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-rw-r--r--tools/testing/selftests/bpf/progs/verifier_regalloc.c364
1 files changed, 364 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/verifier_regalloc.c b/tools/testing/selftests/bpf/progs/verifier_regalloc.c
new file mode 100644
index 000000000000..ee5ddea87c91
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/verifier_regalloc.c
@@ -0,0 +1,364 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Converted from tools/testing/selftests/bpf/verifier/regalloc.c */
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include "bpf_misc.h"
+
+#define MAX_ENTRIES 11
+
+struct test_val {
+ unsigned int index;
+ int foo[MAX_ENTRIES];
+};
+
+struct {
+ __uint(type, BPF_MAP_TYPE_HASH);
+ __uint(max_entries, 1);
+ __type(key, long long);
+ __type(value, struct test_val);
+} map_hash_48b SEC(".maps");
+
+SEC("tracepoint")
+__description("regalloc basic")
+__success __flag(BPF_F_ANY_ALIGNMENT)
+__naked void regalloc_basic(void)
+{
+ asm volatile (" \
+ r6 = r1; \
+ r1 = 0; \
+ *(u64*)(r10 - 8) = r1; \
+ r2 = r10; \
+ r2 += -8; \
+ r1 = %[map_hash_48b] ll; \
+ call %[bpf_map_lookup_elem]; \
+ if r0 == 0 goto l0_%=; \
+ r7 = r0; \
+ call %[bpf_get_prandom_u32]; \
+ r2 = r0; \
+ if r0 s> 20 goto l0_%=; \
+ if r2 s< 0 goto l0_%=; \
+ r7 += r0; \
+ r7 += r2; \
+ r0 = *(u64*)(r7 + 0); \
+l0_%=: exit; \
+" :
+ : __imm(bpf_get_prandom_u32),
+ __imm(bpf_map_lookup_elem),
+ __imm_addr(map_hash_48b)
+ : __clobber_all);
+}
+
+SEC("tracepoint")
+__description("regalloc negative")
+__failure __msg("invalid access to map value, value_size=48 off=48 size=1")
+__naked void regalloc_negative(void)
+{
+ asm volatile (" \
+ r6 = r1; \
+ r1 = 0; \
+ *(u64*)(r10 - 8) = r1; \
+ r2 = r10; \
+ r2 += -8; \
+ r1 = %[map_hash_48b] ll; \
+ call %[bpf_map_lookup_elem]; \
+ if r0 == 0 goto l0_%=; \
+ r7 = r0; \
+ call %[bpf_get_prandom_u32]; \
+ r2 = r0; \
+ if r0 s> 24 goto l0_%=; \
+ if r2 s< 0 goto l0_%=; \
+ r7 += r0; \
+ r7 += r2; \
+ r0 = *(u8*)(r7 + 0); \
+l0_%=: exit; \
+" :
+ : __imm(bpf_get_prandom_u32),
+ __imm(bpf_map_lookup_elem),
+ __imm_addr(map_hash_48b)
+ : __clobber_all);
+}
+
+SEC("tracepoint")
+__description("regalloc src_reg mark")
+__success __flag(BPF_F_ANY_ALIGNMENT)
+__naked void regalloc_src_reg_mark(void)
+{
+ asm volatile (" \
+ r6 = r1; \
+ r1 = 0; \
+ *(u64*)(r10 - 8) = r1; \
+ r2 = r10; \
+ r2 += -8; \
+ r1 = %[map_hash_48b] ll; \
+ call %[bpf_map_lookup_elem]; \
+ if r0 == 0 goto l0_%=; \
+ r7 = r0; \
+ call %[bpf_get_prandom_u32]; \
+ r2 = r0; \
+ if r0 s> 20 goto l0_%=; \
+ r3 = 0; \
+ if r3 s>= r2 goto l0_%=; \
+ r7 += r0; \
+ r7 += r2; \
+ r0 = *(u64*)(r7 + 0); \
+l0_%=: exit; \
+" :
+ : __imm(bpf_get_prandom_u32),
+ __imm(bpf_map_lookup_elem),
+ __imm_addr(map_hash_48b)
+ : __clobber_all);
+}
+
+SEC("tracepoint")
+__description("regalloc src_reg negative")
+__failure __msg("invalid access to map value, value_size=48 off=44 size=8")
+__flag(BPF_F_ANY_ALIGNMENT)
+__naked void regalloc_src_reg_negative(void)
+{
+ asm volatile (" \
+ r6 = r1; \
+ r1 = 0; \
+ *(u64*)(r10 - 8) = r1; \
+ r2 = r10; \
+ r2 += -8; \
+ r1 = %[map_hash_48b] ll; \
+ call %[bpf_map_lookup_elem]; \
+ if r0 == 0 goto l0_%=; \
+ r7 = r0; \
+ call %[bpf_get_prandom_u32]; \
+ r2 = r0; \
+ if r0 s> 22 goto l0_%=; \
+ r3 = 0; \
+ if r3 s>= r2 goto l0_%=; \
+ r7 += r0; \
+ r7 += r2; \
+ r0 = *(u64*)(r7 + 0); \
+l0_%=: exit; \
+" :
+ : __imm(bpf_get_prandom_u32),
+ __imm(bpf_map_lookup_elem),
+ __imm_addr(map_hash_48b)
+ : __clobber_all);
+}
+
+SEC("tracepoint")
+__description("regalloc and spill")
+__success __flag(BPF_F_ANY_ALIGNMENT)
+__naked void regalloc_and_spill(void)
+{
+ asm volatile (" \
+ r6 = r1; \
+ r1 = 0; \
+ *(u64*)(r10 - 8) = r1; \
+ r2 = r10; \
+ r2 += -8; \
+ r1 = %[map_hash_48b] ll; \
+ call %[bpf_map_lookup_elem]; \
+ if r0 == 0 goto l0_%=; \
+ r7 = r0; \
+ call %[bpf_get_prandom_u32]; \
+ r2 = r0; \
+ if r0 s> 20 goto l0_%=; \
+ /* r0 has upper bound that should propagate into r2 */\
+ *(u64*)(r10 - 8) = r2; /* spill r2 */ \
+ r0 = 0; \
+ r2 = 0; /* clear r0 and r2 */\
+ r3 = *(u64*)(r10 - 8); /* fill r3 */ \
+ if r0 s>= r3 goto l0_%=; \
+ /* r3 has lower and upper bounds */ \
+ r7 += r3; \
+ r0 = *(u64*)(r7 + 0); \
+l0_%=: exit; \
+" :
+ : __imm(bpf_get_prandom_u32),
+ __imm(bpf_map_lookup_elem),
+ __imm_addr(map_hash_48b)
+ : __clobber_all);
+}
+
+SEC("tracepoint")
+__description("regalloc and spill negative")
+__failure __msg("invalid access to map value, value_size=48 off=48 size=8")
+__flag(BPF_F_ANY_ALIGNMENT)
+__naked void regalloc_and_spill_negative(void)
+{
+ asm volatile (" \
+ r6 = r1; \
+ r1 = 0; \
+ *(u64*)(r10 - 8) = r1; \
+ r2 = r10; \
+ r2 += -8; \
+ r1 = %[map_hash_48b] ll; \
+ call %[bpf_map_lookup_elem]; \
+ if r0 == 0 goto l0_%=; \
+ r7 = r0; \
+ call %[bpf_get_prandom_u32]; \
+ r2 = r0; \
+ if r0 s> 48 goto l0_%=; \
+ /* r0 has upper bound that should propagate into r2 */\
+ *(u64*)(r10 - 8) = r2; /* spill r2 */ \
+ r0 = 0; \
+ r2 = 0; /* clear r0 and r2 */\
+ r3 = *(u64*)(r10 - 8); /* fill r3 */\
+ if r0 s>= r3 goto l0_%=; \
+ /* r3 has lower and upper bounds */ \
+ r7 += r3; \
+ r0 = *(u64*)(r7 + 0); \
+l0_%=: exit; \
+" :
+ : __imm(bpf_get_prandom_u32),
+ __imm(bpf_map_lookup_elem),
+ __imm_addr(map_hash_48b)
+ : __clobber_all);
+}
+
+SEC("tracepoint")
+__description("regalloc three regs")
+__success __flag(BPF_F_ANY_ALIGNMENT)
+__naked void regalloc_three_regs(void)
+{
+ asm volatile (" \
+ r6 = r1; \
+ r1 = 0; \
+ *(u64*)(r10 - 8) = r1; \
+ r2 = r10; \
+ r2 += -8; \
+ r1 = %[map_hash_48b] ll; \
+ call %[bpf_map_lookup_elem]; \
+ if r0 == 0 goto l0_%=; \
+ r7 = r0; \
+ call %[bpf_get_prandom_u32]; \
+ r2 = r0; \
+ r4 = r2; \
+ if r0 s> 12 goto l0_%=; \
+ if r2 s< 0 goto l0_%=; \
+ r7 += r0; \
+ r7 += r2; \
+ r7 += r4; \
+ r0 = *(u64*)(r7 + 0); \
+l0_%=: exit; \
+" :
+ : __imm(bpf_get_prandom_u32),
+ __imm(bpf_map_lookup_elem),
+ __imm_addr(map_hash_48b)
+ : __clobber_all);
+}
+
+SEC("tracepoint")
+__description("regalloc after call")
+__success __flag(BPF_F_ANY_ALIGNMENT)
+__naked void regalloc_after_call(void)
+{
+ asm volatile (" \
+ r6 = r1; \
+ r1 = 0; \
+ *(u64*)(r10 - 8) = r1; \
+ r2 = r10; \
+ r2 += -8; \
+ r1 = %[map_hash_48b] ll; \
+ call %[bpf_map_lookup_elem]; \
+ if r0 == 0 goto l0_%=; \
+ r7 = r0; \
+ call %[bpf_get_prandom_u32]; \
+ r8 = r0; \
+ r9 = r0; \
+ call regalloc_after_call__1; \
+ if r8 s> 20 goto l0_%=; \
+ if r9 s< 0 goto l0_%=; \
+ r7 += r8; \
+ r7 += r9; \
+ r0 = *(u64*)(r7 + 0); \
+l0_%=: exit; \
+" :
+ : __imm(bpf_get_prandom_u32),
+ __imm(bpf_map_lookup_elem),
+ __imm_addr(map_hash_48b)
+ : __clobber_all);
+}
+
+static __naked __noinline __attribute__((used))
+void regalloc_after_call__1(void)
+{
+ asm volatile (" \
+ r0 = 0; \
+ exit; \
+" ::: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("regalloc in callee")
+__success __flag(BPF_F_ANY_ALIGNMENT)
+__naked void regalloc_in_callee(void)
+{
+ asm volatile (" \
+ r6 = r1; \
+ r1 = 0; \
+ *(u64*)(r10 - 8) = r1; \
+ r2 = r10; \
+ r2 += -8; \
+ r1 = %[map_hash_48b] ll; \
+ call %[bpf_map_lookup_elem]; \
+ if r0 == 0 goto l0_%=; \
+ r7 = r0; \
+ call %[bpf_get_prandom_u32]; \
+ r1 = r0; \
+ r2 = r0; \
+ r3 = r7; \
+ call regalloc_in_callee__1; \
+l0_%=: exit; \
+" :
+ : __imm(bpf_get_prandom_u32),
+ __imm(bpf_map_lookup_elem),
+ __imm_addr(map_hash_48b)
+ : __clobber_all);
+}
+
+static __naked __noinline __attribute__((used))
+void regalloc_in_callee__1(void)
+{
+ asm volatile (" \
+ if r1 s> 20 goto l0_%=; \
+ if r2 s< 0 goto l0_%=; \
+ r3 += r1; \
+ r3 += r2; \
+ r0 = *(u64*)(r3 + 0); \
+ exit; \
+l0_%=: r0 = 0; \
+ exit; \
+" ::: __clobber_all);
+}
+
+SEC("tracepoint")
+__description("regalloc, spill, JEQ")
+__success
+__naked void regalloc_spill_jeq(void)
+{
+ asm volatile (" \
+ r6 = r1; \
+ r1 = 0; \
+ *(u64*)(r10 - 8) = r1; \
+ r2 = r10; \
+ r2 += -8; \
+ r1 = %[map_hash_48b] ll; \
+ call %[bpf_map_lookup_elem]; \
+ *(u64*)(r10 - 8) = r0; /* spill r0 */ \
+ if r0 == 0 goto l0_%=; \
+l0_%=: /* The verifier will walk the rest twice with r0 == 0 and r0 == map_value */\
+ call %[bpf_get_prandom_u32]; \
+ r2 = r0; \
+ if r2 == 20 goto l1_%=; \
+l1_%=: /* The verifier will walk the rest two more times with r0 == 20 and r0 == unknown */\
+ r3 = *(u64*)(r10 - 8); /* fill r3 with map_value */\
+ if r3 == 0 goto l2_%=; /* skip ldx if map_value == NULL */\
+ /* Buggy verifier will think that r3 == 20 here */\
+ r0 = *(u64*)(r3 + 0); /* read from map_value */\
+l2_%=: exit; \
+" :
+ : __imm(bpf_get_prandom_u32),
+ __imm(bpf_map_lookup_elem),
+ __imm_addr(map_hash_48b)
+ : __clobber_all);
+}
+
+char _license[] SEC("license") = "GPL";
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.