From: Al Viro Date: Fri, 16 Dec 2016 18:42:06 +0000 (-0500) Subject: sg_write()/bsg_write() is not fit to be called under KERNEL_DS X-Git-Tag: v4.14-rc1~1788^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=128394eff343fc6d2f32172f03e24829539c5835;p=platform%2Fkernel%2Flinux-rpi3.git sg_write()/bsg_write() is not fit to be called under KERNEL_DS Both damn things interpret userland pointers embedded into the payload; worse, they are actually traversing those. Leaving aside the bad API design, this is very much _not_ safe to call with KERNEL_DS. Bail out early if that happens. Cc: stable@vger.kernel.org Signed-off-by: Al Viro --- diff --git a/block/bsg.c b/block/bsg.c index 8a05a40..a57046d 100644 --- a/block/bsg.c +++ b/block/bsg.c @@ -655,6 +655,9 @@ bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) dprintk("%s: write %Zd bytes\n", bd->name, count); + if (unlikely(segment_eq(get_fs(), KERNEL_DS))) + return -EINVAL; + bsg_set_block(bd, file); bytes_written = 0; diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index 070332e..dbe5b4b 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -581,6 +581,9 @@ sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) sg_io_hdr_t *hp; unsigned char cmnd[SG_MAX_CDB_SIZE]; + if (unlikely(segment_eq(get_fs(), KERNEL_DS))) + return -EINVAL; + if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) return -ENXIO; SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp,