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selftests/vm/pkeys: test correct behaviour of pkey-0 

Ensure that pkey-0 is allocated on start and that it can be attached
dynamically in various modes, without failures.

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/9b7c54a9b4261894fe0c7e884c70b87214ff8fbb.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 16:52:43 -07:00 committed by Linus Torvalds
parent 6e2c2d0fb7
commit fa17437cb8
1 changed files with 53 additions and 0 deletions
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53
tools/testing/selftests/vm/protection_keys.c
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@ -964,6 +964,58 @@ __attribute__((noinline)) int read_ptr(int *ptr)
return *ptr;
}
void test_pkey_alloc_free_attach_pkey0(int *ptr, u16 pkey)
{
int i, err;
int max_nr_pkey_allocs;
int alloced_pkeys[NR_PKEYS];
int nr_alloced = 0;
long size;
pkey_assert(pkey_last_malloc_record);
size = pkey_last_malloc_record->size;
/*
* This is a bit of a hack. But mprotect() requires
* huge-page-aligned sizes when operating on hugetlbfs.
* So, make sure that we use something that's a multiple
* of a huge page when we can.
*/
if (size >= HPAGE_SIZE)
size = HPAGE_SIZE;
/* allocate every possible key and make sure key-0 never got allocated */
max_nr_pkey_allocs = NR_PKEYS;
for (i = 0; i < max_nr_pkey_allocs; i++) {
int new_pkey = alloc_pkey();
pkey_assert(new_pkey != 0);
if (new_pkey < 0)
break;
alloced_pkeys[nr_alloced++] = new_pkey;
}
/* free all the allocated keys */
for (i = 0; i < nr_alloced; i++) {
int free_ret;
if (!alloced_pkeys[i])
continue;
free_ret = sys_pkey_free(alloced_pkeys[i]);
pkey_assert(!free_ret);
}
/* attach key-0 in various modes */
err = sys_mprotect_pkey(ptr, size, PROT_READ, 0);
pkey_assert(!err);
err = sys_mprotect_pkey(ptr, size, PROT_WRITE, 0);
pkey_assert(!err);
err = sys_mprotect_pkey(ptr, size, PROT_EXEC, 0);
pkey_assert(!err);
err = sys_mprotect_pkey(ptr, size, PROT_READ|PROT_WRITE, 0);
pkey_assert(!err);
err = sys_mprotect_pkey(ptr, size, PROT_READ|PROT_WRITE|PROT_EXEC, 0);
pkey_assert(!err);
}
void test_read_of_write_disabled_region(int *ptr, u16 pkey)
{
int ptr_contents;
@ -1448,6 +1500,7 @@ void (*pkey_tests[])(int *ptr, u16 pkey) = {
test_pkey_syscalls_on_non_allocated_pkey,
test_pkey_syscalls_bad_args,
test_pkey_alloc_exhaust,
test_pkey_alloc_free_attach_pkey0,
};
void run_tests_once(void)