diff options
Diffstat (limited to 'arch/x86/net/bpf_jit_comp.c')
| -rw-r--r-- | arch/x86/net/bpf_jit_comp.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c index 4c8a2d1f8470..9ba08e9abc09 100644 --- a/arch/x86/net/bpf_jit_comp.c +++ b/arch/x86/net/bpf_jit_comp.c @@ -1328,7 +1328,7 @@ emit_jmp: return proglen; } -static void save_regs(struct btf_func_model *m, u8 **prog, int nr_args, +static void save_regs(const struct btf_func_model *m, u8 **prog, int nr_args, int stack_size) { int i; @@ -1344,7 +1344,7 @@ static void save_regs(struct btf_func_model *m, u8 **prog, int nr_args, -(stack_size - i * 8)); } -static void restore_regs(struct btf_func_model *m, u8 **prog, int nr_args, +static void restore_regs(const struct btf_func_model *m, u8 **prog, int nr_args, int stack_size) { int i; @@ -1361,7 +1361,7 @@ static void restore_regs(struct btf_func_model *m, u8 **prog, int nr_args, -(stack_size - i * 8)); } -static int invoke_bpf(struct btf_func_model *m, u8 **pprog, +static int invoke_bpf(const struct btf_func_model *m, u8 **pprog, struct bpf_prog **progs, int prog_cnt, int stack_size) { u8 *prog = *pprog; @@ -1456,7 +1456,8 @@ static int invoke_bpf(struct btf_func_model *m, u8 **pprog, * add rsp, 8 // skip eth_type_trans's frame * ret // return to its caller */ -int arch_prepare_bpf_trampoline(void *image, struct btf_func_model *m, u32 flags, +int arch_prepare_bpf_trampoline(void *image, void *image_end, + const struct btf_func_model *m, u32 flags, struct bpf_prog **fentry_progs, int fentry_cnt, struct bpf_prog **fexit_progs, int fexit_cnt, void *orig_call) @@ -1523,13 +1524,10 @@ int arch_prepare_bpf_trampoline(void *image, struct btf_func_model *m, u32 flags /* skip our return address and return to parent */ EMIT4(0x48, 0x83, 0xC4, 8); /* add rsp, 8 */ EMIT1(0xC3); /* ret */ - /* One half of the page has active running trampoline. - * Another half is an area for next trampoline. - * Make sure the trampoline generation logic doesn't overflow. - */ - if (WARN_ON_ONCE(prog - (u8 *)image > PAGE_SIZE / 2 - BPF_INSN_SAFETY)) + /* Make sure the trampoline generation logic doesn't overflow */ + if (WARN_ON_ONCE(prog > (u8 *)image_end - BPF_INSN_SAFETY)) return -EFAULT; - return 0; + return prog - (u8 *)image; } static int emit_cond_near_jump(u8 **pprog, void *func, void *ip, u8 jmp_cond) |