Commit 1e5c00912695 for kernel

commit 1e5c009126952f673ffa2427acbd69e57493f0d2
Author: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Date:   Wed Feb 18 13:01:44 2026 +0100

    selftests/bpf: Remove hexdump dependency

    The verification signature header generation requires converting a
    binary certificate to a C array. Previously this only worked with xxd,
    and a switch to hexdump has been done in commit b640d556a2b3
    ("selftests/bpf: Remove xxd util dependency").

    hexdump is a more common utility program, yet it might not be installed
    by default. When it is not installed, BPF selftests build without
    errors, but tests_progs is unusable: it exits with the 255 code and
    without any error messages. When manually reproducing the issue, it is
    not too hard to find out that the generated verification_cert.h file is
    incorrect, but that's time consuming. When digging the BPF selftests
    build logs, this line can be seen amongst thousands others, but ignored:

      /bin/sh: 2: hexdump: not found

    Here, od is used instead of hexdump. od is coming from the coreutils
    package, and this new od command produces the same output when using od
    from GNU coreutils, uutils, and even busybox. This is more portable, and
    it produces a similar results to what was done before with hexdump:
    there is an extra comma at the end instead of trailing whitespaces,
    but the C code is not impacted.

    Fixes: b640d556a2b3 ("selftests/bpf: Remove xxd util dependency")
    Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
    Tested-by: Alan Maguire <alan.maguire@oracle.com>
    Link: https://lore.kernel.org/r/20260218-bpf-sft-hexdump-od-v2-1-2f9b3ee5ab86@kernel.org
    Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index c6bf4dfb1495..6776158f1f3e 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -723,7 +723,7 @@ $(VERIFICATION_CERT) $(PRIVATE_KEY): $(VERIFY_SIG_SETUP)
 # Generates a header with C array declaration, containing test_progs_verification_cert bytes
 $(VERIFY_SIG_HDR): $(VERIFICATION_CERT)
 	$(Q)(echo "unsigned char test_progs_verification_cert[] = {"; \
-	 hexdump -v -e '12/1 "  0x%02x," "\n"' $< | sed 's/0x  ,//g; $$s/,$$//'; \
+	 od -v -t 'xC' -w12 $< | sed 's/ \(\S\+\)/ 0x\1,/g;s/^\S\+/ /;$$d'; \
 	 echo "};"; \
 	 echo "unsigned int test_progs_verification_cert_len = $$(wc -c < $<);") > $@