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selftests/bpf: add fp-leaking precise subprog result tests

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Add selftests validating that BPF verifier handles precision marking
for SCALAR registers derived from r10 (fp) register correctly.

Given `r0 = (s8)r10;` syntax is not supported by older Clang compilers,
use the raw BPF instruction syntax to maximize compatibility.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20240404214536.3551295-2-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko
2024-04-04 14:45:36 -07:00
committed by Alexei Starovoitov
parent 1f2a74b41e
commit 343ca8131c
2 changed files with 107 additions and 0 deletions
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tools/include/linux/filter.h
+18
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@@ -111,6 +111,24 @@
.off = 0, \
.imm = IMM })
/* Short form of movsx, dst_reg = (s8,s16,s32)src_reg */
#define BPF_MOVSX64_REG(DST, SRC, OFF) \
((struct bpf_insn) { \
.code = BPF_ALU64 | BPF_MOV | BPF_X, \
.dst_reg = DST, \
.src_reg = SRC, \
.off = OFF, \
.imm = 0 })
#define BPF_MOVSX32_REG(DST, SRC, OFF) \
((struct bpf_insn) { \
.code = BPF_ALU | BPF_MOV | BPF_X, \
.dst_reg = DST, \
.src_reg = SRC, \
.off = OFF, \
.imm = 0 })
/* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
#define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \