The patch titled
Subject: selftests/mm: allow uffd test to skip properly with no privilege
has been added to the -mm mm-unstable branch. Its filename is
selftests-mm-allow-uffd-test-to-skip-properly-with-no-privilege.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-allow-uffd-test-to-skip-properly-with-no-privilege.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Peter Xu <peterx@xxxxxxxxxx>
Subject: selftests/mm: allow uffd test to skip properly with no privilege
Date: Wed, 12 Apr 2023 12:45:20 -0400
Allow skip a unit test properly due to no privilege (e.g. sigbus and
events tests).
Link: https://lkml.kernel.org/r/20230412164520.329163-1-peterx@xxxxxxxxxx
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Cc: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Dmitry Safonov <0x7f454c46@xxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: Zach O'Keefe <zokeefe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/uffd-common.c | 27 ++++++++++-------
tools/testing/selftests/mm/uffd-common.h | 4 +-
tools/testing/selftests/mm/uffd-stress.c | 6 ++-
tools/testing/selftests/mm/uffd-unit-tests.c | 10 +++---
4 files changed, 29 insertions(+), 18 deletions(-)
--- a/tools/testing/selftests/mm/uffd-common.c~selftests-mm-allow-uffd-test-to-skip-properly-with-no-privilege
+++ a/tools/testing/selftests/mm/uffd-common.c
@@ -232,7 +232,7 @@ void uffd_stats_report(struct uffd_args
printf("\n");
}
-void userfaultfd_open(uint64_t *features)
+int userfaultfd_open(uint64_t *features)
{
struct uffdio_api uffdio_api;
@@ -241,18 +241,19 @@ void userfaultfd_open(uint64_t *features
else
uffd = uffd_open_sys(UFFD_FLAGS);
if (uffd < 0)
- err("uffd open failed (dev=%d)", test_dev_userfaultfd);
+ return -1;
uffd_flags = fcntl(uffd, F_GETFD, NULL);
uffdio_api.api = UFFD_API;
uffdio_api.features = *features;
if (ioctl(uffd, UFFDIO_API, &uffdio_api))
- err("UFFDIO_API failed.\nPlease make sure to "
- "run with either root or ptrace capability.");
+ /* Probably lack of CAP_PTRACE? */
+ return -1;
if (uffdio_api.api != UFFD_API)
err("UFFDIO_API error: %" PRIu64, (uint64_t)uffdio_api.api);
*features = uffdio_api.features;
+ return 0;
}
static inline void munmap_area(void **area)
@@ -295,7 +296,7 @@ static void uffd_test_ctx_clear(void)
munmap_area((void **)&area_remap);
}
-int uffd_test_ctx_init(uint64_t features)
+int uffd_test_ctx_init(uint64_t features, const char **errmsg)
{
unsigned long nr, cpu;
int ret;
@@ -303,13 +304,19 @@ int uffd_test_ctx_init(uint64_t features
uffd_test_ctx_clear();
ret = uffd_test_ops->allocate_area((void **)&area_src, true);
- if (ret)
- return ret;
- ret = uffd_test_ops->allocate_area((void **)&area_dst, false);
- if (ret)
+ ret |= uffd_test_ops->allocate_area((void **)&area_dst, false);
+ if (ret) {
+ if (errmsg)
+ *errmsg = "memory allocation failed";
return ret;
+ }
- userfaultfd_open(&features);
+ ret = userfaultfd_open(&features);
+ if (ret) {
+ if (errmsg)
+ *errmsg = "possible lack of priviledge";
+ return ret;
+ }
count_verify = malloc(nr_pages * sizeof(unsigned long long));
if (!count_verify)
--- a/tools/testing/selftests/mm/uffd-common.h~selftests-mm-allow-uffd-test-to-skip-properly-with-no-privilege
+++ a/tools/testing/selftests/mm/uffd-common.h
@@ -101,8 +101,8 @@ extern uffd_test_ops_t hugetlb_uffd_test
extern uffd_test_ops_t *uffd_test_ops;
void uffd_stats_report(struct uffd_args *args, int n_cpus);
-int uffd_test_ctx_init(uint64_t features);
-void userfaultfd_open(uint64_t *features);
+int uffd_test_ctx_init(uint64_t features, const char **errmsg);
+int userfaultfd_open(uint64_t *features);
int uffd_read_msg(int ufd, struct uffd_msg *msg);
void wp_range(int ufd, __u64 start, __u64 len, bool wp);
void uffd_handle_page_fault(struct uffd_msg *msg, struct uffd_args *args);
--- a/tools/testing/selftests/mm/uffd-stress.c~selftests-mm-allow-uffd-test-to-skip-properly-with-no-privilege
+++ a/tools/testing/selftests/mm/uffd-stress.c
@@ -271,7 +271,8 @@ static int userfaultfd_stress(void)
struct uffd_args args[nr_cpus];
uint64_t mem_size = nr_pages * page_size;
- uffd_test_ctx_init(UFFD_FEATURE_WP_UNPOPULATED);
+ if (uffd_test_ctx_init(UFFD_FEATURE_WP_UNPOPULATED, NULL))
+ err("context init failed");
if (posix_memalign(&area, page_size, page_size))
err("out of memory");
@@ -435,7 +436,8 @@ static void parse_test_type_arg(const ch
* feature.
*/
- userfaultfd_open(&features);
+ if (userfaultfd_open(&features))
+ err("Userfaultfd open failed");
test_uffdio_wp = test_uffdio_wp &&
(features & UFFD_FEATURE_PAGEFAULT_FLAG_WP);
--- a/tools/testing/selftests/mm/uffd-unit-tests.c~selftests-mm-allow-uffd-test-to-skip-properly-with-no-privilege
+++ a/tools/testing/selftests/mm/uffd-unit-tests.c
@@ -172,7 +172,8 @@ out:
* This function initializes the global variables. TODO: remove global
* vars and then remove this.
*/
-static int uffd_setup_environment(uffd_test_case_t *test, mem_type_t *mem_type)
+static int uffd_setup_environment(uffd_test_case_t *test, mem_type_t *mem_type,
+ const char **errmsg)
{
map_shared = mem_type->shared;
uffd_test_ops = mem_type->mem_ops;
@@ -186,7 +187,7 @@ static int uffd_setup_environment(uffd_t
/* TODO: remove this global var.. it's so ugly */
nr_cpus = 1;
- return uffd_test_ctx_init(test->uffd_feature_required);
+ return uffd_test_ctx_init(test->uffd_feature_required, errmsg);
}
static bool uffd_feature_supported(uffd_test_case_t *test)
@@ -835,6 +836,7 @@ int main(int argc, char *argv[])
uffd_test_case_t *test;
mem_type_t *mem_type;
char test_name[128];
+ const char *errmsg;
int has_uffd;
int i, j;
@@ -860,8 +862,8 @@ int main(int argc, char *argv[])
uffd_test_skip("feature missing");
continue;
}
- if (uffd_setup_environment(test, mem_type)) {
- uffd_test_skip("environment setup failed");
+ if (uffd_setup_environment(test, mem_type, &errmsg)) {
+ uffd_test_skip(errmsg);
continue;
}
test->uffd_fn();
_
Patches currently in -mm which might be from peterx@xxxxxxxxxx are
mm-khugepaged-check-again-on-anon-uffd-wp-during-isolation.patch
revert-userfaultfd-dont-fail-on-unrecognized-features.patch
selftests-mm-update-gitignore-with-two-missing-tests.patch
selftests-mm-dump-a-summary-in-run_vmtestssh.patch
selftests-mm-merge-utilh-into-vm_utilh.patch
selftests-mm-use-test_gen_progs-where-proper.patch
selftests-mm-link-vm_utilc-always.patch
selftests-mm-merge-default_huge_page_size-into-one.patch
selftests-mm-use-pm_-macros-in-vm_utilsh.patch
selftests-mm-reuse-pagemap_get_entry-in-vm_utilh.patch
selftests-mm-test-uffdio_zeropage-only-when-hugetlb.patch
selftests-mm-drop-test_uffdio_zeropage_eexist.patch
selftests-mm-create-uffd-common.patch
selftests-mm-split-uffd-tests-into-uffd-stress-and-uffd-unit-tests.patch
selftests-mm-uffd_register.patch
selftests-mm-uffd_open_devsys.patch
selftests-mm-uffdio_api-test.patch
selftests-mm-drop-global-mem_fd-in-uffd-tests.patch
selftests-mm-drop-global-hpage_size-in-uffd-tests.patch
selftests-mm-rename-uffd_stats-to-uffd_args.patch
selftests-mm-let-uffd_handle_page_fault-take-wp-parameter.patch
selftests-mm-allow-allocate_area-to-fail-properly.patch
selftests-mm-add-framework-for-uffd-unit-test.patch
selftests-mm-move-uffd-pagemap-test-to-unit-test.patch
selftests-mm-move-uffd-minor-test-to-unit-test.patch
selftests-mm-move-uffd-sig-events-tests-into-uffd-unit-tests.patch
selftests-mm-move-zeropage-test-into-uffd-unit-tests.patch
selftests-mm-workaround-no-way-to-detect-uffd-minor-wp.patch
selftests-mm-allow-uffd-test-to-skip-properly-with-no-privilege.patch
selftests-mm-drop-sys-dev-test-in-uffd-stress-test.patch
selftests-mm-add-shmem-private-test-to-uffd-stress.patch
selftests-mm-add-uffdio-register-ioctls-test.patch
