Subject: [Patch] kexec_load: check CAP_SYS_MODULE

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@...hat.com>
Signed-off-by: WANG Cong <amwang@...hat.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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