From: Alan Cox Date: Wed, 7 Nov 2007 23:58:10 +0000 (+0000) Subject: [SCSI] aacraid: fix security weakness X-Git-Tag: v2.6.25-rc1~1230^2~39 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d496f94d22d1491ffb25f4000e85f7a4ecf7f2c4;p=linux-2.6 [SCSI] aacraid: fix security weakness Actually there are several but one is trivially fixed 1. FSACTL_GET_NEXT_ADAPTER_FIB ioctl does not lock dev->fib_list but needs to 2. Ditto for FSACTL_CLOSE_GET_ADAPTER_FIB 3. It is possible to construct an attack via the SRB ioctls where the user obtains assorted elevated privileges. Various approaches are possible, the trivial ones being things like writing to the raw media via scsi commands and the swap image of other executing programs with higher privileges. So the ioctls should be CAP_SYS_RAWIO - at least all the FIB manipulating ones. This is a bandaid fix for #3 but probably the ioctls should grow their own capable checks. The other two bugs need someone competent in that driver to fix them. Signed-off-by: Alan Cox Signed-off-by: Mark Salyzyn Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c index 0523cc6d89..143e4c16b0 100644 --- a/drivers/scsi/aacraid/linit.c +++ b/drivers/scsi/aacraid/linit.c @@ -517,6 +517,8 @@ static struct device_attribute *aac_dev_attrs[] = { static int aac_ioctl(struct scsi_device *sdev, int cmd, void __user * arg) { struct aac_dev *dev = (struct aac_dev *)sdev->host->hostdata; + if (!capable(CAP_SYS_RAWIO)) + return -EPERM; return aac_do_ioctl(dev, cmd, arg); }