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Yihan Ding says: ==================== bpf: allow UTF-8 literals in bpf_bprintf_prepare() bpf_bprintf_prepare() currently rejects any non-ASCII byte in format strings, so helpers such as bpf_trace_printk() fail to emit UTF-8 literal text even when those bytes are not part of a format specifier. Keep plain text permissive while continuing to parse '%' sequences as ASCII-only. Patch 1 updates snprintf_negative() at the same time so the selftests stay consistent during bisection. Patch 2 then extends trace_printk coverage for both the valid UTF-8 literal case and the invalid non-ASCII-after-'%' case. Changes in v3: - drop Suggested-by trailers and move review credit into this changelog - update test_snprintf_negative() in patch 1/2 so plain non-ASCII text is accepted while non-ASCII after '%' is still rejected, keeping ./test_progs -t snprintf aligned with the new behavior. - clarify the trace_printk negative case with an explicit invalid format string and comment - address Paul Chaignon's review feedback and keep the negative coverage requested earlier by Alan Maguire Changes in v2: - split the core change and selftest updates into two patches - drop unnecessary isspace()/ispunct() casts - add comments to clarify plain-text vs format-specifier handling - add a negative selftest for non-ASCII bytes inside '%' sequences Testing: - Reproduced on x86_64 without the core fix: ASCII trace output works, while UTF-8 literal text in bpf_trace_printk() is rejected and produces no trace output - Verified with tools/testing/selftests/bpf: ./test_progs -t trace_printk - Verified with tools/testing/selftests/bpf: ./test_progs -t snprintf ==================== Link: https://patch.msgid.link/20260416120142.1420646-1-dingyihan@uniontech.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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