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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
#include "../test_kmods/bpf_testmod_kfunc.h"
/* Keep the kfunc BTF records used by the inline assembly. */
void __kfunc_btf_root(void)
{
asm volatile ("" :
: "r"(&bpf_kfunc_test_uninit_struct),
"r"(&bpf_kfunc_test_uninit_mem),
"r"(&bpf_kfunc_test_uninit_partial),
"r"(&bpf_kfunc_test_uninit_alias));
}
SEC("tc")
__success __retval(10)
__flag(BPF_F_TEST_STATE_FREQ)
__caps_unpriv(CAP_BPF | CAP_NET_ADMIN)
__prepare_priv
__success_unpriv
__naked void struct_poisoned_at_checkpoint(void)
{
asm volatile (
"*(u64 *)(r10 - 16) = 0;"
"*(u64 *)(r10 - 8) = 0;"
"goto +0;"
"r1 = r10;"
"r1 += -16;"
"call %[bpf_kfunc_test_uninit_struct];"
"r0 = *(u32 *)(r10 - 16);"
"r1 = *(u32 *)(r10 - 12);"
"r0 += r1;"
"r1 = *(u32 *)(r10 - 8);"
"r0 += r1;"
"r1 = *(u32 *)(r10 - 4);"
"r0 += r1;"
"exit;"
: : __imm(bpf_kfunc_test_uninit_struct) : __clobber_all);
}
SEC("tc")
__success __retval(0x2a2a2a2a)
__flag(BPF_F_TEST_STATE_FREQ)
__caps_unpriv(CAP_BPF | CAP_NET_ADMIN)
__prepare_priv
__success_unpriv
__naked void sized_buffer_poisoned_at_checkpoint(void)
{
asm volatile (
"*(u64 *)(r10 - 8) = 0;"
"goto +0;"
"r1 = r10;"
"r1 += -8;"
"r2 = 8;"
"call %[bpf_kfunc_test_uninit_mem];"
"r0 = *(u32 *)(r10 - 8);"
"r1 = *(u32 *)(r10 - 4);"
"if r0 == r1 goto +1;"
"r0 = 0;"
"exit;"
: : __imm(bpf_kfunc_test_uninit_mem) : __clobber_all);
}
SEC("tc")
__success __retval(7)
__caps_unpriv(CAP_BPF | CAP_NET_ADMIN)
__prepare_priv
__success_unpriv
__naked void initialized_input_alias(void)
{
asm volatile (
"*(u32 *)(r10 - 8) = 7;"
"r1 = r10;"
"r1 += -8;"
"r2 = r1;"
"call %[bpf_kfunc_test_uninit_alias];"
"exit;"
: : __imm(bpf_kfunc_test_uninit_alias) : __clobber_all);
}
SEC("tc")
__success
__caps_unpriv(CAP_BPF | CAP_NET_ADMIN)
__prepare_priv
__failure_unpriv __msg_unpriv("invalid read from stack")
__naked void uninitialized_input_alias(void)
{
asm volatile (
"r1 = r10;"
"r1 += -8;"
"r2 = r1;"
"call %[bpf_kfunc_test_uninit_alias];"
"exit;"
: : __imm(bpf_kfunc_test_uninit_alias) : __clobber_all);
}
SEC("tc")
__success __retval(0)
__caps_unpriv(CAP_BPF | CAP_NET_ADMIN)
__prepare_priv
__success_unpriv
__naked void uninitialized_struct_output_ignored(void)
{
asm volatile (
"r1 = r10;"
"r1 += -16;"
"call %[bpf_kfunc_test_uninit_struct];"
"r0 = 0;"
"exit;"
: : __imm(bpf_kfunc_test_uninit_struct) : __clobber_all);
}
SEC("tc")
__success __retval(0)
__caps_unpriv(CAP_BPF | CAP_NET_ADMIN)
__prepare_priv
__success_unpriv
__naked void variable_size_uninitialized_output_ignored(void)
{
