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selftests/vm/pkeys: fix alloc_random_pkey() to make it really random

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alloc_random_pkey() was allocating the same pkey every time.  Not all
pkeys were geting tested.  This fixes it.

Signed-off-by: Ram Pai <[email protected]>
Signed-off-by: Sandipan Das <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Acked-by: Dave Hansen <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Florian Weimer <[email protected]>
Cc: "Desnes A. Nunes do Rosario" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thiago Jung Bauermann <[email protected]>
Cc: "Aneesh Kumar K.V" <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Michal Suchanek <[email protected]>
Cc: Shuah Khan <[email protected]>
Link: http://lkml.kernel.org/r/0162f55816d4e783a0d6e49e554d0ab9a3c9a23b.1585646528.git.sandipan@linux.ibm.com
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ram Pai authored and Linus Torvalds committed 2020-06-04 19:06:27 -07:00
1 parent ea5f95c3d6
commit 6e373263ce
1 file changed
+2 -1
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tools/testing/selftests/vm/protection_keys.c
+2 -1
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@@ -25,6 +25,7 @@
#define __SANE_USERSPACE_TYPES__
#include <errno.h>
#include <linux/futex.h>
#include <time.h>
#include <sys/time.h>
#include <sys/syscall.h>
#include <string.h>
@@ -546,10 +547,10 @@ int alloc_random_pkey(void)
int nr_alloced = 0;
int random_index;
memset(alloced_pkeys, 0, sizeof(alloced_pkeys));
srand((unsigned int)time(NULL));
/* allocate every possible key and make a note of which ones we got */
max_nr_pkey_allocs = NR_PKEYS;
max_nr_pkey_allocs = 1;
for (i = 0; i < max_nr_pkey_allocs; i++) {
int new_pkey = alloc_pkey();
if (new_pkey < 0)