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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e07b98d9bf
Add a new field, "prog_flags", and an initial flag value BPF_F_STRICT_ALIGNMENT. When set, the verifier will enforce strict pointer alignment regardless of the setting of CONFIG_EFFICIENT_UNALIGNED_ACCESS. The verifier, in this mode, will also use a fixed value of "2" in place of NET_IP_ALIGN. This facilitates test cases that will exercise and validate this part of the verifier even when run on architectures where alignment doesn't matter. Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Daniel Borkmann <daniel@iogearbox.net>
39 lines
815 B
C
39 lines
815 B
C
#include <asm/unistd.h>
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#include <linux/bpf.h>
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#include <unistd.h>
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#ifndef __NR_bpf
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# if defined(__i386__)
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# define __NR_bpf 357
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# elif defined(__x86_64__)
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# define __NR_bpf 321
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# elif defined(__aarch64__)
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# define __NR_bpf 280
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# elif defined(__sparc__)
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# define __NR_bpf 349
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# else
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# error __NR_bpf not defined. libbpf does not support your arch.
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# endif
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#endif
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int main(void)
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{
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union bpf_attr attr;
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/* Check fields in attr */
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attr.prog_type = BPF_PROG_TYPE_KPROBE;
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attr.insn_cnt = 0;
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attr.insns = 0;
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attr.license = 0;
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attr.log_buf = 0;
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attr.log_size = 0;
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attr.log_level = 0;
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attr.kern_version = 0;
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attr.prog_flags = 0;
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/*
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* Test existence of __NR_bpf and BPF_PROG_LOAD.
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* This call should fail if we run the testcase.
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*/
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return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
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}
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