x86/pkeys/selftests: Save off 'prot' for allocations

This makes it possible to to tell what 'prot' a given allocation
is supposed to have.  That way, if we want to change just the
pkey, we know what 'prot' to pass to mprotect_pkey().

Also, keep a record of the most recent allocation so the tests
can easily find it.

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/20180509171354.AA23E228@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 9 insertions, 5 deletions

diff --git a/tools/testing/selftests/x86/protection_keys.c b/tools/testing/selftests/x86/protection_keys.c
index ee8176358d12..986ed38a2b25 100644
--- a/tools/testing/selftests/x86/protection_keys.c
+++ b/tools/testing/selftests/x86/protection_keys.c
@@ -677,10 +677,12 @@ int mprotect_pkey(void *ptr, size_t size, unsigned long orig_prot,
 struct pkey_malloc_record {
         void *ptr;
         long size;
+        int prot;
 };
 struct pkey_malloc_record *pkey_malloc_records;
+struct pkey_malloc_record *pkey_last_malloc_record;
 long nr_pkey_malloc_records;
-void record_pkey_malloc(void *ptr, long size)
+void record_pkey_malloc(void *ptr, long size, int prot)
 {
         long i;
         struct pkey_malloc_record *rec = NULL;
@@ -712,6 +714,8 @@ void record_pkey_malloc(void *ptr, long size)
                 (int)(rec - pkey_malloc_records), rec, ptr, size);
         rec->ptr = ptr;
         rec->size = size;
+        rec->prot = prot;
+        pkey_last_malloc_record = rec;
         nr_pkey_malloc_records++;
 }
 
@@ -756,7 +760,7 @@ void *malloc_pkey_with_mprotect(long size, int prot, u16 pkey)
         pkey_assert(ptr != (void *)-1);
         ret = mprotect_pkey((void *)ptr, PAGE_SIZE, prot, pkey);
         pkey_assert(!ret);
-        record_pkey_malloc(ptr, size);
+        record_pkey_malloc(ptr, size, prot);
         rdpkru();
 
         dprintf1("%s() for pkey %d @ %p\n", __func__, pkey, ptr);
@@ -777,7 +781,7 @@ void *malloc_pkey_anon_huge(long size, int prot, u16 pkey)
         size = ALIGN_UP(size, HPAGE_SIZE * 2);
         ptr = mmap(NULL, size, PROT_NONE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
         pkey_assert(ptr != (void *)-1);
-        record_pkey_malloc(ptr, size);
+        record_pkey_malloc(ptr, size, prot);
         mprotect_pkey(ptr, size, prot, pkey);
 
         dprintf1("unaligned ptr: %p\n", ptr);
@@ -850,7 +854,7 @@ void *malloc_pkey_hugetlb(long size, int prot, u16 pkey)
         pkey_assert(ptr != (void *)-1);
         mprotect_pkey(ptr, size, prot, pkey);
 
-        record_pkey_malloc(ptr, size);
+        record_pkey_malloc(ptr, size, prot);
 
         dprintf1("mmap()'d hugetlbfs for pkey %d @ %p\n", pkey, ptr);
         return ptr;
@@ -872,7 +876,7 @@ void *malloc_pkey_mmap_dax(long size, int prot, u16 pkey)
 
         mprotect_pkey(ptr, size, prot, pkey);
 
-        record_pkey_malloc(ptr, size);
+        record_pkey_malloc(ptr, size, prot);
 
         dprintf1("mmap()'d for pkey %d @ %p\n", pkey, ptr);
         close(fd);