From 9a6a6a3191574a01dcf7a7d9385246d7bc8736bc Mon Sep 17 00:00:00 2001 From: Lorenzo Stoakes Date: Mon, 11 Aug 2025 06:26:54 +0100 Subject: tools/testing: add linux/args.h header and fix radix, VMA tests Commit 857d18f23ab1 ("cleanup: Introduce ACQUIRE() and ACQUIRE_ERR() for conditional locks") accidentally broke the radix tree, VMA userland tests by including linux/args.h which is not present in the tools/include directory. This patch copies this over and adds an #ifdef block to avoid duplicate __CONCAT declaration in conflict with system headers when we ultimately include this. Link: https://lkml.kernel.org/r/20250811052654.33286-1-lorenzo.stoakes@oracle.com Fixes: 857d18f23ab1 ("cleanup: Introduce ACQUIRE() and ACQUIRE_ERR() for conditional locks") Signed-off-by: Lorenzo Stoakes Cc: Jann Horn Cc: John Hubbard Cc: Liam Howlett Cc: Sidhartha Kumar Cc: Vlastimil Babka Cc: Dan Williams Cc: Peter Zijlstra Signed-off-by: Andrew Morton --- tools/testing/shared/linux/idr.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'tools/testing') diff --git a/tools/testing/shared/linux/idr.h b/tools/testing/shared/linux/idr.h index 4e342f2e37cf..676c5564e33f 100644 --- a/tools/testing/shared/linux/idr.h +++ b/tools/testing/shared/linux/idr.h @@ -1 +1,5 @@ +/* Avoid duplicate definitions due to system headers. */ +#ifdef __CONCAT +#undef __CONCAT +#endif #include "../../../../include/linux/idr.h" -- cgit v1.2.3 From 742d3663a5775cb7b957f4ca2ddb4ccd26badb94 Mon Sep 17 00:00:00 2001 From: Lorenzo Stoakes Date: Sun, 3 Aug 2025 12:11:23 +0100 Subject: selftests/mm: add test for invalid multi VMA operations We can use UFFD to easily assert invalid multi VMA moves, so do so, asserting expected behaviour when VMAs invalid for a multi VMA operation are encountered. We assert both that such operations are not permitted, and that we do not even attempt to move the first VMA under these circumstances. We also assert that we can still move a single VMA regardless. We then assert that a partial failure can occur if the invalid VMA appears later in the range of multiple VMAs, both at the very next VMA, and also at the end of the range. As part of this change, we are using the is_range_valid() helper more aggressively. Therefore, fix a bug where stale buffered data would hang around on success, causing subsequent calls to is_range_valid() to potentially give invalid results. We simply have to fflush() the stream on success to resolve this issue. Link: https://lkml.kernel.org/r/c4fb86dd5ba37610583ad5fc0e0c2306ddf318b9.1754218667.git.lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes Cc: David Hildenbrand Cc: Jann Horn Cc: Liam Howlett Cc: Michal Hocko Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/mremap_test.c | 264 ++++++++++++++++++++++++++++++- 1 file changed, 261 insertions(+), 3 deletions(-) (limited to 'tools/testing') diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selftests/mm/mremap_test.c index fccf9e797a0c..5bd52a951cbd 100644 --- a/tools/testing/selftests/mm/mremap_test.c +++ b/tools/testing/selftests/mm/mremap_test.c @@ -5,10 +5,14 @@ #define _GNU_SOURCE #include +#include +#include #include #include #include +#include #include +#include #include #include @@ -168,6 +172,7 @@ static bool is_range_mapped(FILE *maps_fp, unsigned long start, if (first_val <= start && second_val >= end) { success = true; + fflush(maps_fp); break; } } @@ -175,6 +180,15 @@ static bool is_range_mapped(FILE *maps_fp, unsigned long start, return success; } +/* Check if [ptr, ptr + size) mapped in /proc/self/maps. */ +static bool is_ptr_mapped(FILE *maps_fp, void *ptr, unsigned long size) +{ + unsigned long start = (unsigned long)ptr; + unsigned long end = start + size; + + return is_range_mapped(maps_fp, start, end); +} + /* * Returns the start address of the mapping on success, else returns * NULL on failure. @@ -733,6 +747,249 @@ out: dont_unmap ? " [dontunnmap]" : ""); } +#ifdef __NR_userfaultfd +static void mremap_move_multi_invalid_vmas(FILE *maps_fp, + unsigned long page_size) +{ + char *test_name = "mremap move multiple invalid vmas"; + const size_t size = 10 * page_size; + bool success = true; + char *ptr, *tgt_ptr; + int uffd, err, i; + void *res; + struct uffdio_api api = { + .api = UFFD_API, + .features = UFFD_EVENT_PAGEFAULT, + }; + + uffd = syscall(__NR_userfaultfd, O_NONBLOCK); + if (uffd == -1) { + err = errno; + perror("userfaultfd"); + if (err == EPERM) { + ksft_test_result_skip("%s - missing uffd", test_name); + return; + } + success = false; + goto out; + } + if (ioctl(uffd, UFFDIO_API, &api)) { + perror("ioctl UFFDIO_API"); + success = false; + goto out_close_uffd; + } + + ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANON, -1, 0); + if (ptr == MAP_FAILED) { + perror("mmap"); + success = false; + goto out_close_uffd; + } + + tgt_ptr = mmap(NULL, size, PROT_NONE, MAP_PRIVATE | MAP_ANON, -1, 0); + if (tgt_ptr == MAP_FAILED) { + perror("mmap"); + success = false; + goto out_close_uffd; + } + if (munmap(tgt_ptr, size)) { + perror("munmap"); + success = false; + goto out_unmap; + } + + /* + * Unmap so we end up with: + * + * 0 2 4 6 8 10 offset in buffer + * |*| |*| |*| |*| |*| + * |*| |*| |*| |*| |*| + * + * Additionally, register each with UFFD. + */ + for (i = 0; i < 10; i += 2) { + void *unmap_ptr = &ptr[(i + 1) * page_size]; + unsigned long start = (unsigned long)&ptr[i * page_size]; + struct uffdio_register reg = { + .range = { + .start = start, + .len = page_size, + }, + .mode = UFFDIO_REGISTER_MODE_MISSING, + }; + + if (ioctl(uffd, UFFDIO_REGISTER, ®) == -1) { + perror("ioctl UFFDIO_REGISTER"); + success = false; + goto out_unmap; + } + if (munmap(unmap_ptr, page_size)) { + perror("munmap"); + success = false; + goto out_unmap; + } + } + + /* + * Now try to move the entire range which is invalid for multi VMA move. + * + * This will fail, and no VMA should be moved, as we check this ahead of + * time. + */ + res = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, tgt_ptr); + err = errno; + if (res != MAP_FAILED) { + fprintf(stderr, "mremap() succeeded for multi VMA uffd armed\n"); + success = false; + goto out_unmap; + } + if (err != EFAULT) { + errno = err; + perror("mrmeap() unexpected error"); + success = false; + goto out_unmap; + } + if (is_ptr_mapped(maps_fp, tgt_ptr, page_size)) { + fprintf(stderr, + "Invalid uffd-armed VMA at start of multi range moved\n"); + success = false; + goto out_unmap; + } + + /* + * Now try to move a single VMA, this should succeed as not multi VMA + * move. + */ + res = mremap(ptr, page_size, page_size, + MREMAP_MAYMOVE | MREMAP_FIXED, tgt_ptr); + if (res == MAP_FAILED) { + perror("mremap single invalid-multi VMA"); + success = false; + goto out_unmap; + } + + /* + * Unmap the VMA, and remap a non-uffd registered (therefore, multi VMA + * move valid) VMA at the start of ptr range. + */ + if (munmap(tgt_ptr, page_size)) { + perror("munmap"); + success = false; + goto out_unmap; + } + res = mmap(ptr, page_size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANON | MAP_FIXED, -1, 0); + if (res == MAP_FAILED) { + perror("mmap"); + success = false; + goto out_unmap; + } + + /* + * Now try to move the entire range, we should succeed in moving the + * first VMA, but no others, and report a failure. + */ + res = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, tgt_ptr); + err = errno; + if (res != MAP_FAILED) { + fprintf(stderr, "mremap() succeeded for multi VMA uffd armed\n"); + success = false; + goto out_unmap; + } + if (err != EFAULT) { + errno = err; + perror("mrmeap() unexpected error"); + success = false; + goto out_unmap; + } + if (!is_ptr_mapped(maps_fp, tgt_ptr, page_size)) { + fprintf(stderr, "Valid VMA not moved\n"); + success = false; + goto out_unmap; + } + + /* + * Unmap the VMA, and map valid VMA at start of ptr range, and replace + * all existing multi-move invalid VMAs, except the last, with valid + * multi-move VMAs. + */ + if (munmap(tgt_ptr, page_size)) { + perror("munmap"); + success = false; + goto out_unmap; + } + if (munmap(ptr, size - 2 * page_size)) { + perror("munmap"); + success = false; + goto out_unmap; + } + for (i = 0; i < 8; i += 2) { + res = mmap(&ptr[i * page_size], page_size, + PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANON | MAP_FIXED, -1, 0); + if (res == MAP_FAILED) { + perror("mmap"); + success = false; + goto out_unmap; + } + } + + /* + * Now try to move the entire range, we should succeed in moving all but + * the last VMA, and report a failure. + */ + res = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, tgt_ptr); + err = errno; + if (res != MAP_FAILED) { + fprintf(stderr, "mremap() succeeded for multi VMA uffd armed\n"); + success = false; + goto out_unmap; + } + if (err != EFAULT) { + errno = err; + perror("mrmeap() unexpected error"); + success = false; + goto out_unmap; + } + + for (i = 0; i < 10; i += 2) { + bool is_mapped = is_ptr_mapped(maps_fp, + &tgt_ptr[i * page_size], page_size); + + if (i < 8 && !is_mapped) { + fprintf(stderr, "Valid VMA not moved at %d\n", i); + success = false; + goto out_unmap; + } else if (i == 8 && is_mapped) { + fprintf(stderr, "Invalid VMA moved at %d\n", i); + success = false; + goto out_unmap; + } + } + +out_unmap: + if (munmap(tgt_ptr, size)) + perror("munmap tgt"); + if (munmap(ptr, size)) + perror("munmap src"); +out_close_uffd: + close(uffd); +out: + if (success) + ksft_test_result_pass("%s\n", test_name); + else + ksft_test_result_fail("%s\n", test_name); +} +#else +static void mremap_move_multi_invalid_vmas(FILE *maps_fp, unsigned long page_size) +{ + char *test_name = "mremap move multiple invalid vmas"; + + ksft_test_result_skip("%s - missing uffd", test_name); +} +#endif /* __NR_userfaultfd */ + /* Returns the time taken for the remap on success else returns -1. */ static long long remap_region(struct config c, unsigned int threshold_mb, char *rand_addr) @@ -1074,7 +1331,7 @@ int main(int argc, char **argv) char *rand_addr; size_t rand_size; int num_expand_tests = 2; - int num_misc_tests = 8; + int num_misc_tests = 9; struct test test_cases[MAX_TEST] = {}; struct test perf_test_cases[MAX_PERF_TEST]; int page_size; @@ -1197,8 +1454,6 @@ int main(int argc, char **argv) mremap_expand_merge(maps_fp, page_size); mremap_expand_merge_offset(maps_fp, page_size); - fclose(maps_fp); - mremap_move_within_range(pattern_seed, rand_addr); mremap_move_1mb_from_start(pattern_seed, rand_addr); mremap_shrink_multiple_vmas(page_size, /* inplace= */true); @@ -1207,6 +1462,9 @@ int main(int argc, char **argv) mremap_move_multiple_vmas(pattern_seed, page_size, /* dontunmap= */ true); mremap_move_multiple_vmas_split(pattern_seed, page_size, /* dontunmap= */ false); mremap_move_multiple_vmas_split(pattern_seed, page_size, /* dontunmap= */ true); + mremap_move_multi_invalid_vmas(maps_fp, page_size); + + fclose(maps_fp); if (run_perf_tests) { ksft_print_msg("\n%s\n", -- cgit v1.2.3 From 0cc2a4880ced1486acc34898cd85edc6ee109c4c Mon Sep 17 00:00:00 2001 From: Sang-Heon Jeon Date: Tue, 12 Aug 2025 23:00:46 +0900 Subject: selftests/damon: fix selftests by installing drgn related script drgn_dump_damon_status is not installed during kselftest setup. It can break other tests which depend on drgn_dump_damon_status. Install drgn_dump_damon_status files to fix broken test. Link: https://lkml.kernel.org/r/20250812140046.660486-1-ekffu200098@gmail.com Fixes: f3e8e1e51362 ("selftests/damon: add drgn script for extracting damon status") Signed-off-by: Sang-Heon Jeon Reviewed-by: SeongJae Park Cc: Alexandre Ghiti Cc: Honggyu Kim Signed-off-by: Andrew Morton --- tools/testing/selftests/damon/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'tools/testing') diff --git a/tools/testing/selftests/damon/Makefile b/tools/testing/selftests/damon/Makefile index 5b230deb19e8..9a3499827d4b 100644 --- a/tools/testing/selftests/damon/Makefile +++ b/tools/testing/selftests/damon/Makefile @@ -4,6 +4,7 @@ TEST_GEN_FILES += access_memory access_memory_even TEST_FILES = _damon_sysfs.py +TEST_FILES += drgn_dump_damon_status.py # functionality tests TEST_PROGS += sysfs.sh -- cgit v1.2.3