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Assert that we can perform a vector operation of an operation that would not be permitted on a remote mm (MADV_DONTNEED in this instance) on ones in our own mm and that the operation is correctly peformed. Signed-off-by: Lorenzo Stoakes --- tools/testing/selftests/mm/.gitignore | 1 + tools/testing/selftests/mm/Makefile | 1 + tools/testing/selftests/mm/process_madvise.c | 115 +++++++++++++++++++ 3 files changed, 117 insertions(+) create mode 100644 tools/testing/selftests/mm/process_madvise.c diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selftests/mm/.gitignore index da030b43e43b..a875376601b7 100644 --- a/tools/testing/selftests/mm/.gitignore +++ b/tools/testing/selftests/mm/.gitignore @@ -51,3 +51,4 @@ hugetlb_madv_vs_map mseal_test seal_elf droppable +process_madvise diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile index 02e1204971b0..7503ec177cd2 100644 --- a/tools/testing/selftests/mm/Makefile +++ b/tools/testing/selftests/mm/Makefile @@ -79,6 +79,7 @@ TEST_GEN_FILES += hugetlb_fault_after_madv TEST_GEN_FILES += hugetlb_madv_vs_map TEST_GEN_FILES += hugetlb_dio TEST_GEN_FILES += droppable +TEST_GEN_FILES += process_madvise ifneq ($(ARCH),arm64) TEST_GEN_FILES += soft-dirty diff --git a/tools/testing/selftests/mm/process_madvise.c b/tools/testing/selftests/mm/process_madvise.c new file mode 100644 index 000000000000..7a29b77d837d --- /dev/null +++ b/tools/testing/selftests/mm/process_madvise.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#define _GNU_SOURCE +#include "../kselftest_harness.h" +#include +#include +#include +#include +#include + +/* May not be available in host system yet. */ +#ifndef PR_MADV_SELF +#define PR_MADV_SELF (1<<0) +#endif + +FIXTURE(process_madvise) +{ + unsigned long page_size; +}; + +FIXTURE_SETUP(process_madvise) +{ + self->page_size = (unsigned long)sysconf(_SC_PAGESIZE); +}; + +FIXTURE_TEARDOWN(process_madvise) +{ +} + +static void populate_range(char *ptr, size_t len) +{ + memset(ptr, 'x', len); +} + +static bool is_range_zeroed(char *ptr, size_t len) +{ + size_t i; + + for (i = 0; i < len; i++) { + if (ptr[i] != '\0') + return false; + } + + return true; +} + +TEST_F(process_madvise, pr_madv_self) +{ + const unsigned long page_size = self->page_size; + struct iovec vec[3]; + char *ptr_region, *ptr, *ptr2, *ptr3; + + /* Establish a region in which to place VMAs. */ + ptr_region = mmap(NULL, 100 * page_size, PROT_NONE, + MAP_PRIVATE | MAP_ANON, -1, 0); + ASSERT_NE(ptr_region, MAP_FAILED); + + /* Place a 5 page mapping offset by one page into the region. */ + ptr = mmap(&ptr_region[page_size], 5 * page_size, + PROT_READ | PROT_WRITE, + MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0); + ASSERT_NE(ptr, MAP_FAILED); + populate_range(ptr, 5 * page_size); + vec[0].iov_base = ptr; + vec[0].iov_len = 5 * page_size; + /* Free the PROT_NONE region before this region. */ + ASSERT_EQ(munmap(ptr_region, page_size), 0); + + /* Place a 10 page mapping in the middle of the region. */ + ptr2 = mmap(&ptr_region[50 * page_size], 10 * page_size, + PROT_READ | PROT_WRITE, + MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0); + ASSERT_NE(ptr2, MAP_FAILED); + populate_range(ptr2, 10 * page_size); + vec[1].iov_base = ptr2; + vec[1].iov_len = 10 * page_size; + /* Free the PROT_NONE region before this region. */ + ASSERT_EQ(munmap(&ptr_region[6 * page_size], 44 * page_size), 0); + + /* Place a 3 page mapping at the end of the region, offset by 1. */ + ptr3 = mmap(&ptr_region[96 * page_size], 3 * page_size, + PROT_READ | PROT_WRITE, + MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0); + ASSERT_NE(ptr3, MAP_FAILED); + populate_range(ptr3, 3 * page_size); + vec[2].iov_base = ptr3; + vec[2].iov_len = 3 * page_size; + /* Free the PROT_NONE region before this region. */ + ASSERT_EQ(munmap(&ptr_region[60 * page_size], 36 * page_size), 0); + /* Free the PROT_NONE region after this region. */ + ASSERT_EQ(munmap(&ptr_region[99 * page_size], page_size), 0); + + /* + * OK now we should have three distinct regions of memory. Zap + * them with MADV_DONTNEED. This should clear the populated ranges and + * we can then assert on them being zeroed. + * + * The function returns the number of bytes advised, so assert this is + * equal to the total size of the three regions. + */ + ASSERT_EQ(process_madvise(0, vec, 3, MADV_DONTNEED, PR_MADV_SELF), + (5 + 10 + 3) * page_size); + + /* Make sure these ranges are now zeroed. */ + ASSERT_TRUE(is_range_zeroed(ptr, 5 * page_size)); + ASSERT_TRUE(is_range_zeroed(ptr2, 10 * page_size)); + ASSERT_TRUE(is_range_zeroed(ptr2, 3 * page_size)); + + /* Cleanup. */ + ASSERT_EQ(munmap(ptr, 5 * page_size), 0); + ASSERT_EQ(munmap(ptr2, 10 * page_size), 0); + ASSERT_EQ(munmap(ptr3, 3 * page_size), 0); +} + +TEST_HARNESS_MAIN