Check ProtectionKey field in /proc/*/smaps output, if system supports page-based memory permissions.
Signed-off-by: Swarup Laxman Kotiaklapudi swarupkotikalapudi@gmail.com --- tools/testing/selftests/proc/proc-empty-vm.c | 38 ++++++++++++-------- 1 file changed, 23 insertions(+), 15 deletions(-)
diff --git a/tools/testing/selftests/proc/proc-empty-vm.c b/tools/testing/selftests/proc/proc-empty-vm.c index b16c13688b88..4842f923235c 100644 --- a/tools/testing/selftests/proc/proc-empty-vm.c +++ b/tools/testing/selftests/proc/proc-empty-vm.c @@ -37,6 +37,7 @@ #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> +#include "../kselftest.h"
#ifdef __amd64__ #define TEST_VSYSCALL @@ -83,10 +84,7 @@ static const char proc_pid_smaps_vsyscall_1[] = "SwapPss: 0 kB\n" "Locked: 0 kB\n" "THPeligible: 0\n" -/* - * "ProtectionKey:" field is conditional. It is possible to check it as well, - * but I don't have such machine. - */ +"ProtectionKey: 0\n" ;
static const char proc_pid_smaps_vsyscall_2[] = @@ -113,10 +111,7 @@ static const char proc_pid_smaps_vsyscall_2[] = "SwapPss: 0 kB\n" "Locked: 0 kB\n" "THPeligible: 0\n" -/* - * "ProtectionKey:" field is conditional. It is possible to check it as well, - * but I'm too tired. - */ +"ProtectionKey: 0\n" ;
static void sigaction_SIGSEGV(int _, siginfo_t *__, void *___) @@ -241,13 +236,26 @@ static int test_proc_pid_smaps(pid_t pid) } else { ssize_t rv = read(fd, buf, sizeof(buf)); close(fd); - if (g_vsyscall == 0) { - assert(rv == 0); - } else { - size_t len = strlen(g_proc_pid_maps_vsyscall); - /* TODO "ProtectionKey:" */ - assert(rv > len); - assert(memcmp(buf, g_proc_pid_maps_vsyscall, len) == 0); + assert(rv >= 0); + assert(rv <= sizeof(buf)); + if (g_vsyscall != 0) { + int pkey = pkey_alloc(0, 0); + + if (pkey < 0) { + size_t len = strlen(g_proc_pid_maps_vsyscall); + + assert(rv > len); + assert(memcmp(buf, g_proc_pid_maps_vsyscall, len) == 0); + } else { + pkey_free(pkey); + static const char * const S[] = { + "ProtectionKey: 0\n" + }; + int i; + + for (i = 0; i < ARRAY_SIZE(S); i++) + assert(memmem(buf, rv, S[i], strlen(S[i]))); + } } return EXIT_SUCCESS; }
On Thu, Oct 26, 2023 at 01:06:27AM +0530, Swarup Laxman Kotiaklapudi wrote:
Check ProtectionKey field in /proc/*/smaps output, if system supports page-based memory permissions.
--- a/tools/testing/selftests/proc/proc-empty-vm.c +++ b/tools/testing/selftests/proc/proc-empty-vm.c @@ -37,6 +37,7 @@ #include <sys/types.h> #include <sys/wait.h> #include <unistd.h> +#include "../kselftest.h"
I'd rather not include stuff. The reason is that this include makes the test not (less) self-contained so it requires copying two files to some machine where it is broken for debugging.
@@ -83,10 +84,7 @@ static const char proc_pid_smaps_vsyscall_1[] = "SwapPss: 0 kB\n" "Locked: 0 kB\n" "THPeligible: 0\n" -/*
- "ProtectionKey:" field is conditional. It is possible to check it as well,
- but I don't have such machine.
- */
+"ProtectionKey: 0\n" ; static const char proc_pid_smaps_vsyscall_2[] = @@ -113,10 +111,7 @@ static const char proc_pid_smaps_vsyscall_2[] = "SwapPss: 0 kB\n" "Locked: 0 kB\n" "THPeligible: 0\n" -/*
- "ProtectionKey:" field is conditional. It is possible to check it as well,
- but I'm too tired.
- */
+"ProtectionKey: 0\n" ; static void sigaction_SIGSEGV(int _, siginfo_t *__, void *___) @@ -241,13 +236,26 @@ static int test_proc_pid_smaps(pid_t pid) } else { ssize_t rv = read(fd, buf, sizeof(buf)); close(fd);
if (g_vsyscall == 0) {assert(rv == 0);} else {size_t len = strlen(g_proc_pid_maps_vsyscall);/* TODO "ProtectionKey:" */assert(rv > len);assert(memcmp(buf, g_proc_pid_maps_vsyscall, len) == 0);
assert(rv >= 0);assert(rv <= sizeof(buf));if (g_vsyscall != 0) {int pkey = pkey_alloc(0, 0);
I'd call syscall(). glibc might not have pkey_alloc(3) [[citation needed]] And I'd move this pkey support testing to the very beginning (like vsyscall).
if (pkey < 0) {size_t len = strlen(g_proc_pid_maps_vsyscall);
OK this test was broken, but it is not your fault. See my next patch.
assert(rv > len);assert(memcmp(buf, g_proc_pid_maps_vsyscall, len) == 0);} else {pkey_free(pkey);static const char * const S[] = {"ProtectionKey: 0\n"};int i;for (i = 0; i < ARRAY_SIZE(S); i++)assert(memmem(buf, rv, S[i], strlen(S[i])));}
OK-ish.
linux-kselftest-mirror@lists.linaro.org
-
Alexey Dobriyan -
Swarup Laxman Kotiaklapudi