x86/pkeys/selftests: Add a test for pkey 0
Protection key 0 is the default key for all memory and will not normally come back from pkey_alloc(). But, you might still want pass it to mprotect_pkey(). This check ensures that you can use pkey 0. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michael Ellermen <mpe@ellerman.id.au> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ram Pai <linuxram@us.ibm.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20180509171356.9E40B254@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
parent
acb25d761d
commit
3488a600d9
|
@ -1184,6 +1184,35 @@ void test_pkey_alloc_exhaust(int *ptr, u16 pkey)
|
|||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* pkey 0 is special. It is allocated by default, so you do not
|
||||
* have to call pkey_alloc() to use it first. Make sure that it
|
||||
* is usable.
|
||||
*/
|
||||
void test_mprotect_with_pkey_0(int *ptr, u16 pkey)
|
||||
{
|
||||
long size;
|
||||
int prot;
|
||||
|
||||
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;
|
||||
prot = pkey_last_malloc_record->prot;
|
||||
|
||||
/* Use pkey 0 */
|
||||
mprotect_pkey(ptr, size, prot, 0);
|
||||
|
||||
/* Make sure that we can set it back to the original pkey. */
|
||||
mprotect_pkey(ptr, size, prot, pkey);
|
||||
}
|
||||
|
||||
void test_ptrace_of_child(int *ptr, u16 pkey)
|
||||
{
|
||||
__attribute__((__unused__)) int peek_result;
|
||||
|
@ -1378,6 +1407,7 @@ void (*pkey_tests[])(int *ptr, u16 pkey) = {
|
|||
test_kernel_gup_write_to_write_disabled_region,
|
||||
test_executing_on_unreadable_memory,
|
||||
test_implicit_mprotect_exec_only_memory,
|
||||
test_mprotect_with_pkey_0,
|
||||
test_ptrace_of_child,
|
||||
test_pkey_syscalls_on_non_allocated_pkey,
|
||||
test_pkey_syscalls_bad_args,
|
||||
|
|
Loading…
Reference in a new issue