linux-kernel - [PATCH 5.19 0491/1157] bpf, x64: Add predicate for bpf2bpf with tailcalls support in JIT

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Date:   Mon, 15 Aug 2022 19:57:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tony Ambardar <Tony.Ambardar@...il.com>,
        Jakub Sitnicki <jakub@...udflare.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0491/1157] bpf, x64: Add predicate for bpf2bpf with tailcalls support in JIT

From: Tony Ambardar <tony.ambardar@...il.com>

[ Upstream commit 95acd8817e66d031d2e6ee7def3f1e1874819317 ]

The BPF core/verifier is hard-coded to permit mixing bpf2bpf and tail
calls for only x86-64. Change the logic to instead rely on a new weak
function 'bool bpf_jit_supports_subprog_tailcalls(void)', which a capable
JIT backend can override.

Update the x86-64 eBPF JIT to reflect this.

Signed-off-by: Tony Ambardar <Tony.Ambardar@...il.com>
[jakub: drop MIPS bits and tweak patch subject]
Signed-off-by: Jakub Sitnicki <jakub@...udflare.com>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Link: https://lore.kernel.org/bpf/20220617105735.733938-2-jakub@cloudflare.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/x86/net/bpf_jit_comp.c | 6 ++++++
 include/linux/filter.h      | 1 +
 kernel/bpf/core.c           | 6 ++++++
 kernel/bpf/verifier.c       | 3 ++-
 4 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index b808c9a80d1b..eba704b9ce1e 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -2506,3 +2506,9 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len)
 		return ERR_PTR(-EINVAL);
 	return dst;
 }
+
+/* Indicate the JIT backend supports mixing bpf2bpf and tailcalls. */
+bool bpf_jit_supports_subprog_tailcalls(void)
+{
+	return true;
+}
diff --git a/include/linux/filter.h b/include/linux/filter.h
index ed0c0ff42ad5..d9a0db845b50 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -948,6 +948,7 @@ u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
 void bpf_jit_compile(struct bpf_prog *prog);
 bool bpf_jit_needs_zext(void);
+bool bpf_jit_supports_subprog_tailcalls(void);
 bool bpf_jit_supports_kfunc_call(void);
 bool bpf_helper_changes_pkt_data(void *func);
 
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index e7961508a47d..6e3fe4b7230b 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -2716,6 +2716,12 @@ bool __weak bpf_jit_needs_zext(void)
 	return false;
 }
 
+/* Return TRUE if the JIT backend supports mixing bpf2bpf and tailcalls. */
+bool __weak bpf_jit_supports_subprog_tailcalls(void)
+{
+	return false;
+}
+
 bool __weak bpf_jit_supports_kfunc_call(void)
 {
 	return false;
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 0efbac0fd126..602366bc230f 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -6143,7 +6143,8 @@ static bool may_update_sockmap(struct bpf_verifier_env *env, int func_id)
 
 static bool allow_tail_call_in_subprogs(struct bpf_verifier_env *env)
 {
-	return env->prog->jit_requested && IS_ENABLED(CONFIG_X86_64);
+	return env->prog->jit_requested &&
+	       bpf_jit_supports_subprog_tailcalls();
 }
 
 static int check_map_func_compatibility(struct bpf_verifier_env *env,
-- 
2.35.1