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  1. 10 2月, 2009 5 次提交
    • T
      x86: use asm .macro instead of cpp #define in entry_32.S · f0d96110
      由 Tejun Heo 提交于 
      Impact: cleanup

Use .macro instead of cpp #define where approriate.  This cleans up
code and will ease future changes.
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      f0d96110
    • T
      x86: no stack protector for vdso · d627ded5
      由 Tejun Heo 提交于 
      Impact: avoid crash on vsyscall
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      d627ded5
    • T
      stackprotector: update make rules · 5d707e9c
      由 Tejun Heo 提交于 
      Impact: no default -fno-stack-protector if stackp is enabled, cleanup

Stackprotector make rules had the following problems.

* cc support test and warning are scattered across makefile and
  kernel/panic.c.

* -fno-stack-protector was always added regardless of configuration.

Update such that cc support test and warning are contained in makefile
and -fno-stack-protector is added iff stackp is turned off.  While at
it, prepare for 32bit support.
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      5d707e9c
    • T
      x86: stackprotector.h misc update · 76397f72
      由 Tejun Heo 提交于 
      Impact: misc udpate

* wrap content with CONFIG_CC_STACK_PROTECTOR so that other arch files
  can include it directly

* add missing includes

This will help future changes.
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      76397f72
    • T
      x86: fix math_emu register frame access · d315760f
      由 Tejun Heo 提交于 
      do_device_not_available() is the handler for #NM and it declares that
it takes a unsigned long and calls math_emu(), which takes a long
argument and surprisingly expects the stack frame starting at the zero
argument would match struct math_emu_info, which isn't true regardless
of configuration in the current code.

This patch makes do_device_not_available() take struct pt_regs like
other exception handlers and initialize struct math_emu_info with
pointer to it and pass pointer to the math_emu_info to math_emulate()
like normal C functions do.  This way, unless gcc makes a copy of
struct pt_regs in do_device_not_available(), the register frame is
correctly accessed regardless of kernel configuration or compiler
used.

This doesn't fix all math_emu problems but it at least gets it
somewhat working.
Signed-off-by: NTejun Heo <tj@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
      d315760f
  3. 09 2月, 2009 8 次提交
  5. 07 2月, 2009 1 次提交
    • R
      x86-64: fix int $0x80 -ENOSYS return · c09249f8
      由 Roland McGrath 提交于 
      One of my past fixes to this code introduced a different new bug.
When using 32-bit "int $0x80" entry for a bogus syscall number,
the return value is not correctly set to -ENOSYS.  This only happens
when neither syscall-audit nor syscall tracing is enabled (i.e., never
seen if auditd ever started).  Test program:

	/* gcc -o int80-badsys -m32 -g int80-badsys.c
	   Run on x86-64 kernel.
	   Note to reproduce the bug you need auditd never to have started.  */

	#include <errno.h>
	#include <stdio.h>

	int
	main (void)
	{
	  long res;
	  asm ("int $0x80" : "=a" (res) : "0" (99999));
	  printf ("bad syscall returns %ld\n", res);
	  return res != -ENOSYS;
	}

The fix makes the int $0x80 path match the sysenter and syscall paths.
Reported-by: NDmitry V. Levin <ldv@altlinux.org>
Signed-off-by: NRoland McGrath <roland@redhat.com>
      c09249f8
  7. 06 2月, 2009 3 次提交
  9. 05 2月, 2009 11 次提交
  11. 04 2月, 2009 12 次提交