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selftests/vm/pkeys: improve checks to determine pkey support

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For the pkeys subsystem to work, both the CPU and the kernel need to have
support.  So, additionally check if the kernel supports pkeys apart from
the CPU feature checks.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "Desnes A. Nunes do Rosario" <desnesn@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Suchanek <msuchanek@suse.de>
Cc: Shuah Khan <shuah@kernel.org>
Link: http://lkml.kernel.org/r/8fb76c63ebdadcf068ecd2d23731032e195cd364.1585646528.git.sandipan@linux.ibm.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ram Pai 2020-06-04 16:52:25 -07:00 committed by Linus Torvalds
parent b0acc5d6bf
commit 94c8a223de
4 changed files with 37 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
tools/testing/selftests/vm/pkey-helpers.h
View File

@ -76,6 +76,8 @@ extern void abort_hooks(void);
__attribute__((noinline)) int read_ptr(int *ptr);
void expected_pkey_fault(int pkey);
int sys_pkey_alloc(unsigned long flags, unsigned long init_val);
int sys_pkey_free(unsigned long pkey);
#if defined(__i386__) || defined(__x86_64__) /* arch */
#include "pkey-x86.h"
@ -186,4 +188,32 @@ static inline u32 *siginfo_get_pkey_ptr(siginfo_t *si)
#endif
}
static inline int kernel_has_pkeys(void)
{
/* try allocating a key and see if it succeeds */
int ret = sys_pkey_alloc(0, 0);
if (ret <= 0) {
return 0;
}
sys_pkey_free(ret);
return 1;
}
static inline int is_pkeys_supported(void)
{
/* check if the cpu supports pkeys */
if (!cpu_has_pkeys()) {
dprintf1("SKIP: %s: no CPU support\n", __func__);
return 0;
}
/* check if the kernel supports pkeys */
if (!kernel_has_pkeys()) {
dprintf1("SKIP: %s: no kernel support\n", __func__);
return 0;
}
return 1;
}
#endif /* _PKEYS_HELPER_H */

3
tools/testing/selftests/vm/pkey-powerpc.h
View File

@ -64,8 +64,9 @@ static inline void __write_pkey_reg(u64 pkey_reg)
__func__, __read_pkey_reg(), pkey_reg);
}
static inline int cpu_has_pku(void)
static inline int cpu_has_pkeys(void)
{
/* No simple way to determine this */
return 1;
}

2
tools/testing/selftests/vm/pkey-x86.h
View File

@ -97,7 +97,7 @@ static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
#define X86_FEATURE_PKU (1<<3) /* Protection Keys for Userspace */
#define X86_FEATURE_OSPKE (1<<4) /* OS Protection Keys Enable */
static inline int cpu_has_pku(void)
static inline int cpu_has_pkeys(void)
{
unsigned int eax;
unsigned int ebx;

7
tools/testing/selftests/vm/protection_keys.c
View File

@ -1378,7 +1378,7 @@ void test_mprotect_pkey_on_unsupported_cpu(int *ptr, u16 pkey)
int size = PAGE_SIZE;
int sret;
if (cpu_has_pku()) {
if (cpu_has_pkeys()) {
dprintf1("SKIP: %s: no CPU support\n", __func__);
return;
}
@ -1447,12 +1447,13 @@ void pkey_setup_shadow(void)
int main(void)
{
int nr_iterations = 22;
int pkeys_supported = is_pkeys_supported();
setup_handlers();
printf("has pku: %d\n", cpu_has_pku());
printf("has pkeys: %d\n", pkeys_supported);
if (!cpu_has_pku()) {
if (!pkeys_supported) {
int size = PAGE_SIZE;
int *ptr;