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Fri, 23 Jan 2026 22:20:47 -0800 (PST) From: Menglong Dong X-Google-Original-From: Menglong Dong To: andrii@kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, davem@davemloft.net, dsahern@kernel.org, tglx@linutronix.de, mingo@redhat.com, jiang.biao@linux.dev, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next v13 03/13] bpf: change prototype of bpf_session_{cookie,is_return} Date: Sat, 24 Jan 2026 14:19:58 +0800 Message-ID: <20260124062008.8657-4-dongml2@chinatelecom.cn> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260124062008.8657-1-dongml2@chinatelecom.cn> References: <20260124062008.8657-1-dongml2@chinatelecom.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add the function argument of "void *ctx" to bpf_session_cookie() and bpf_session_is_return(), which is a preparation of the next patch. The two kfunc is seldom used now, so it will not introduce much effect to change their function prototype. Signed-off-by: Menglong Dong Acked-by: Andrii Nakryiko --- v10: - drop the declaration of bpf_session_is_return() and bpf_session_cookie() --- kernel/bpf/verifier.c | 6 +++++- kernel/trace/bpf_trace.c | 4 ++-- tools/testing/selftests/bpf/bpf_kfuncs.h | 3 --- .../bpf/progs/kprobe_multi_session_cookie.c | 15 +++++++-------- .../selftests/bpf/progs/uprobe_multi_session.c | 7 +++---- .../bpf/progs/uprobe_multi_session_cookie.c | 15 +++++++-------- .../bpf/progs/uprobe_multi_session_recursive.c | 11 +++++------ 7 files changed, 29 insertions(+), 32 deletions(-) diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 2081343a848d..0fa73d56cb8b 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -12484,6 +12484,7 @@ enum special_kfunc_type { KF_bpf_arena_alloc_pages, KF_bpf_arena_free_pages, KF_bpf_arena_reserve_pages, + KF_bpf_session_is_return, }; =20 BTF_ID_LIST(special_kfunc_list) @@ -12561,6 +12562,7 @@ BTF_ID(func, bpf_task_work_schedule_resume) BTF_ID(func, bpf_arena_alloc_pages) BTF_ID(func, bpf_arena_free_pages) BTF_ID(func, bpf_arena_reserve_pages) +BTF_ID(func, bpf_session_is_return) =20 static bool is_task_work_add_kfunc(u32 func_id) { @@ -12615,7 +12617,9 @@ get_kfunc_ptr_arg_type(struct bpf_verifier_env *env, struct bpf_reg_state *reg =3D ®s[regno]; bool arg_mem_size =3D false; =20 - if (meta->func_id =3D=3D special_kfunc_list[KF_bpf_cast_to_kern_ctx]) + if (meta->func_id =3D=3D special_kfunc_list[KF_bpf_cast_to_kern_ctx] || + meta->func_id =3D=3D special_kfunc_list[KF_bpf_session_is_return] || + meta->func_id =3D=3D special_kfunc_list[KF_bpf_session_cookie]) return KF_ARG_PTR_TO_CTX; =20 if (argno + 1 < nargs && diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index d466a1503da3..13f0a2de33b7 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -3323,7 +3323,7 @@ static u64 bpf_uprobe_multi_entry_ip(struct bpf_run_c= tx *ctx) =20 __bpf_kfunc_start_defs(); =20 -__bpf_kfunc bool bpf_session_is_return(void) +__bpf_kfunc bool bpf_session_is_return(void *ctx) { struct bpf_session_run_ctx *session_ctx; =20 @@ -3331,7 +3331,7 @@ __bpf_kfunc bool bpf_session_is_return(void) return session_ctx->is_return; } =20 -__bpf_kfunc __u64 *bpf_session_cookie(void) +__bpf_kfunc __u64 *bpf_session_cookie(void *ctx) { struct bpf_session_run_ctx *session_ctx; =20 diff --git a/tools/testing/selftests/bpf/bpf_kfuncs.h b/tools/testing/selft= ests/bpf/bpf_kfuncs.h index e0189254bb6e..7dad01439391 100644 --- a/tools/testing/selftests/bpf/bpf_kfuncs.h +++ b/tools/testing/selftests/bpf/bpf_kfuncs.h @@ -79,9 +79,6 @@ extern int bpf_verify_pkcs7_signature(struct bpf_dynptr *= data_ptr, struct bpf_dynptr *sig_ptr, struct bpf_key *trusted_keyring) __ksym; =20 -extern bool bpf_session_is_return(void) __ksym __weak; -extern __u64 *bpf_session_cookie(void) __ksym __weak; - struct dentry; /* Description * Returns xattr of a dentry 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 0835b5edf685..ad627016e3e5 100644 --- a/tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c +++ b/tools/testing/selftests/bpf/progs/kprobe_multi_session_cookie.c @@ -1,9 +1,8 @@ // SPDX-License-Identifier: GPL-2.0 -#include +#include #include #include #include -#include "bpf_kfuncs.h" =20 char _license[] SEC("license") =3D "GPL"; =20 @@ -23,16 +22,16 @@ int BPF_PROG(trigger) return 0; } =20 -static int check_cookie(__u64 val, __u64 *result) +static int check_cookie(struct pt_regs *ctx, __u64 val, __u64 *result) { __u64 *cookie; =20 if (bpf_get_current_pid_tgid() >> 32 !