[PATCH bpf-next] bpf: Change bpf_session_cookie return value to __u64 *

[PATCH bpf-next] bpf: Change bpf_session_cookie return value to __u64 *

[Jiri Olsa]

This reverts [1] and changes return value for bpf_session_cookie
in bpf selftests. Having long * might lead to problems on 32-bit
architectures.

Fixes: 2b8dd87332cd ("bpf: Make bpf_session_cookie() kfunc return long *")
Suggested-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 kernel/trace/bpf_trace.c                                        | 2 +-
 tools/testing/selftests/bpf/bpf_kfuncs.h                        | 2 +-
 tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 4b3fda456299..cd098846e251 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -3530,7 +3530,7 @@ __bpf_kfunc bool bpf_session_is_return(void)
 	return session_ctx->is_return;
 }
 
-__bpf_kfunc long *bpf_session_cookie(void)
+__bpf_kfunc __u64 *bpf_session_cookie(void)
 {
 	struct bpf_session_run_ctx *session_ctx;
 
diff --git a/tools/testing/selftests/bpf/bpf_kfuncs.h b/tools/testing/selftests/bpf/bpf_kfuncs.h
index be91a6919315..3b6675ab4086 100644
--- a/tools/testing/selftests/bpf/bpf_kfuncs.h
+++ b/tools/testing/selftests/bpf/bpf_kfuncs.h
@@ -77,5 +77,5 @@ extern int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_ptr,
 				      struct bpf_key *trusted_keyring) __ksym;
 
 extern bool bpf_session_is_return(void) __ksym __weak;
-extern long *bpf_session_cookie(void) __ksym __weak;
+extern __u64 *bpf_session_cookie(void) __ksym __weak;
 #endif
diff --git a/tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c b/tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c
index d49070803e22..0835b5edf685 100644
--- a/tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c
+++ b/tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c
@@ -25,7 +25,7 @@ int BPF_PROG(trigger)
 
 static int check_cookie(__u64 val, __u64 *result)
 {
-	long *cookie;
+	__u64 *cookie;
 
 	if (bpf_get_current_pid_tgid() >> 32 != pid)
 		return 1;
-- 
2.45.2

Re: [PATCH bpf-next] bpf: Change bpf_session_cookie return value to __u64 *

[Andrii Nakryiko]

On Wed, Jun 19, 2024 at 1:16 AM Jiri Olsa <jolsa@kernel.org> wrote:
>
> This reverts [1] and changes return value for bpf_session_cookie
> in bpf selftests. Having long * might lead to problems on 32-bit
> architectures.
>
> Fixes: 2b8dd87332cd ("bpf: Make bpf_session_cookie() kfunc return long *")
> Suggested-by: Andrii Nakryiko <andrii@kernel.org>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
>  kernel/trace/bpf_trace.c                                        | 2 +-
>  tools/testing/selftests/bpf/bpf_kfuncs.h                        | 2 +-
>  tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
>

LGTM, thanks for the follow up!

Acked-by: Andrii Nakryiko <andrii@kernel.org>

> diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
> index 4b3fda456299..cd098846e251 100644
> --- a/kernel/trace/bpf_trace.c
> +++ b/kernel/trace/bpf_trace.c
> @@ -3530,7 +3530,7 @@ __bpf_kfunc bool bpf_session_is_return(void)
>         return session_ctx->is_return;
>  }
>
> -__bpf_kfunc long *bpf_session_cookie(void)
> +__bpf_kfunc __u64 *bpf_session_cookie(void)
>  {
>         struct bpf_session_run_ctx *session_ctx;
>
> diff --git a/tools/testing/selftests/bpf/bpf_kfuncs.h b/tools/testing/selftests/bpf/bpf_kfuncs.h
> index be91a6919315..3b6675ab4086 100644
> --- a/tools/testing/selftests/bpf/bpf_kfuncs.h
> +++ b/tools/testing/selftests/bpf/bpf_kfuncs.h
> @@ -77,5 +77,5 @@ extern int bpf_verify_pkcs7_signature(struct bpf_dynptr *data_ptr,
>                                       struct bpf_key *trusted_keyring) __ksym;
>
>  extern bool bpf_session_is_return(void) __ksym __weak;
> -extern long *bpf_session_cookie(void) __ksym __weak;
> +extern __u64 *bpf_session_cookie(void) __ksym __weak;
>  #endif
> diff --git a/tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c b/tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c
> index d49070803e22..0835b5edf685 100644
> --- a/tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c
> +++ b/tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c
> @@ -25,7 +25,7 @@ int BPF_PROG(trigger)
>
>  static int check_cookie(__u64 val, __u64 *result)
>  {
> -       long *cookie;
> +       __u64 *cookie;
>
>         if (bpf_get_current_pid_tgid() >> 32 != pid)
>                 return 1;
> --
> 2.45.2
>

Re: [PATCH bpf-next] bpf: Change bpf_session_cookie return value to __u64 *

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@iogearbox.net>:

On Wed, 19 Jun 2024 10:16:24 +0200 you wrote:
> This reverts [1] and changes return value for bpf_session_cookie
> in bpf selftests. Having long * might lead to problems on 32-bit
> architectures.
> 
> Fixes: 2b8dd87332cd ("bpf: Make bpf_session_cookie() kfunc return long *")
> Suggested-by: Andrii Nakryiko <andrii@kernel.org>
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> 
> [...]

Here is the summary with links:
  - [bpf-next] bpf: Change bpf_session_cookie return value to __u64 *
    https://git.kernel.org/bpf/bpf-next/c/717d6313bba1

You are awesome, thank you!
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