diff mbox series

[RFC,v2,bpf-next,2/9] bpf: Use file's inode object build id in stackmap

Message ID 20230228093206.821563-3-jolsa@kernel.org (mailing list archive)
State RFC
Delegated to: BPF
Headers show
Series mm/bpf/perf: Store build id in inode object | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR success PR summary
bpf/vmtest-bpf-next-VM_Test-1 success Logs for ${{ matrix.test }} on ${{ matrix.arch }} with ${{ matrix.toolchain }}
bpf/vmtest-bpf-next-VM_Test-2 success Logs for ShellCheck
bpf/vmtest-bpf-next-VM_Test-3 fail Logs for build for aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-4 fail Logs for build for aarch64 with llvm-17
bpf/vmtest-bpf-next-VM_Test-5 fail Logs for build for s390x with gcc
bpf/vmtest-bpf-next-VM_Test-6 fail Logs for build for x86_64 with gcc
bpf/vmtest-bpf-next-VM_Test-7 fail Logs for build for x86_64 with llvm-17
bpf/vmtest-bpf-next-VM_Test-8 success Logs for llvm-toolchain
bpf/vmtest-bpf-next-VM_Test-9 success Logs for set-matrix
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for bpf-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 2 this patch: 2
netdev/cc_maintainers warning 3 maintainers not CCed: kpsingh@kernel.org song@kernel.org martin.lau@linux.dev
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 2 this patch: 2
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 36 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Jiri Olsa Feb. 28, 2023, 9:31 a.m. UTC 
Use build id from file's inode object in stackmap if it's available.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 kernel/bpf/stackmap.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/bpf/stackmap.c b/kernel/bpf/stackmap.c
index aecea7451b61..9b9578e0cada 100644
--- a/kernel/bpf/stackmap.c
+++ b/kernel/bpf/stackmap.c
@@ -124,6 +124,28 @@  static struct bpf_map *stack_map_alloc(union bpf_attr *attr)
 	return ERR_PTR(err);
 }
 
+#ifdef CONFIG_INODE_BUILD_ID
+static int vma_get_build_id(struct vm_area_struct *vma, unsigned char *build_id)
+{
+	struct build_id *bid;
+
+	if (!vma->vm_file)
+		return -EINVAL;
+	bid = file_inode(vma->vm_file)->i_build_id;
+	if (IS_ERR_OR_NULL(bid))
+		return bid ? PTR_ERR(bid) : -ENOENT;
+	if (bid->sz > BUILD_ID_SIZE_MAX)
+		return -EINVAL;
+	memcpy(build_id, bid->data, bid->sz);
+	return 0;
+}
+#else
+static int vma_get_build_id(struct vm_area_struct *vma, unsigned char *build_id)
+{
+	return build_id_parse(vma, build_id, NULL);
+}
+#endif
+
 static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
 					  u64 *ips, u32 trace_nr, bool user)
 {
@@ -156,7 +178,7 @@  static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
 			goto build_id_valid;
 		}
 		vma = find_vma(current->mm, ips[i]);
-		if (!vma || build_id_parse(vma, id_offs[i].build_id, NULL)) {
+		if (!vma || vma_get_build_id(vma, id_offs[i].build_id)) {
 			/* per entry fall back to ips */
 			id_offs[i].status = BPF_STACK_BUILD_ID_IP;
 			id_offs[i].ip = ips[i];