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x86/pkeys/selftests: Factor out "instruction page" 

We currently have an execute-only test, but it is for
the explicit mprotect_pkey() interface.  We will soon
add a test for the implicit mprotect(PROT_EXEC)
enterface.  We need this code in both tests.

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/20180509171347.C64AB733@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dave Hansen 2018-05-09 10:13:47 -07:00 committed by Ingo Molnar
parent 7e7fd67ca3
commit 3fcd2b2d92
1 changed files with 17 additions and 4 deletions
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21
tools/testing/selftests/x86/protection_keys.c
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@ -1253,12 +1253,9 @@ void test_ptrace_of_child(int *ptr, u16 pkey)
free(plain_ptr_unaligned);
}
void test_executing_on_unreadable_memory(int *ptr, u16 pkey)
void *get_pointer_to_instructions(void)
{
void *p1;
int scratch;
int ptr_contents;
int ret;
p1 = ALIGN_PTR_UP(&lots_o_noops_around_write, PAGE_SIZE);
dprintf3("&lots_o_noops: %p\n", &lots_o_noops_around_write);
@ -1268,7 +1265,23 @@ void test_executing_on_unreadable_memory(int *ptr, u16 pkey)
/* Point 'p1' at the *second* page of the function: */
p1 += PAGE_SIZE;
/*
* Try to ensure we fault this in on next touch to ensure
* we get an instruction fault as opposed to a data one
*/
madvise(p1, PAGE_SIZE, MADV_DONTNEED);
return p1;
}
void test_executing_on_unreadable_memory(int *ptr, u16 pkey)
{
void *p1;
int scratch;
int ptr_contents;
int ret;
p1 = get_pointer_to_instructions();
lots_o_noops_around_write(&scratch);
ptr_contents = read_ptr(p1);
dprintf2("ptr (%p) contents@%d: %x\n", p1, __LINE__, ptr_contents);