openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity
linux/arch/x86
History
Borislav Petkov 6620ef28c8 x86/lib/clear_page_64.S: Convert to ALTERNATIVE_2 macro 
Move clear_page() up so that we can get 2-byte forward JMPs when
patching:

  apply_alternatives: feat: 3*32+16, old: (ffffffff8130adb0, len: 5), repl: (ffffffff81d0b859, len: 5)
  ffffffff8130adb0: alt_insn: 90 90 90 90 90
  recompute_jump: new_displ: 0x0000003e
  ffffffff81d0b859: rpl_insn: eb 3e 66 66 90

even though the compiler generated 5-byte JMPs which we padded with 5
NOPs.

Also, make the REP_GOOD version be the default as the majority of
machines set REP_GOOD. This way we get to save ourselves the JMP:

  old insn VA: 0xffffffff813038b0, CPU feat: X86_FEATURE_REP_GOOD, size: 5, padlen: 0
  clear_page:

  ffffffff813038b0 <clear_page>:
  ffffffff813038b0:       e9 0b 00 00 00          jmpq ffffffff813038c0
  repl insn: 0xffffffff81cf0e92, size: 0

  old insn VA: 0xffffffff813038b0, CPU feat: X86_FEATURE_ERMS, size: 5, padlen: 0
  clear_page:

  ffffffff813038b0 <clear_page>:
  ffffffff813038b0:       e9 0b 00 00 00          jmpq ffffffff813038c0
  repl insn: 0xffffffff81cf0e92, size: 5
   ffffffff81cf0e92:      e9 69 2a 61 ff          jmpq ffffffff81303900

  ffffffff813038b0 <clear_page>:
  ffffffff813038b0:       e9 69 2a 61 ff          jmpq ffffffff8091631e

Signed-off-by: Borislav Petkov <bp@suse.de>
 		2015-02-23 13:44:16 +01:00
..
boot Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-02-21 10:41:29 -08:00
configs x86/kconfig/defconfig: Enable CONFIG_FHANDLE=y 2014-12-08 12:04:17 +01:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2015-02-14 09:47:01 -08:00
ia32 all arches, signal: move restart_block to struct task_struct 2015-02-12 18:54:12 -08:00
include x86/smap: Use ALTERNATIVE macro 2015-02-23 13:44:14 +01:00
kernel x86/entry_32: Convert X86_INVD_BUG to ALTERNATIVE macro 2015-02-23 13:44:15 +01:00
kvm Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-02-16 14:58:12 -08:00
lguest lguest: don't look in console features to find emerg_wr. 2015-02-13 17:15:51 +10:30
lib x86/lib/clear_page_64.S: Convert to ALTERNATIVE_2 macro 2015-02-23 13:44:16 +01:00
math-emu asmlinkage, x86: Add explicit __visible to arch/x86/* 2014-05-05 16:07:44 -07:00
mm Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-02-21 10:41:29 -08:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-12-10 15:48:20 -05:00
oprofile percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t 2014-08-28 08:58:57 -04:00
pci ACPI and power management updates for v3.20-rc1 2015-02-10 15:09:41 -08:00
platform Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-02-21 11:12:07 -08:00
power x86: Store a per-cpu shadow copy of CR4 2015-02-04 12:10:42 +01:00
purgatory Merge branches 'x86-build-for-linus', 'x86-cleanups-for-linus' and 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-12-10 12:35:46 -08:00
realmode Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-02-16 14:58:12 -08:00
syscalls x86: hook up execveat system call 2014-12-13 12:42:51 -08:00
tools x86, build: replace Perl script with Shell script 2015-01-26 13:37:18 -08:00
um all arches, signal: move restart_block to struct task_struct 2015-02-12 18:54:12 -08:00
vdso x86_64: add KASan support 2015-02-13 21:21:41 -08:00
video
…
xen Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-02-21 10:45:03 -08:00
.gitignore x86/build: Add arch/x86/purgatory/ make generated files to gitignore 2014-10-09 09:29:46 +02:00
Kbuild kexec: create a new config option CONFIG_KEXEC_FILE for new syscall 2014-08-29 16:28:16 -07:00
Kconfig Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-02-21 11:12:07 -08:00
Kconfig.cpu
…
Kconfig.debug x86/intel/quark: Add Isolated Memory Regions for Quark X1000 2015-02-18 23:22:47 +01:00
Makefile x86/raid6: correctly check for assembler capabilities 2015-02-04 08:35:51 +11:00
Makefile.um kbuild: do not add $(call ...) to invoke cc-version or cc-fullversion 2015-01-09 17:25:44 +01:00
Makefile_32.cpu
…