diff options
| author | Eduard Zingerman <eddyz87@gmail.com> | 2025-06-26 18:55:39 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2025-06-27 18:55:28 -0700 |
| commit | c4b1be928ea05add0e0f9334e5bc44932395782e (patch) | |
| tree | ac89de1873c4d3d7608d5d4edd17cee4e7181e29 | |
| parent | ffaff1804e2ca1e88caa9d2e13ac6b4b7ecf011c (diff) | |
selftests/bpf: bpf_rdonly_cast u{8,16,32,64} access tests
Tests with aligned and misaligned memory access of different sizes via
pointer returned by bpf_rdonly_cast().
Suggested-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20250627015539.1439656-1-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
| -rw-r--r-- | tools/testing/selftests/bpf/progs/mem_rdonly_untrusted.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/mem_rdonly_untrusted.c b/tools/testing/selftests/bpf/progs/mem_rdonly_untrusted.c index 00604755e698..b0486af36f55 100644 --- a/tools/testing/selftests/bpf/progs/mem_rdonly_untrusted.c +++ b/tools/testing/selftests/bpf/progs/mem_rdonly_untrusted.c @@ -133,4 +133,45 @@ int mixed_mem_type(void *ctx) return *p; } +__attribute__((__aligned__(8))) +u8 global[] = { + 0x11, 0x22, 0x33, 0x44, + 0x55, 0x66, 0x77, 0x88, + 0x99 +}; + +__always_inline +static u64 combine(void *p) +{ + u64 acc; + + acc = 0; +#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ + acc |= (*(u64 *)p >> 56) << 24; + acc |= (*(u32 *)p >> 24) << 16; + acc |= (*(u16 *)p >> 8) << 8; + acc |= *(u8 *)p; +#else + acc |= (*(u64 *)p & 0xff) << 24; + acc |= (*(u32 *)p & 0xff) << 16; + acc |= (*(u16 *)p & 0xff) << 8; + acc |= *(u8 *)p; +#endif + return acc; +} + +SEC("socket") +__retval(0x88442211) +int diff_size_access(void *ctx) +{ + return combine(bpf_rdonly_cast(&global, 0)); +} + +SEC("socket") +__retval(0x99553322) +int misaligned_access(void *ctx) +{ + return combine(bpf_rdonly_cast(&global, 0) + 1); +} + char _license[] SEC("license") = "GPL"; |