WARNING: line length of 81 exceeds 80 columns
#89: FILE: kernel/bpf/syscall.c:2855:
+		err = bpf_verify_pkcs7_signature((struct bpf_dynptr *)&insns_ptr,

WARNING: line length of 85 exceeds 80 columns
#90: FILE: kernel/bpf/syscall.c:2856:
+						 (struct bpf_dynptr *)&sig_ptr, key);

WARNING: line length of 89 exceeds 80 columns
#95: FILE: kernel/bpf/syscall.c:2861:
+		maps = kvmemdup_bpfptr(umaps, attr->signature_maps_size * sizeof(*maps));

WARNING: line length of 82 exceeds 80 columns
#100: FILE: kernel/bpf/syscall.c:2866:
+		/* Process the map array in reverse order to generate a hash chain

WARNING: line length of 93 exceeds 80 columns
#106: FILE: kernel/bpf/syscall.c:2872:
+						      make_bpfptr(attr->fd_array, is_kernel),

CHECK: braces {} should be used on all arms of this statement
#112: FILE: kernel/bpf/syscall.c:2878:
+			if (n == attr->signature_maps_size - 1)
[...]
+			else {
[...]

CHECK: Unbalanced braces around else statement
#114: FILE: kernel/bpf/syscall.c:2880:
+			else {

WARNING: line length of 90 exceeds 80 columns
#116: FILE: kernel/bpf/syscall.c:2882:
+				err = bpf_map_get_hash(map_fd, buffer + ARRAY_SIZE(hash));

WARNING: line length of 82 exceeds 80 columns
#117: FILE: kernel/bpf/syscall.c:2883:
+				sha256((u8 *)buffer, sizeof(buffer), (u8 *)&hash);

WARNING: line length of 95 exceeds 80 columns
#125: FILE: kernel/bpf/syscall.c:2891:
+		sha256((u8 *)prog->insnsi, prog->len * sizeof(struct bpf_insn), (u8 *)&buffer);

WARNING: line length of 85 exceeds 80 columns
#129: FILE: kernel/bpf/syscall.c:2895:
+						 (struct bpf_dynptr *)&sig_ptr, key);

WARNING: The commit message has 'syzkaller', perhaps it also needs a 'Fixes:' tag?

total: 0 errors, 10 warnings, 2 checks, 123 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 8f6b4f42afef ("bpf: Add hash chain signature support for arbitrary maps") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 10 warnings, 2 checks, 123 lines checked