=3D pid) return 1; =20 - cookie =3D bpf_session_cookie(); + cookie =3D bpf_session_cookie(ctx); =20 - if (bpf_session_is_return()) + if (bpf_session_is_return(ctx)) *result =3D *cookie =3D=3D val ? val : 0; else *cookie =3D val; @@ -42,17 +41,17 @@ static int check_cookie(__u64 val, __u64 *result) SEC("kprobe.session/bpf_fentry_test1") int test_kprobe_1(struct pt_regs *ctx) { - return check_cookie(1, &test_kprobe_1_result); + return check_cookie(ctx, 1, &test_kprobe_1_result); } =20 SEC("kprobe.session/bpf_fentry_test1") int test_kprobe_2(struct pt_regs *ctx) { - return check_cookie(2, &test_kprobe_2_result); + return check_cookie(ctx, 2, &test_kprobe_2_result); } =20 SEC("kprobe.session/bpf_fentry_test1") int test_kprobe_3(struct pt_regs *ctx) { - return check_cookie(3, &test_kprobe_3_result); + return check_cookie(ctx, 3, &test_kprobe_3_result); } diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_session.c b/too= ls/testing/selftests/bpf/progs/uprobe_multi_session.c index 30bff90b68dc..6e46bb00ff58 100644 --- a/tools/testing/selftests/bpf/progs/uprobe_multi_session.c +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_session.c @@ -1,9 +1,8 @@ // SPDX-License-Identifier: GPL-2.0 -#include +#include #include #include #include -#include "bpf_kfuncs.h" #include "bpf_misc.h" =20 char _license[] SEC("license") =3D "GPL"; @@ -51,7 +50,7 @@ static int uprobe_multi_check(void *ctx, bool is_return) SEC("uprobe.session//proc/self/exe:uprobe_multi_func_*") int uprobe(struct pt_regs *ctx) { - return uprobe_multi_check(ctx, bpf_session_is_return()); + return uprobe_multi_check(ctx, bpf_session_is_return(ctx)); } =20 static __always_inline bool verify_sleepable_user_copy(void) @@ -67,5 +66,5 @@ int uprobe_sleepable(struct pt_regs *ctx) { if (verify_sleepable_user_copy()) uprobe_multi_sleep_result++; - return uprobe_multi_check(ctx, bpf_session_is_return()); + return uprobe_multi_check(ctx, bpf_session_is_return(ctx)); } diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.= c b/tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c index 5befdf944dc6..b5db196614a9 100644 --- a/tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_session_cookie.c @@ -1,9 +1,8 @@ // SPDX-License-Identifier: GPL-2.0 -#include +#include #include #include #include -#include "bpf_kfuncs.h" =20 char _license[] SEC("license") =3D "GPL"; =20 @@ -13,16 +12,16 @@ __u64 test_uprobe_1_result =3D 0; __u64 test_uprobe_2_result =3D 0; __u64 test_uprobe_3_result =3D 0; =20 -static int check_cookie(__u64 val, __u64 *result) +static int check_cookie(struct pt_regs *ctx, __u64 val, __u64 *result) { __u64 *cookie; =20 if (bpf_get_current_pid_tgid() >> 32 !=3D pid) return 1; =20 - cookie =3D bpf_session_cookie(); + cookie =3D bpf_session_cookie(ctx); =20 - if (bpf_session_is_return()) + if (bpf_session_is_return(ctx)) *result =3D *cookie =3D=3D val ? val : 0; else *cookie =3D val; @@ -32,17 +31,17 @@ static int check_cookie(__u64 val, __u64 *result) SEC("uprobe.session//proc/self/exe:uprobe_multi_func_1") int uprobe_1(struct pt_regs *ctx) { - return check_cookie(1, &test_uprobe_1_result); + return check_cookie(ctx, 1, &test_uprobe_1_result); } =20 SEC("uprobe.session//proc/self/exe:uprobe_multi_func_2") int uprobe_2(struct pt_regs *ctx) { - return check_cookie(2, &test_uprobe_2_result); + return check_cookie(ctx, 2, &test_uprobe_2_result); } =20 SEC("uprobe.session//proc/self/exe:uprobe_multi_func_3") int uprobe_3(struct pt_regs *ctx) { - return check_cookie(3, &test_uprobe_3_result); + return check_cookie(ctx, 3, &test_uprobe_3_result); } diff --git a/tools/testing/selftests/bpf/progs/uprobe_multi_session_recursi= ve.c b/tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c index 8fbcd69fae22..3ce309248a04 100644 --- a/tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c +++ b/tools/testing/selftests/bpf/progs/uprobe_multi_session_recursive.c @@ -1,9 +1,8 @@ // SPDX-License-Identifier: GPL-2.0 -#include +#include #include #include #include -#include "bpf_kfuncs.h" #include "bpf_misc.h" =20 char _license[] SEC("license") =3D "GPL"; @@ -16,11 +15,11 @@ int idx_return =3D 0; __u64 test_uprobe_cookie_entry[6]; __u64 test_uprobe_cookie_return[3]; =20 -static int check_cookie(void) +static int check_cookie(struct pt_regs *ctx) { - __u64 *cookie =3D bpf_session_cookie(); + __u64 *cookie =3D bpf_session_cookie(ctx); =20 - if (bpf_session_is_return()) { + if (bpf_session_is_return(ctx)) { if (idx_return >=3D ARRAY_SIZE(test_uprobe_cookie_return)) return 1; test_uprobe_cookie_return[idx_return++] =3D *cookie; @@ -40,5 +39,5 @@ int uprobe_recursive(struct pt_regs *ctx) if (bpf_get_current_pid_tgid() >> 32 !=3D pid) return 1; =20 - return check_cookie(); + return check_cookie(ctx); } --=20 2.52.0