6.6-stable review patch. If anyone has any objections, please let me know.
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From: Lorenzo Stoakes lorenzo.stoakes@oracle.com
commit 084d2ac4030c5919e85bba1f4af26e33491469cb upstream.
Exercise various mmap(), munmap() and mremap() invocations, which might cause a perf buffer mapping to be split or truncated.
To avoid hard coding the perf event and having dependencies on architectures and configuration options, scan through event types in sysfs and try to open them. On success, try to mmap() and if that succeeds try to mmap() the AUX buffer.
In case that no AUX buffer supporting event is found, only test the base buffer mapping. If no mappable event is found or permissions are not sufficient, skip the tests.
Reserve a PROT_NONE region for both rb and aux tests to allow testing the case where mremap unmaps beyond the end of a mapped VMA to prevent it from unmapping unrelated mappings.
Signed-off-by: Lorenzo Stoakes lorenzo.stoakes@oracle.com Co-developed-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: Thomas Gleixner tglx@linutronix.de Reviewed-by: Lorenzo Stoakes lorenzo.stoakes@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/testing/selftests/perf_events/.gitignore | 1 tools/testing/selftests/perf_events/Makefile | 2 tools/testing/selftests/perf_events/mmap.c | 236 +++++++++++++++++++++++++ 3 files changed, 238 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/perf_events/mmap.c
--- a/tools/testing/selftests/perf_events/.gitignore +++ b/tools/testing/selftests/perf_events/.gitignore @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only sigtrap_threads remove_on_exec +mmap --- a/tools/testing/selftests/perf_events/Makefile +++ b/tools/testing/selftests/perf_events/Makefile @@ -2,5 +2,5 @@ CFLAGS += -Wl,-no-as-needed -Wall $(KHDR_INCLUDES) LDFLAGS += -lpthread
-TEST_GEN_PROGS := sigtrap_threads remove_on_exec +TEST_GEN_PROGS := sigtrap_threads remove_on_exec mmap include ../lib.mk --- /dev/null +++ b/tools/testing/selftests/perf_events/mmap.c @@ -0,0 +1,236 @@ +// SPDX-License-Identifier: GPL-2.0-only +#define _GNU_SOURCE + +#include <dirent.h> +#include <sched.h> +#include <stdbool.h> +#include <stdio.h> +#include <unistd.h> + +#include <sys/ioctl.h> +#include <sys/mman.h> +#include <sys/syscall.h> +#include <sys/types.h> + +#include <linux/perf_event.h> + +#include "../kselftest_harness.h" + +#define RB_SIZE 0x3000 +#define AUX_SIZE 0x10000 +#define AUX_OFFS 0x4000 + +#define HOLE_SIZE 0x1000 + +/* Reserve space for rb, aux with space for shrink-beyond-vma testing. */ +#define REGION_SIZE (2 * RB_SIZE + 2 * AUX_SIZE) +#define REGION_AUX_OFFS (2 * RB_SIZE) + +#define MAP_BASE 1 +#define MAP_AUX 2 + +#define EVENT_SRC_DIR "/sys/bus/event_source/devices" + +FIXTURE(perf_mmap) +{ + int fd; + void *ptr; + void *region; +}; + +FIXTURE_VARIANT(perf_mmap) +{ + bool aux; + unsigned long ptr_size; +}; + +FIXTURE_VARIANT_ADD(perf_mmap, rb) +{ + .aux = false, + .ptr_size = RB_SIZE, +}; + +FIXTURE_VARIANT_ADD(perf_mmap, aux) +{ + .aux = true, + .ptr_size = AUX_SIZE, +}; + +static bool read_event_type(struct dirent *dent, __u32 *type) +{ + char typefn[512]; + FILE *fp; + int res; + + snprintf(typefn, sizeof(typefn), "%s/%s/type", EVENT_SRC_DIR, dent->d_name); + fp = fopen(typefn, "r"); + if (!fp) + return false; + + res = fscanf(fp, "%u", type); + fclose(fp); + return res > 0; +} + +FIXTURE_SETUP(perf_mmap) +{ + struct perf_event_attr attr = { + .size = sizeof(attr), + .disabled = 1, + .exclude_kernel = 1, + .exclude_hv = 1, + }; + struct perf_event_attr attr_ok = {}; + unsigned int eacces = 0, map = 0; + struct perf_event_mmap_page *rb; + struct dirent *dent; + void *aux, *region; + DIR *dir; + + self->ptr = NULL; + + dir = opendir(EVENT_SRC_DIR); + if (!dir) + SKIP(return, "perf not available."); + + region = mmap(NULL, REGION_SIZE, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0); + ASSERT_NE(region, MAP_FAILED); + self->region = region; + + // Try to find a suitable event on this system + while ((dent = readdir(dir))) { + int fd; + + if (!read_event_type(dent, &attr.type)) + continue; + + fd = syscall(SYS_perf_event_open, &attr, 0, -1, -1, 0); + if (fd < 0) { + if (errno == EACCES) + eacces++; + continue; + } + + // Check whether the event supports mmap() + rb = mmap(region, RB_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, fd, 0); + if (rb == MAP_FAILED) { + close(fd); + continue; + } + + if (!map) { + // Save the event in case that no AUX capable event is found + attr_ok = attr; + map = MAP_BASE; + } + + if (!variant->aux) + continue; + + rb->aux_offset = AUX_OFFS; + rb->aux_size = AUX_SIZE; + + // Check whether it supports a AUX buffer + aux = mmap(region + REGION_AUX_OFFS, AUX_SIZE, PROT_READ | PROT_WRITE, + MAP_SHARED | MAP_FIXED, fd, AUX_OFFS); + if (aux == MAP_FAILED) { + munmap(rb, RB_SIZE); + close(fd); + continue; + } + + attr_ok = attr; + map = MAP_AUX; + munmap(aux, AUX_SIZE); + munmap(rb, RB_SIZE); + close(fd); + break; + } + closedir(dir); + + if (!map) { + if (!eacces) + SKIP(return, "No mappable perf event found."); + else + SKIP(return, "No permissions for perf_event_open()"); + } + + self->fd = syscall(SYS_perf_event_open, &attr_ok, 0, -1, -1, 0); + ASSERT_NE(self->fd, -1); + + rb = mmap(region, RB_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, self->fd, 0); + ASSERT_NE(rb, MAP_FAILED); + + if (!variant->aux) { + self->ptr = rb; + return; + } + + if (map != MAP_AUX) + SKIP(return, "No AUX event found."); + + rb->aux_offset = AUX_OFFS; + rb->aux_size = AUX_SIZE; + aux = mmap(region + REGION_AUX_OFFS, AUX_SIZE, PROT_READ | PROT_WRITE, + MAP_SHARED | MAP_FIXED, self->fd, AUX_OFFS); + ASSERT_NE(aux, MAP_FAILED); + self->ptr = aux; +} + +FIXTURE_TEARDOWN(perf_mmap) +{ + ASSERT_EQ(munmap(self->region, REGION_SIZE), 0); + if (self->fd != -1) + ASSERT_EQ(close(self->fd), 0); +} + +TEST_F(perf_mmap, remap) +{ + void *tmp, *ptr = self->ptr; + unsigned long size = variant->ptr_size; + + // Test the invalid remaps + ASSERT_EQ(mremap(ptr, size, HOLE_SIZE, MREMAP_MAYMOVE), MAP_FAILED); + ASSERT_EQ(mremap(ptr + HOLE_SIZE, size, HOLE_SIZE, MREMAP_MAYMOVE), MAP_FAILED); + ASSERT_EQ(mremap(ptr + size - HOLE_SIZE, HOLE_SIZE, size, MREMAP_MAYMOVE), MAP_FAILED); + // Shrink the end of the mapping such that we only unmap past end of the VMA, + // which should succeed and poke a hole into the PROT_NONE region + ASSERT_NE(mremap(ptr + size - HOLE_SIZE, size, HOLE_SIZE, MREMAP_MAYMOVE), MAP_FAILED); + + // Remap the whole buffer to a new address + tmp = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0); + ASSERT_NE(tmp, MAP_FAILED); + + // Try splitting offset 1 hole size into VMA, this should fail + ASSERT_EQ(mremap(ptr + HOLE_SIZE, size - HOLE_SIZE, size - HOLE_SIZE, + MREMAP_MAYMOVE | MREMAP_FIXED, tmp), MAP_FAILED); + // Remapping the whole thing should succeed fine + ptr = mremap(ptr, size, size, MREMAP_MAYMOVE | MREMAP_FIXED, tmp); + ASSERT_EQ(ptr, tmp); + ASSERT_EQ(munmap(tmp, size), 0); +} + +TEST_F(perf_mmap, unmap) +{ + unsigned long size = variant->ptr_size; + + // Try to poke holes into the mappings + ASSERT_NE(munmap(self->ptr, HOLE_SIZE), 0); + ASSERT_NE(munmap(self->ptr + HOLE_SIZE, HOLE_SIZE), 0); + ASSERT_NE(munmap(self->ptr + size - HOLE_SIZE, HOLE_SIZE), 0); +} + +TEST_F(perf_mmap, map) +{ + unsigned long size = variant->ptr_size; + + // Try to poke holes into the mappings by mapping anonymous memory over it + ASSERT_EQ(mmap(self->ptr, HOLE_SIZE, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANON | MAP_FIXED, -1, 0), MAP_FAILED); + ASSERT_EQ(mmap(self->ptr + HOLE_SIZE, HOLE_SIZE, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANON | MAP_FIXED, -1, 0), MAP_FAILED); + ASSERT_EQ(mmap(self->ptr + size - HOLE_SIZE, HOLE_SIZE, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANON | MAP_FIXED, -1, 0), MAP_FAILED); +} + +TEST_HARNESS_MAIN