asm volatile (
"r2 = *(u32 *)(r1 + 0);"
"r2 &= 7;"
"r2 += 1;"
"r1 = r10;"
"r1 += -8;"
"call %[bpf_kfunc_test_uninit_mem];"
"r0 = 0;"
"exit;"
: : __imm(bpf_kfunc_test_uninit_mem) : __clobber_all);
}
SEC("tc")
__success __retval(49)
__flag(BPF_F_TEST_STATE_FREQ)
__caps_unpriv(CAP_BPF | CAP_NET_ADMIN)
__prepare_priv
__success_unpriv
__naked void partial_output_preserves_initialized_bytes(void)
{
asm volatile (
"*(u8 *)(r10 - 8) = 0;"
"*(u8 *)(r10 - 1) = 7;"
"goto +0;"
"r1 = r10;"
"r1 += -8;"
"r2 = 8;"
"call %[bpf_kfunc_test_uninit_partial];"
"r0 = *(u8 *)(r10 - 8);"
"r1 = *(u8 *)(r10 - 1);"
"r0 += r1;"
"exit;"
: : __imm(bpf_kfunc_test_uninit_partial) : __clobber_all);
}
SEC("tc")
__success __retval(42)
__caps_unpriv(CAP_BPF | CAP_NET_ADMIN)
__prepare_priv
__failure_unpriv __msg_unpriv("invalid read from stack off -8+0 size 1")
__naked void uninitialized_sized_output_read(void)
{
asm volatile (
"r1 = r10;"
"r1 += -8;"
"r2 = 8;"
"call %[bpf_kfunc_test_uninit_mem];"
"r0 = *(u8 *)(r10 - 8);"
"exit;"
: : __imm(bpf_kfunc_test_uninit_mem) : __clobber_all);
}
SEC("tc")
__success __retval(42)
__caps_unpriv(CAP_BPF | CAP_NET_ADMIN)
__prepare_priv
__failure_unpriv __msg_unpriv("invalid read from stack off -8+0 size 1")
__naked void variable_size_uninitialized_output_read(void)
{
asm volatile (
"r2 = *(u32 *)(r1 + 0);"
"r2 &= 7;"
"r2 += 1;"
"r1 = r10;"
"r1 += -8;"
"call %[bpf_kfunc_test_uninit_mem];"
"r0 = *(u8 *)(r10 - 8);"
"exit;"
: : __imm(bpf_kfunc_test_uninit_mem) : __clobber_all);
}
SEC("tc")
__success __retval(1)
__caps_unpriv(CAP_BPF | CAP_NET_ADMIN)
__prepare_priv
__failure_unpriv __msg_unpriv("invalid read from stack off -16+0 size 4")
__naked void fixed_struct_uninitialized_output_read(void)
{
asm volatile (
"r1 = r10;"
"r1 += -16;"
"call %[bpf_kfunc_test_uninit_struct];"
"r0 = *(u32 *)(r10 - 16);"
"exit;"
: : __imm(bpf_kfunc_test_uninit_struct) : __clobber_all);
}
SEC("tc")
__success __retval(49)
__flag(BPF_F_TEST_STATE_FREQ)
__caps_unpriv(CAP_BPF | CAP_NET_ADMIN)
__prepare_priv
__success_unpriv
__naked void partial_output_variable_size(void)
{
asm volatile (
"r2 = *(u32 *)(r1 + 0);"
"r2 &= 7;"
"r2 += 1;"
"*(u8 *)(r10 - 8) = 0;"
"*(u8 *)(r10 - 1) = 7;"
"goto +0;"
"r1 = r10;"
"r1 += -8;"
"call %[bpf_kfunc_test_uninit_partial];"
"r0 = *(u8 *)(r10 - 8);"
"r1 = *(u8 *)(r10 - 1);"
"r0 += r1;"
"exit;"
: : __imm(bpf_kfunc_test_uninit_partial) : __clobber_all);
}
char _license[] SEC("license") = "GPL";
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