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| author | David S. Miller <davem@davemloft.net> | 2018-01-11 21:27:54 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-01-11 22:13:42 -0500 |
| commit | 19d28fbd306e7ae7c1acf05c3e6968b56f0d196b (patch) | |
| tree | 0584a3a4639424733bad7714796f858aa7addee7 /kernel/bpf/core.c | |
| parent | 8c2e6c904fd8701a8d02d2bdb86871dc3ec4e85b (diff) | |
| parent | 1545dec46db3858bbce84c2065b579e2925706ab (diff) | |
| download | linux-19d28fbd306e7ae7c1acf05c3e6968b56f0d196b.tar.bz2 | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
BPF alignment tests got a conflict because the registers
are output as Rn_w instead of just Rn in net-next, and
in net a fixup for a testcase prohibits logical operations
on pointers before using them.
Also, we should attempt to patch BPF call args if JIT always on is
enabled. Instead, if we fail to JIT the subprogs we should pass
an error back up and fail immediately.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf/core.c')
| -rw-r--r-- | kernel/bpf/core.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index 70a534549cd3..25e723b0dfd4 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -781,6 +781,7 @@ noinline u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5) } EXPORT_SYMBOL_GPL(__bpf_call_base); +#ifndef CONFIG_BPF_JIT_ALWAYS_ON /** * __bpf_prog_run - run eBPF program on a given context * @ctx: is the data we are operating on @@ -1377,6 +1378,14 @@ void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth) insn->code = BPF_JMP | BPF_CALL_ARGS; } +#else +static unsigned int __bpf_prog_ret0(const void *ctx, + const struct bpf_insn *insn) +{ + return 0; +} +#endif + bool bpf_prog_array_compatible(struct bpf_array *array, const struct bpf_prog *fp) { @@ -1427,9 +1436,13 @@ static int bpf_check_tail_call(const struct bpf_prog *fp) */ struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err) { +#ifndef CONFIG_BPF_JIT_ALWAYS_ON u32 stack_depth = max_t(u32, fp->aux->stack_depth, 1); fp->bpf_func = interpreters[(round_up(stack_depth, 32) / 32) - 1]; +#else + fp->bpf_func = __bpf_prog_ret0; +#endif /* eBPF JITs can rewrite the program in case constant * blinding is active. However, in case of error during @@ -1439,6 +1452,12 @@ struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err) */ if (!bpf_prog_is_dev_bound(fp->aux)) { fp = bpf_int_jit_compile(fp); +#ifdef CONFIG_BPF_JIT_ALWAYS_ON + if (!fp->jited) { + *err = -ENOTSUPP; + return fp; + } +#endif } else { *err = bpf_prog_offload_compile(fp); if (*err) |