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selftests/powerpc: ptrace-pkey: Update the test to mark an invalid pkey correctly

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Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200709032946.881753-22-aneesh.kumar@linux.ibm.com
This commit is contained in:
Aneesh Kumar K.V 2020-07-09 08:59:44 +05:30 committed by Michael Ellerman
parent 9a11f12e0a
commit 0eaa3b5ca7
1 changed files with 12 additions and 18 deletions
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30
tools/testing/selftests/powerpc/ptrace/ptrace-pkey.c
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@ -66,11 +66,6 @@ static int sys_pkey_alloc(unsigned long flags, unsigned long init_access_rights)
return syscall(__NR_pkey_alloc, flags, init_access_rights);
}
static int sys_pkey_free(int pkey)
{
return syscall(__NR_pkey_free, pkey);
}
static int child(struct shared_info *info)
{
unsigned long reg;
@ -100,7 +95,11 @@ static int child(struct shared_info *info)
info->amr1 |= 3ul << pkeyshift(pkey1);
info->amr2 |= 3ul << pkeyshift(pkey2);
info->invalid_amr |= info->amr2 | 3ul << pkeyshift(pkey3);
/*
* invalid amr value where we try to force write
* things which are deined by a uamor setting.
*/
info->invalid_amr = info->amr2 | (~0x0UL & ~info->expected_uamor);
if (disable_execute)
info->expected_iamr |= 1ul << pkeyshift(pkey1);
@ -111,17 +110,12 @@ static int child(struct shared_info *info)
info->expected_uamor |= 3ul << pkeyshift(pkey1) |
3ul << pkeyshift(pkey2);
info->invalid_iamr |= 1ul << pkeyshift(pkey1) | 1ul << pkeyshift(pkey2);
info->invalid_uamor |= 3ul << pkeyshift(pkey1);
/*
* We won't use pkey3. We just want a plausible but invalid key to test
* whether ptrace will let us write to AMR bits we are not supposed to.
*
* This also tests whether the kernel restores the UAMOR permissions
* after a key is freed.
* Create an IAMR value different from expected value.
* Kernel will reject an IAMR and UAMOR change.
*/
sys_pkey_free(pkey3);
info->invalid_iamr = info->expected_iamr | (1ul << pkeyshift(pkey1) | 1ul << pkeyshift(pkey2));
info->invalid_uamor = info->expected_uamor & ~(0x3ul << pkeyshift(pkey1));
printf("%-30s AMR: %016lx pkey1: %d pkey2: %d pkey3: %d\n",
user_write, info->amr1, pkey1, pkey2, pkey3);
@ -196,9 +190,9 @@ static int parent(struct shared_info *info, pid_t pid)
PARENT_SKIP_IF_UNSUPPORTED(ret, &info->child_sync);
PARENT_FAIL_IF(ret, &info->child_sync);
info->amr1 = info->amr2 = info->invalid_amr = regs[0];
info->expected_iamr = info->invalid_iamr = regs[1];
info->expected_uamor = info->invalid_uamor = regs[2];
info->amr1 = info->amr2 = regs[0];
info->expected_iamr = regs[1];
info->expected_uamor = regs[2];
/* Wake up child so that it can set itself up. */
ret = prod_child(&info->child_sync);