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authorAlexei Starovoitov <ast@kernel.org>2019-11-14 10:57:03 -0800
committerDaniel Borkmann <daniel@iogearbox.net>2019-11-15 23:41:28 +0100
commit5964b2000f283ff5df366f718e0f083ebbaae977 (patch)
tree1c9340853eb72ac070354a5f1291a976ba66911d /kernel
parent3b2744e665206ea82ce7673cb3ec889b2898a267 (diff)
downloadlinux-5964b2000f283ff5df366f718e0f083ebbaae977.tar.bz2
bpf: Add bpf_arch_text_poke() helper
Add bpf_arch_text_poke() helper that is used by BPF trampoline logic to patch nops/calls in kernel text into calls into BPF trampoline and to patch calls/nops inside BPF programs too. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Song Liu <songliubraving@fb.com> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20191114185720.1641606-4-ast@kernel.org
Diffstat (limited to 'kernel')
-rw-r--r--kernel/bpf/core.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 99693f3c4e99..434a0d920153 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -2144,6 +2144,12 @@ int __weak skb_copy_bits(const struct sk_buff *skb, int offset, void *to,
return -EFAULT;
}
+int __weak bpf_arch_text_poke(void *ip, enum bpf_text_poke_type t,
+ void *addr1, void *addr2)
+{
+ return -ENOTSUPP;
+}
+
DEFINE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
EXPORT_SYMBOL(bpf_stats_enabled_key);