[PATCH 4/5] selftests/bpf: make use of PROCFS_PROCMAP_QUERY ioctl, if available

[Andrii Nakryiko <andrii@kernel.org>]

Instead of parsing text-based /proc/<pid>/maps file, try to use
PROCFS_PROCMAP_QUERY ioctl() to simplify and speed up data fetching.
This logic is used to do uprobe file offset calculation, so any bugs in
this logic would manifest as failing uprobe BPF selftests.

This also serves as a simple demonstration of one of the intended uses.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
 tools/testing/selftests/bpf/test_progs.c    |   3 +
 tools/testing/selftests/bpf/test_progs.h    |   2 +
 tools/testing/selftests/bpf/trace_helpers.c | 105 +++++++++++++++++---
 3 files changed, 95 insertions(+), 15 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
index 89ff704e9dad..6a19970f2531 100644
--- a/tools/testing/selftests/bpf/test_progs.c
+++ b/tools/testing/selftests/bpf/test_progs.c
@@ -19,6 +19,8 @@
 #include <bpf/btf.h>
 #include "json_writer.h"
 
+int env_verbosity = 0;
+
 static bool verbose(void)
 {
 	return env.verbosity > VERBOSE_NONE;
@@ -848,6 +850,7 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state)
 				return -EINVAL;
 			}
 		}
+		env_verbosity = env->verbosity;
 
 		if (verbose()) {
 			if (setenv("SELFTESTS_VERBOSE", "1", 1) == -1) {
diff --git a/tools/testing/selftests/bpf/test_progs.h b/tools/testing/selftests/bpf/test_progs.h
index 0ba5a20b19ba..6eae7fdab0d7 100644
--- a/tools/testing/selftests/bpf/test_progs.h
+++ b/tools/testing/selftests/bpf/test_progs.h
@@ -95,6 +95,8 @@ struct test_state {
 	FILE *stdout;
 };
 
+extern int env_verbosity;
+
 struct test_env {
 	struct test_selector test_selector;
 	struct test_selector subtest_selector;
diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c
index 70e29f316fe7..8ac71e73d173 100644
--- a/tools/testing/selftests/bpf/trace_helpers.c
+++ b/tools/testing/selftests/bpf/trace_helpers.c
@@ -10,6 +10,8 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <linux/perf_event.h>
+#include <linux/fs.h>
+#include <sys/ioctl.h>
 #include <sys/mman.h>
 #include "trace_helpers.h"
 #include <linux/limits.h>
@@ -233,29 +235,92 @@ int kallsyms_find(const char *sym, unsigned long long *addr)
 	return err;
 }
 
+#ifdef PROCFS_PROCMAP_QUERY
+int env_verbosity __weak = 0;
+
+int procmap_query(int fd, const void *addr, size_t *start, size_t *offset, int *flags)
+{
+	char path_buf[PATH_MAX], build_id_buf[20];
+	struct procfs_procmap_query q;
+	int err;
+
+	memset(&q, 0, sizeof(q));
+	q.size = sizeof(q);
+	q.query_addr = (__u64)addr;
+	q.vma_name_addr = (__u64)path_buf;
+	q.vma_name_size = sizeof(path_buf);
+	q.build_id_addr = (__u64)build_id_buf;
+	q.build_id_size = sizeof(build_id_buf);
+
+	err = ioctl(fd, PROCFS_PROCMAP_QUERY, &q);
+	if (err < 0) {
+		err = -errno;
+		if (err == -ENOTTY)
+			return -EOPNOTSUPP; /* ioctl() not implemented yet */
+		if (err == -ENOENT)
+			return -ESRCH; /* vma not found */
+		return err;
+	}
+
+	if (env_verbosity >= 1) {
+		printf("VMA FOUND (addr %08lx): %08lx-%08lx %c%c%c%c %08lx %02x:%02x %ld %s (build ID: %s, %d bytes)\n",
+		       (long)addr, (long)q.vma_start, (long)q.vma_end,
+		       (q.vma_flags & PROCFS_PROCMAP_VMA_READABLE) ? 'r' : '-',
+		       (q.vma_flags & PROCFS_PROCMAP_VMA_WRITABLE) ? 'w' : '-',
+		       (q.vma_flags & PROCFS_PROCMAP_VMA_EXECUTABLE) ? 'x' : '-',
+		       (q.vma_flags & PROCFS_PROCMAP_VMA_SHARED) ? 's' : 'p',
+		       (long)q.vma_offset, q.dev_major, q.dev_minor, (long)q.inode,
+		       q.vma_name_size ? path_buf : "",
+		       q.build_id_size ? "YES" : "NO",
+		       q.build_id_size);
+	}
+
+	*start = q.vma_start;
+	*offset = q.vma_offset;
+	*flags = q.vma_flags;
+	return 0;
+}
+#else
+int procmap_query(int fd, const void *addr, size_t *start, size_t *offset, int *flags)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
 ssize_t get_uprobe_offset(const void *addr)
 {
-	size_t start, end, base;
-	char buf[256];
-	bool found = false;
+	size_t start, base, end;
 	FILE *f;
+	char buf[256];
+	int err, flags;
 
 	f = fopen("/proc/self/maps", "r");
 	if (!f)
 		return -errno;
 
-	while (fscanf(f, "%zx-%zx %s %zx %*[^\n]\n", &start, &end, buf, &base) == 4) {
-		if (buf[2] == 'x' && (uintptr_t)addr >= start && (uintptr_t)addr < end) {
-			found = true;
-			break;
+	err = procmap_query(fileno(f), addr, &start, &base, &flags);
+	if (err == 0) {
+		if (!(flags & PROCFS_PROCMAP_VMA_EXECUTABLE))
+			return -ESRCH;
+	} else if (err != -EOPNOTSUPP) {
+		fclose(f);
+		return err;
+	} else if (err) {
+		bool found = false;
+
+		while (fscanf(f, "%zx-%zx %s %zx %*[^\n]\n", &start, &end, buf, &base) == 4) {
+			if (buf[2] == 'x' && (uintptr_t)addr >= start && (uintptr_t)addr < end) {
+				found = true;
+				break;
+			}
+		}
+		if (!found) {
+			fclose(f);
+			return -ESRCH;
 		}
 	}
-
 	fclose(f);
 
-	if (!found)
-		return -ESRCH;
-
 #if defined(__powerpc64__) && defined(_CALL_ELF) && _CALL_ELF == 2
 
 #define OP_RT_RA_MASK   0xffff0000UL
@@ -296,15 +361,25 @@ ssize_t get_rel_offset(uintptr_t addr)
 	size_t start, end, offset;
 	char buf[256];
 	FILE *f;
+	int err, flags;
 
 	f = fopen("/proc/self/maps", "r");
 	if (!f)
 		return -errno;
 
-	while (fscanf(f, "%zx-%zx %s %zx %*[^\n]\n", &start, &end, buf, &offset) == 4) {
-		if (addr >= start && addr < end) {
-			fclose(f);
-			return (size_t)addr - start + offset;
+	err = procmap_query(fileno(f), (const void *)addr, &start, &offset, &flags);
+	if (err == 0) {
+		fclose(f);
+		return (size_t)addr - start + offset;
+	} else if (err != -EOPNOTSUPP) {
+		fclose(f);
+		return err;
+	} else if (err) {
+		while (fscanf(f, "%zx-%zx %s %zx %*[^\n]\n", &start, &end, buf, &offset) == 4) {
+			if (addr >= start && addr < end) {
+				fclose(f);
+				return (size_t)addr - start + offset;
+			}
 		}
 	}
 
-- 
2.43.0