mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Yonghong SongandAlexei Starovoitov
9f42204c62
Add negative tests that verify the kfunc (rejecting kfunc call with >8 byte struct as stack argument) and the verifier (rejecting invalid uses of r11 for stack arguments). Signed-off-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/r/20260513045132.2398371-1-yonghong.song@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
115 lines
2.1 KiB
C
115 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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#include "../test_kmods/bpf_testmod_kfunc.h"
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#include "bpf_misc.h"
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#if defined(__BPF_FEATURE_STACK_ARGUMENT)
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SEC("tc")
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__failure __msg("Unrecognized *(R11-8) type STRUCT")
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int test_stack_arg_big(struct __sk_buff *skb)
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{
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struct prog_test_big_arg s = { .a = 1, .b = 2 };
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return bpf_kfunc_call_stack_arg_big(1, 2, 3, 4, 5, s);
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}
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SEC("socket")
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__description("r11 in ALU instruction")
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__failure __msg("R11 is invalid")
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__naked void r11_alu_reject(void)
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{
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asm volatile (
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"r11 += 1;"
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"r0 = 0;"
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"exit;"
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::: __clobber_all);
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}
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SEC("socket")
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__description("r11 store with non-DW size")
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__failure __msg("R11 is invalid")
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__naked void r11_store_non_dw(void)
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{
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asm volatile (
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"*(u32 *)(r11 - 8) = r1;"
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"r0 = 0;"
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"exit;"
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::: __clobber_all);
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}
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SEC("socket")
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__description("r11 store with unaligned offset")
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__failure __msg("R11 is invalid")
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__naked void r11_store_unaligned(void)
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{
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asm volatile (
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"*(u64 *)(r11 - 4) = r1;"
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"r0 = 0;"
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"exit;"
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::: __clobber_all);
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}
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SEC("socket")
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__description("r11 store with positive offset")
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__failure __msg("R11 is invalid")
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__naked void r11_store_positive_off(void)
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{
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asm volatile (
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"*(u64 *)(r11 + 8) = r1;"
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"r0 = 0;"
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"exit;"
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::: __clobber_all);
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}
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SEC("socket")
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__description("r11 load with negative offset")
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__failure __msg("R11 is invalid")
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__naked void r11_load_negative_off(void)
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{
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asm volatile (
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"r0 = *(u64 *)(r11 - 8);"
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"exit;"
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::: __clobber_all);
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}
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SEC("socket")
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__description("r11 load with non-DW size")
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__failure __msg("R11 is invalid")
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__naked void r11_load_non_dw(void)
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{
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asm volatile (
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"r0 = *(u32 *)(r11 + 8);"
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"exit;"
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::: __clobber_all);
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}
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SEC("socket")
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__description("r11 store with zero offset")
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__failure __msg("R11 is invalid")
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__naked void r11_store_zero_off(void)
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{
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asm volatile (
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"*(u64 *)(r11 + 0) = r1;"
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"r0 = 0;"
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"exit;"
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::: __clobber_all);
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}
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#else
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SEC("tc")
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__description("stack_arg_fail: not supported, dummy test")
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__success
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int test_stack_arg_big(struct __sk_buff *skb)
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{
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return 0;
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}
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#endif
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char _license[] SEC("license") = "GPL";
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