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  1. 23 6月, 2006 4 次提交
  3. 22 6月, 2006 2 次提交
  5. 20 6月, 2006 2 次提交
  7. 06 6月, 2006 2 次提交
  9. 05 6月, 2006 3 次提交
  11. 01 6月, 2006 2 次提交
  13. 31 5月, 2006 7 次提交
  15. 26 4月, 2006 1 次提交
  17. 20 4月, 2006 1 次提交
    • A
      [PATCH] i386/x86-64: Fix x87 information leak between processes · 18bd057b
      由 Andi Kleen 提交于 
      AMD K7/K8 CPUs only save/restore the FOP/FIP/FDP x87 registers in FXSAVE
when an exception is pending.  This means the value leak through
context switches and allow processes to observe some x87 instruction
state of other processes.

This was actually documented by AMD, but nobody recognized it as
being different from Intel before.

The fix first adds an optimization: instead of unconditionally
calling FNCLEX after each FXSAVE test if ES is pending and skip
it when not needed. Then do a x87 load from a kernel variable to
clear FOP/FIP/FDP.

This means other processes always will only see a constant value
defined by the kernel in their FP state.

I took some pain to make sure to chose a variable that's already
in L1 during context switch to make the overhead of this low.

Also alternative() is used to patch away the new code on CPUs
who don't need it.

Patch for both i386/x86-64.

The problem was discovered originally by Jan Beulich. Richard
Brunner provided the basic code for the workarounds, with contribution
from Jan.

This is CVE-2006-1056

Cc: richard.brunner@amd.com
Cc: jbeulich@novell.com
Signed-off-by: NAndi Kleen <ak@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      18bd057b
  19. 19 4月, 2006 2 次提交
  21. 11 4月, 2006 3 次提交
  23. 10 4月, 2006 2 次提交
  25. 01 4月, 2006 1 次提交
    • O
      [PATCH] Don't pass boot parameters to argv_init[] · 9b41046c
      由 OGAWA Hirofumi 提交于 
      The boot cmdline is parsed in parse_early_param() and
parse_args(,unknown_bootoption).

And __setup() is used in obsolete_checksetup().

	start_kernel()
		-> parse_args()
			-> unknown_bootoption()
				-> obsolete_checksetup()

If __setup()'s callback (->setup_func()) returns 1 in
obsolete_checksetup(), obsolete_checksetup() thinks a parameter was
handled.

If ->setup_func() returns 0, obsolete_checksetup() tries other
->setup_func().  If all ->setup_func() that matched a parameter returns 0,
a parameter is seted to argv_init[].

Then, when runing /sbin/init or init=app, argv_init[] is passed to the app.
If the app doesn't ignore those arguments, it will warning and exit.

This patch fixes a wrong usage of it, however fixes obvious one only.
Signed-off-by: NOGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      9b41046c
  27. 28 3月, 2006 4 次提交
  29. 27 3月, 2006 1 次提交
  31. 26 3月, 2006 3 次提交