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- Complete the MSR write filtering by applying it to the MSR ioctl

Browse source 
interface too.
 
 - Other misc small fixups.
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Merge tag 'x86_misc_for_v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 misc updates from Borislav Petkov:

 - Complete the MSR write filtering by applying it to the MSR ioctl
   interface too.

 - Other misc small fixups.

* tag 'x86_misc_for_v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/MSR: Filter MSR writes through X86_IOC_WRMSR_REGS ioctl too
  selftests/fpu: Fix debugfs_simple_attr.cocci warning
  selftests/x86: Use __builtin_ia32_read/writeeflags
  x86/reboot: Add Zotac ZBOX CI327 nano PCI reboot quirk
This commit is contained in:
Linus Torvalds 2021-02-20 19:44:19 -08:00
commit 317d4f4593
4 changed files with 23 additions and 23 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
arch/x86/kernel/msr.c
View file

@ -182,6 +182,13 @@ static long msr_ioctl(struct file *file, unsigned int ioc, unsigned long arg)
err = security_locked_down(LOCKDOWN_MSR);
if (err)
break;
err = filter_write(regs[1]);
if (err)
return err;
add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
err = wrmsr_safe_regs_on_cpu(cpu, regs);
if (err)
break;

9
arch/x86/kernel/reboot.c
View file

@ -477,6 +477,15 @@ static const struct dmi_system_id reboot_dmi_table[] __initconst = {
},
},
{ /* PCIe Wifi card isn't detected after reboot otherwise */
.callback = set_pci_reboot,
.ident = "Zotac ZBOX CI327 nano",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "NA"),
DMI_MATCH(DMI_PRODUCT_NAME, "ZBOX-CI327NANO-GS-01"),
},
},
/* Sony */
{ /* Handle problems with rebooting on Sony VGN-Z540N */
.callback = set_bios_reboot,

6
lib/test_fpu.c
View file

@ -63,7 +63,7 @@ static int test_fpu_get(void *data, u64 *val)
return status;
}
DEFINE_SIMPLE_ATTRIBUTE(test_fpu_fops, test_fpu_get, NULL, "%lld\n");
DEFINE_DEBUGFS_ATTRIBUTE(test_fpu_fops, test_fpu_get, NULL, "%lld\n");
static struct dentry *selftest_dir;
static int __init test_fpu_init(void)
@ -72,8 +72,8 @@ static int __init test_fpu_init(void)
if (!selftest_dir)
return -ENOMEM;
debugfs_create_file("test_fpu", 0444, selftest_dir, NULL,
&test_fpu_fops);
debugfs_create_file_unsafe("test_fpu", 0444, selftest_dir, NULL,
&test_fpu_fops);
return 0;
}

24
tools/testing/selftests/x86/helpers.h
View file

@ -6,36 +6,20 @@
static inline unsigned long get_eflags(void)
{
unsigned long eflags;
asm volatile (
#ifdef __x86_64__
"subq $128, %%rsp\n\t"
"pushfq\n\t"
"popq %0\n\t"
"addq $128, %%rsp"
return __builtin_ia32_readeflags_u64();
#else
"pushfl\n\t"
"popl %0"
return __builtin_ia32_readeflags_u32();
#endif
: "=r" (eflags) :: "memory");
return eflags;
}
static inline void set_eflags(unsigned long eflags)
{
asm volatile (
#ifdef __x86_64__
"subq $128, %%rsp\n\t"
"pushq %0\n\t"
"popfq\n\t"
"addq $128, %%rsp"
__builtin_ia32_writeeflags_u64(eflags);
#else
"pushl %0\n\t"
"popfl"
__builtin_ia32_writeeflags_u32(eflags);
#endif
:: "r" (eflags) : "flags", "memory");
}
#endif /* __SELFTESTS_X86_HELPERS_H */