twx-linux

Files

T

Andy Lutomirski 5a5f703019 x86/traps: Ignore high word of regs->cs in early_fixup_exception()

commit fc0e81b2be upstream.

On the 80486 DX, it seems that some exceptions may leave garbage in
the high bits of CS.  This causes sporadic failures in which
early_fixup_exception() refuses to fix up an exception.

As far as I can tell, this has been buggy for a long time, but the
problem seems to have been exacerbated by commits:

  1e02ce4ccc ("x86: Store a per-cpu shadow copy of CR4")
  e1bfc11c5a ("x86/init: Fix cr4_init_shadow() on CR4-less machines")

This appears to have broken for as long as we've had early
exception handling.

[ This backport should apply to kernels from 3.4 - 4.5. ]

Fixes: 4c5023a3fa ("x86-32: Handle exception table entries during early boot")
Cc: H. Peter Anvin <hpa@zytor.com>
Reported-by: Matthew Whitehead <tedheadster@gmail.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2016-12-08 07:15:24 +01:00

boot

x86/build: Build compressed x86 kernels as PIE

2016-10-20 10:00:47 +02:00

configs

kconfig: tinyconfig: provide whole choice blocks to avoid warnings

2016-09-24 10:07:42 +02:00

crypto

crypto: sha1-mb - use corrcet pointer while completing jobs

2016-05-04 14:48:44 -07:00

entry

x86/syscalls/64: Add compat_sys_keyctl for 32-bit userspace