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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 fixes from Thomas Gleixner:
 "Misc fixes:
   - gold linker build fix
   - noxsave command line parsing fix
   - bugfix for NX setup
   - microcode resume path bug fix
   - _TIF_NOHZ versus TIF_NOHZ bugfix as discussed in the mysterious
     lockup thread"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, syscall: Fix _TIF_NOHZ handling in syscall_trace_enter_phase1
  x86, kaslr: Handle Gold linker for finding bss/brk
  x86, mm: Set NX across entire PMD at boot
  x86, microcode: Update BSPs microcode on resume
  x86: Require exact match for 'noxsave' command line option
This commit is contained in:
Linus Torvalds 2014-11-21 15:46:17 -08:00
commit c6c9161d06
5 changed files with 31 additions and 3 deletions
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2
arch/x86/kernel/cpu/common.c
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@ -146,6 +146,8 @@ EXPORT_PER_CPU_SYMBOL_GPL(gdt_page);
static int __init x86_xsave_setup(char *s)
{
if (strlen(s))
return 0;
setup_clear_cpu_cap(X86_FEATURE_XSAVE);
setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT);
setup_clear_cpu_cap(X86_FEATURE_XSAVES);

8
arch/x86/kernel/cpu/microcode/core.c
View File

@ -465,6 +465,14 @@ static void mc_bp_resume(void)
if (uci->valid && uci->mc)
microcode_ops->apply_microcode(cpu);
else if (!uci->mc)
/*
* We might resume and not have applied late microcode but still
* have a newer patch stashed from the early loader. We don't
* have it in uci->mc so we have to load it the same way we're
* applying patches early on the APs.
*/
load_ucode_ap();
}
static struct syscore_ops mc_syscore_ops = {

2
arch/x86/kernel/ptrace.c
View File

@ -1484,7 +1484,7 @@ unsigned long syscall_trace_enter_phase1(struct pt_regs *regs, u32 arch)
*/
if (work & _TIF_NOHZ) {
user_exit();
work &= ~TIF_NOHZ;
work &= ~_TIF_NOHZ;
}
#ifdef CONFIG_SECCOMP

11
arch/x86/mm/init_64.c
View File

@ -1123,7 +1123,7 @@ void mark_rodata_ro(void)
unsigned long end = (unsigned long) &__end_rodata_hpage_align;
unsigned long text_end = PFN_ALIGN(&__stop___ex_table);
unsigned long rodata_end = PFN_ALIGN(&__end_rodata);
unsigned long all_end = PFN_ALIGN(&_end);
unsigned long all_end;
printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
(end - start) >> 10);
@ -1134,7 +1134,16 @@ void mark_rodata_ro(void)
/*
* The rodata/data/bss/brk section (but not the kernel text!)
* should also be not-executable.
*
* We align all_end to PMD_SIZE because the existing mapping
* is a full PMD. If we would align _brk_end to PAGE_SIZE we
* split the PMD and the reminder between _brk_end and the end
* of the PMD will remain mapped executable.
*
* Any PMD which was setup after the one which covers _brk_end
* has been zapped already via cleanup_highmem().
*/
all_end = roundup((unsigned long)_brk_end, PMD_SIZE);
set_memory_nx(rodata_start, (all_end - rodata_start) >> PAGE_SHIFT);
rodata_test();

11
arch/x86/tools/calc_run_size.pl
View File

@ -19,7 +19,16 @@ while (<>) {
if ($file_offset == 0) {
$file_offset = $offset;
} elsif ($file_offset != $offset) {
die ".bss and .brk lack common file offset\n";
# BFD linker shows the same file offset in ELF.
# Gold linker shows them as consecutive.
next if ($file_offset + $mem_size == $offset + $size);
printf STDERR "file_offset: 0x%lx\n", $file_offset;
printf STDERR "mem_size: 0x%lx\n", $mem_size;
printf STDERR "offset: 0x%lx\n", $offset;
printf STDERR "size: 0x%lx\n", $size;
die ".bss and .brk are non-contiguous\n";
}
}
}