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Message-ID: <4AAEEA65.4010507@kernel.sg> Date: Tue, 15 Sep 2009 09:14:13 +0800 From: Eugene Teo <eugeneteo@...nel.sg> To: oss-security@...ts.openwall.com CC: "Steven M. Christey" <coley@...us.mitre.org> Subject: CVE-2009-1883 kernel: missing capability check in z90crypt There is a missing capability check in the z90crypt driver in the Linux kernel. This missing check could allow a local, unprivileged user to bypass intended capability restrictions. Thanks to Solar Designer for reporting this issue to us. Note that this does not affect upstream anymore. @@ -1887,20 +1887,21 @@ z90crypt_unlocked_ioctl(struct file *fil PRINTK("No longer issuing messages about depre" "cated ioctl Z90STAT_PCIXCCCOUNT.\n"); } tempstat = get_status_PCIXCCcount(); if (copy_to_user((int *)arg, &tempstat, sizeof(int)) != 0) ret = -EFAULT; break; case Z90QUIESCE: if (current->euid != 0) { <-- should check a capability PRINTK("QUIESCE fails: euid %d\n", current->euid); ret = -EACCES; } else { PRINTK("QUIESCE device from PID %d\n", PID()); quiesce_z90crypt = 1; } break; Thanks, Eugene
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