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sg_write()/bsg_write() is not fit to be called under KERNEL_DS
authorAl Viro <viro@zeniv.linux.org.uk>
Fri, 16 Dec 2016 18:42:06 +0000 (13:42 -0500)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 9 Jan 2017 07:22:03 +0000 (08:22 +0100)
commit48f26edb689c83af15b6afe657e96424ca9d13d9
tree80585845f335022acbe9977234f5ec92acab7435tree
parentd787c6b32c3f7b15e7ecf41c636edb167797d939commit | diff
sg_write()/bsg_write() is not fit to be called under KERNEL_DS

commit 128394eff343fc6d2f32172f03e24829539c5835 upstream.

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.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
block/bsg.c diff | blob | blame | history
drivers/scsi/sg.c diff | blob | blame | history
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git