selftests/bpf: make use of PROCMAP_QUERY ioctl if available

Instead of parsing text-based /proc/<pid>/maps file, try to use
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 <[e-mail]>
Acked-by: Jiri Olsa <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Alexei Starovoitov <[e-mail]>

tools/testing/selftests/bpf/test_progs.c

···
 	dprintf(fd, "<backtrace not supported>\n");
 }
 
+int env_verbosity = 0;
+
 static bool verbose(void)
 {
 	return env.verbosity > VERBOSE_NONE;
···
 				return -EINVAL;
 			}
 		}
+		env_verbosity = env->verbosity;
 
 		if (verbose()) {
 			if (setenv("SELFTESTS_VERBOSE", "1", 1) == -1) {

tools/testing/selftests/bpf/test_progs.h

···
 	FILE *stdout_saved;
 };
 
+extern int env_verbosity;
+
 struct test_env {
 	struct test_selector test_selector;
 	struct test_selector subtest_selector;

tools/testing/selftests/bpf/trace_helpers.c

···
 #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>
···
 	return err;
 }
 
+#ifdef PROCMAP_QUERY
+int env_verbosity __weak = 0;
+
+int procmap_query(int fd, const void *addr, __u32 query_flags, size_t *start, size_t *offset, int *flags)
+{
+	char path_buf[PATH_MAX], build_id_buf[20];
+	struct procmap_query q;
+	int err;
+
+	memset(&q, 0, sizeof(q));
+	q.size = sizeof(q);
+	q.query_flags = query_flags;
+	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, 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 & PROCMAP_QUERY_VMA_READABLE) ? 'r' : '-',
+		       (q.vma_flags & PROCMAP_QUERY_VMA_WRITABLE) ? 'w' : '-',
+		       (q.vma_flags & PROCMAP_QUERY_VMA_EXECUTABLE) ? 'x' : '-',
+		       (q.vma_flags & PROCMAP_QUERY_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;
+	/* requested executable VMA only */
+	err = procmap_query(fileno(f), addr, PROCMAP_QUERY_VMA_EXECUTABLE, &start, &base, &flags);
+	if (err == -EOPNOTSUPP) {
+		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;
+		}
+	} else if (err) {
+		fclose(f);
+		return err;
 	}
-
 	fclose(f);
-
-	if (!found)
-		return -ESRCH;
 
 #if defined(__powerpc64__) && defined(_CALL_ELF) && _CALL_ELF == 2
 
···
 	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, 0, &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;
+			}
 		}
 	}