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Extend trace_printk coverage to verify that UTF-8 literal text is emitted successfully and that '%' parsing still rejects non-ASCII bytes once format parsing starts. Use an explicitly invalid format string for the negative case so the ASCII-only parser expectation is visible from the test code itself. Signed-off-by: Yihan Ding <dingyihan@uniontech.com> Acked-by: Paul Chaignon <paul.chaignon@gmail.com> Link: https://lore.kernel.org/r/20260416120142.1420646-3-dingyihan@uniontech.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
33 lines
963 B
C
33 lines
963 B
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020, Oracle and/or its affiliates.
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "bpf_misc.h"
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char _license[] SEC("license") = "GPL";
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int trace_printk_ret = 0;
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int trace_printk_ran = 0;
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int trace_printk_invalid_spec_ret = 0;
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int trace_printk_utf8_ret = 0;
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int trace_printk_utf8_ran = 0;
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const char fmt[] = "Testing,testing %d\n";
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static const char utf8_fmt[] = "中文,测试 %d\n";
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/* Non-ASCII bytes after '%' must still be rejected. */
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static const char invalid_spec_fmt[] = "%\x80\n";
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SEC("fentry/" SYS_PREFIX "sys_nanosleep")
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int sys_enter(void *ctx)
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{
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trace_printk_ret = bpf_trace_printk(fmt, sizeof(fmt),
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++trace_printk_ran);
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trace_printk_utf8_ret = bpf_trace_printk(utf8_fmt, sizeof(utf8_fmt),
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++trace_printk_utf8_ran);
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trace_printk_invalid_spec_ret = bpf_trace_printk(invalid_spec_fmt,
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sizeof(invalid_spec_fmt));
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return 0;
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}
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