Messages in this thread Patch in this message | | | From | Andy Lutomirski <> | Subject | [PATCH] x86/entry/compat: Add missing CLAC to entry_INT80_32 | Date | Wed, 24 Feb 2016 12:18:49 -0800 |
| |
This doesn't seem to fix a regression -- I don't think the CLAC was ever there.
I double-checked in a debugger: entries through the int80 gate do not automatically clear AC.
Stable maintainers: I can provide a backport to 4.3 and earlier if needed. This needs to be backported all the way to 3.10.
Reported-by: Brian Gerst <brgerst@gmail.com> Cc: stable@vger.kernel.org Fixes: 63bcff2a307b ("x86, smap: Add STAC and CLAC instructions to control user space access") Signed-off-by: Andy Lutomirski <luto@kernel.org> --- arch/x86/entry/entry_64_compat.S | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/entry/entry_64_compat.S b/arch/x86/entry/entry_64_compat.S index 5e887ee35662..41fbb3389a2f 100644 --- a/arch/x86/entry/entry_64_compat.S +++ b/arch/x86/entry/entry_64_compat.S @@ -261,6 +261,7 @@ ENTRY(entry_INT80_compat) * Interrupts are off on entry. */ PARAVIRT_ADJUST_EXCEPTION_FRAME + ASM_CLAC /* Do this early to minimize exposure */ SWAPGS /* -- 2.5.0
| |