lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Tue, 12 Jan 2021 17:29:42 +0800
From:   Kunkun Jiang <jiangkunkun@...wei.com>
To:     Paolo Bonzini <pbonzini@...hat.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <wanghaibin.wang@...wei.com>, Keqian Zhu <zhukeqian1@...wei.com>
Subject: [PATCH] kvm: Fixes lack of KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2 enabled check

The KVM_CLEAR_DIRTY_LOG ioctl lacks the check whether the capability
KVM_CAP_MANUAL_DIRTY_LOG_PROTECT is enabled or not. This may cause
some problems if userspace calls the KVM_CLEAR_DIRTY_LOG ioctl, but
dose't enable this capability. So we'd better to add it.

Fixes: 2a31b9db15353 ("kvm: introduce manual dirty log reprotect")
Signed-off-by: Kunkun Jiang <jiangkunkun@...wei.com>
---
 virt/kvm/kvm_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index fa9e3614d30e..8f5633d8a0e8 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1602,6 +1602,9 @@ static int kvm_clear_dirty_log_protect(struct kvm *kvm,
 	unsigned long *dirty_bitmap_buffer;
 	bool flush;
 
+	if (!kvm->manual_dirty_log_protect)
+		return -EPERM;
+
 	/* Dirty ring tracking is exclusive to dirty log tracking */
 	if (kvm->dirty_ring_size)
 		return -ENXIO;
-- 
2.19.1

Powered by blists - more mailing lists