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bpf: allow UTF-8 literals in bpf_bprintf_prepare()

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bpf_bprintf_prepare() only needs ASCII parsing for conversion
specifiers. Plain text can safely carry bytes >= 0x80, so allow
UTF-8 literals outside '%' sequences while keeping ASCII control
bytes rejected and format specifiers ASCII-only.

This keeps existing parsing rules for format directives unchanged,
while allowing helpers such as bpf_trace_printk() to emit UTF-8
literal text.

Update test_snprintf_negative() in the same commit so selftests keep
matching the new plain-text vs format-specifier split during bisection.

Fixes: 48cac3f4a9 ("bpf: Implement formatted output helpers with bstr_printf")
Signed-off-by: Yihan Ding <dingyihan@uniontech.com>
Acked-by: Paul Chaignon <paul.chaignon@gmail.com>
Link: https://lore.kernel.org/r/20260416120142.1420646-2-dingyihan@uniontech.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yihan Ding
2026-04-16 20:01:41 +08:00
committed by Alexei Starovoitov
parent 766bf026d0
commit b960430ea8
2 changed files with 18 additions and 2 deletions
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3
tools/testing/selftests/bpf/prog_tests/snprintf.c
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@@ -114,7 +114,8 @@ static void test_snprintf_negative(void)
ASSERT_ERR(load_single_snprintf("%--------"), "invalid specifier 5");
ASSERT_ERR(load_single_snprintf("%lc"), "invalid specifier 6");
ASSERT_ERR(load_single_snprintf("%llc"), "invalid specifier 7");
ASSERT_ERR(load_single_snprintf("\x80"), "non ascii character");
ASSERT_OK(load_single_snprintf("\x80"), "non ascii plain text");
ASSERT_ERR(load_single_snprintf("%\x80"), "non ascii in specifier");
ASSERT_ERR(load_single_snprintf("\x1"), "non printable character");
ASSERT_ERR(load_single_snprintf("%p%"), "invalid specifier 8");
ASSERT_ERR(load_single_snprintf("%s%"), "invalid specifier 9");