kernel.git/arch/x86/lib/putuser.S, branch linux-3.11.yHosts the 0x221E linux distro kernel.
https://git.0xinfinity.dev/distro/kernel.git/atom?h=linux-3.11.y2012-09-21T19:45:27Zx86, smap: Add STAC and CLAC instructions to control user space access2012-09-21T19:45:27ZH. Peter Anvin2012-09-21T19:43:12Zurn:sha1:63bcff2a307b9bcc712a8251eb27df8b2e117967
When Supervisor Mode Access Prevention (SMAP) is enabled, access to
userspace from the kernel is controlled by the AC flag. To make the
performance of manipulating that flag acceptable, there are two new
instructions, STAC and CLAC, to set and clear it.
This patch adds those instructions, via alternative(), when the SMAP
feature is enabled. It also adds X86_EFLAGS_AC unconditionally to the
SYSCALL entry mask; there is simply no reason to make that one
conditional.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Link: http://lkml.kernel.org/r/1348256595-29119-9-git-send-email-hpa@linux.intel.com
x86, extable: Remove open-coded exception table entries in arch/x86/lib/putuser.S2012-04-20T20:51:39ZH. Peter Anvin2012-04-20T19:19:52Zurn:sha1:a53a96e5413d3639ed75d202bbfe68aa0a56c091
Remove open-coded exception table entries in arch/x86/lib/putuser.S,
and replace them with _ASM_EXTABLE() macros; this will allow us to
change the format and type of the exception table entries.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: David Daney <david.daney@cavium.com>
Link: http://lkml.kernel.org/r/CA%2B55aFyijf43qSu3N9nWHEBwaGbb7T2Oq9A=9EyR=Jtyqfq_cQ@mail.gmail.com
x86: merge putuser asm functions.2008-07-09T07:14:13ZGlauber Costa2008-06-24T20:40:14Zurn:sha1:5cbbc3b1eb37bdc72eefd2de03b39f5e784400c2
putuser_32.S and putuser_64.S are merged into putuser.S.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>