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linux-sg2042
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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 fixes from Ingo Molnar:
 "Two fixes: a quirk for KVM guests running on certain AMD CPUs, and a
  KASAN related build fix"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/CPU/AMD: Don't force the CPB cap when running under a hypervisor
  x86/boot: Provide KASAN compatible aliases for string routines
This commit is contained in:
Linus Torvalds 2019-06-02 11:10:01 -07:00
parent 6751b8d91a 2ac44ab608
commit 7bd1d5edd0
2 changed files with 15 additions and 6 deletions
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14
arch/x86/boot/compressed/string.c
View File

@ -11,7 +11,7 @@
#include "../string.c"
#ifdef CONFIG_X86_32
static void *__memcpy(void *dest, const void *src, size_t n)
static void *____memcpy(void *dest, const void *src, size_t n)
{
int d0, d1, d2;
asm volatile(
@ -25,7 +25,7 @@ static void *__memcpy(void *dest, const void *src, size_t n)
return dest;
}
#else
static void *__memcpy(void *dest, const void *src, size_t n)
static void *____memcpy(void *dest, const void *src, size_t n)
{
long d0, d1, d2;
asm volatile(
@ -56,7 +56,7 @@ void *memmove(void *dest, const void *src, size_t n)
const unsigned char *s = src;
if (d <= s || d - s >= n)
return __memcpy(dest, src, n);
return ____memcpy(dest, src, n);
while (n-- > 0)
d[n] = s[n];
@ -71,5 +71,11 @@ void *memcpy(void *dest, const void *src, size_t n)
warn("Avoiding potentially unsafe overlapping memcpy()!");
return memmove(dest, src, n);
}
return __memcpy(dest, src, n);
return ____memcpy(dest, src, n);
}
#ifdef CONFIG_KASAN
extern void *__memset(void *s, int c, size_t n) __alias(memset);
extern void *__memmove(void *dest, const void *src, size_t n) __alias(memmove);
extern void *__memcpy(void *dest, const void *src, size_t n) __alias(memcpy);
#endif

7
arch/x86/kernel/cpu/amd.c
View File

@ -824,8 +824,11 @@ static void init_amd_zn(struct cpuinfo_x86 *c)
{
set_cpu_cap(c, X86_FEATURE_ZEN);
/* Fix erratum 1076: CPB feature bit not being set in CPUID. */
if (!cpu_has(c, X86_FEATURE_CPB))
/*
* Fix erratum 1076: CPB feature bit not being set in CPUID.
* Always set it, except when running under a hypervisor.
*/
if (!cpu_has(c, X86_FEATURE_HYPERVISOR) && !cpu_has(c, X86_FEATURE_CPB))
set_cpu_cap(c, X86_FEATURE_CPB);
}