diff options
| author | H. Peter Anvin <hpa@linux.intel.com> | 2014-03-16 15:31:54 -0700 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2014-05-15 09:55:02 +0200 |
| commit | 21ab0ac5ef79656fabf9cd36b1312e49fa6bf1ab (patch) | |
| tree | 5b8b14ec00a5bf1f2c312be62602d760e2fa2419 /drivers | |
| parent | 7d983dca8a416017d7df075c123af9168fbb503c (diff) | |
x86-64, modify_ldt: Ban 16-bit segments on 64-bit kernels
commit b3b42ac2cbae1f3cecbb6229964a4d48af31d382 upstream.
The IRET instruction, when returning to a 16-bit segment, only
restores the bottom 16 bits of the user space stack pointer. We have
a software workaround for that ("espfix") for the 32-bit kernel, but
it relies on a nonzero stack segment base which is not available in
32-bit mode.
Since 16-bit support is somewhat crippled anyway on a 64-bit kernel
(no V86 mode), and most (if not quite all) 64-bit processors support
virtualization for the users who really need it, simply reject
attempts at creating a 16-bit segment when running on top of a 64-bit
kernel.
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/n/tip-kicdm89kzw9lldryb1br9od0@git.kernel.org
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions