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selftests/bpf: Add more ring buffer test coverage
Add test coverage for reservations beyond the ring buffer size in order to validate that bpf_ringbuf_reserve() rejects the request with NULL, all other ring buffer tests keep passing as well: # ./vmtest.sh -- ./test_progs -t ringbuf [...] ./test_progs -t ringbuf [ 1.165434] bpf_testmod: loading out-of-tree module taints kernel. [ 1.165825] bpf_testmod: module verification failed: signature and/or required key missing - tainting kernel [ 1.284001] tsc: Refined TSC clocksource calibration: 3407.982 MHz [ 1.286871] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fc34e357, max_idle_ns: 440795379773 ns [ 1.289555] clocksource: Switched to clocksource tsc torvalds#274/1 ringbuf/ringbuf:OK torvalds#274/2 ringbuf/ringbuf_n:OK torvalds#274/3 ringbuf/ringbuf_map_key:OK torvalds#274/4 ringbuf/ringbuf_write:OK torvalds#274 ringbuf:OK torvalds#275 ringbuf_multi:OK [...] Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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// SPDX-License-Identifier: GPL-2.0 | ||
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#include <linux/bpf.h> | ||
#include <bpf/bpf_helpers.h> | ||
#include "bpf_misc.h" | ||
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char _license[] SEC("license") = "GPL"; | ||
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struct { | ||
__uint(type, BPF_MAP_TYPE_RINGBUF); | ||
} ringbuf SEC(".maps"); | ||
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long discarded, passed; | ||
int pid; | ||
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SEC("fentry/" SYS_PREFIX "sys_getpgid") | ||
int test_ringbuf_write(void *ctx) | ||
{ | ||
int *foo, cur_pid = bpf_get_current_pid_tgid() >> 32; | ||
void *sample1, *sample2; | ||
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if (cur_pid != pid) | ||
return 0; | ||
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sample1 = bpf_ringbuf_reserve(&ringbuf, 0x3000, 0); | ||
if (!sample1) | ||
return 0; | ||
/* first one can pass */ | ||
sample2 = bpf_ringbuf_reserve(&ringbuf, 0x3000, 0); | ||
if (!sample2) { | ||
bpf_ringbuf_discard(sample1, 0); | ||
__sync_fetch_and_add(&discarded, 1); | ||
return 0; | ||
} | ||
/* second one must not */ | ||
__sync_fetch_and_add(&passed, 1); | ||
foo = sample2 + 4084; | ||
*foo = 256; | ||
bpf_ringbuf_discard(sample1, 0); | ||
bpf_ringbuf_discard(sample2, 0); | ||
return 0; | ||
} |