From: Amerigo Wang <amwang@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: WANG Cong <amwang@redhat.com>,
Eric Biederman <ebiederm@xmission.com>,
kexec@lists.infradead.org
Subject: [Patch] kexec_load: check CAP_SYS_MODULE
Date: Thu, 6 Jan 2011 16:25:25 +0800 [thread overview]
Message-ID: <1294302325-22593-1-git-send-email-amwang@redhat.com> (raw)
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;
/*
WARNING: multiple messages have this Message-ID (diff)
From: Amerigo Wang <amwang@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: kexec@lists.infradead.org, WANG Cong <amwang@redhat.com>,
Eric Biederman <ebiederm@xmission.com>
Subject: [Patch] kexec_load: check CAP_SYS_MODULE
Date: Thu, 6 Jan 2011 16:25:25 +0800 [thread overview]
Message-ID: <1294302325-22593-1-git-send-email-amwang@redhat.com> (raw)
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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next reply other threads:[~2011-01-06 8:25 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-06 8:25 Amerigo Wang [this message]
2011-01-06 8:25 ` [Patch] kexec_load: check CAP_SYS_MODULE Amerigo Wang
2011-01-06 8:27 ` Cong Wang
2011-01-06 8:27 ` Cong Wang
2011-01-06 8:47 ` Eric W. Biederman
2011-01-06 8:47 ` Eric W. Biederman
2011-01-06 19:02 ` Eric Paris
2011-01-06 19:02 ` Eric Paris
2011-01-07 20:10 ` Eric W. Biederman
2011-01-07 20:10 ` Eric W. Biederman
2011-01-07 20:32 ` Eric Paris
2011-01-07 20:32 ` Eric Paris
2011-01-07 21:02 ` Eric W. Biederman
2011-01-07 21:02 ` Eric W. Biederman
2011-01-08 0:39 ` Eric Paris
2011-01-08 0:39 ` Eric Paris
2011-01-09 2:09 ` Eric W. Biederman
2011-01-09 2:09 ` Eric W. Biederman
2011-01-11 11:26 ` Cong Wang
2011-01-11 11:26 ` Cong Wang
2011-01-14 19:47 ` Eric Paris
2011-01-14 19:47 ` Eric Paris
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