From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-173.mta1.migadu.com (out-173.mta1.migadu.com [95.215.58.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 142BE15E97 for ; Mon, 8 Sep 2025 14:37:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757342242; cv=none; b=qb3RSqrDObIJo1ONsu+Q0gZhZ0aYilhWfCZfxawHV5umQw2SN4FFPXd0guDRgk0CeI/TAX8vi2oxJEJpCTeduEua1w6EzMBps+wXC2ljM0hFwYLLeh9OMIlYjrMkJZmLHGNrZMc/hXRNqKlczVHDNxkqMuuNQ8mwuMx+pVSpa+c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757342242; c=relaxed/simple; bh=KSw2Oq8HNwwhZjcLAvI679lL9umQxB3l+ZH/ZVAYAjc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hvH7WPNvdtkC7TrRywA3t+Q3d0bGIwlqb7lAD4044cvkmB7CTLPFItDvyepeDwPmcblTKiCHU3BZMWzdfZ4lcdajLW9gASou+0S2r50WsMiDANswSHiNiaxSDEgd92J2GlyophKzhhEYttOCOiR8lyayLlWTbEuYN2+IVMo3Ckk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=GEJW0vO0; arc=none smtp.client-ip=95.215.58.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="GEJW0vO0" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1757342238; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=z6gynNllnI50yA224Ve3if0/cQgyeUjrCIIO1+X9CjE=; b=GEJW0vO0zC7iFpntdbVyRflHs9T0TENbRDe/ziiVi6+0K0//buHSk2ydyyXhmv01aHQxnP Pf+bLh1gktCmtg4f3NBRw/1QG6xLUvh4NtGTrVMaG+y1FTAFv0G6YR4U/54iuQazFE+ie2 7b24sh+4rCQgWJvgHAu57dfGC8bjEnI= From: Leon Hwang To: bpf@vger.kernel.org Cc: ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, jolsa@kernel.org, yonghong.song@linux.dev, song@kernel.org, eddyz87@gmail.com, dxu@dxuuu.xyz, deso@posteo.net, leon.hwang@linux.dev, kernel-patches-bot@fb.com Subject: [PATCH bpf-next v5 2/9] bpf: Introduce internal bpf_map_check_op_flags helper function Date: Mon, 8 Sep 2025 22:36:37 +0800 Message-ID: <20250908143644.30993-3-leon.hwang@linux.dev> In-Reply-To: <20250908143644.30993-1-leon.hwang@linux.dev> References: <20250908143644.30993-1-leon.hwang@linux.dev> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT It is to unify map flags checking for lookup_elem, update_elem, lookup_batch and update_batch APIs. Therefore, it will be convenient to check BPF_F_CPU and BPF_F_ALL_CPUS flags in it for these APIs in next patch. Signed-off-by: Leon Hwang --- include/linux/bpf.h | 31 +++++++++++++++++++++++++++++++ kernel/bpf/syscall.c | 34 +++++++++++----------------------- 2 files changed, 42 insertions(+), 23 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index ce523a49dc20c..55c98c7d52510 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -3735,4 +3735,35 @@ int bpf_prog_get_file_line(struct bpf_prog *prog, unsigned long ip, const char * const char **linep, int *nump); struct bpf_prog *bpf_prog_find_from_stack(void); +static inline int bpf_map_check_op_flags(struct bpf_map *map, u64 flags, u64 allowed_flags) +{ + if (flags & ~allowed_flags) + return -EINVAL; + + if ((flags & BPF_F_LOCK) && !btf_record_has_field(map->record, BPF_SPIN_LOCK)) + return -EINVAL; + + return 0; +} + +static inline int bpf_map_check_lookup_flags(struct bpf_map *map, u64 flags) +{ + return bpf_map_check_op_flags(map, flags, BPF_F_LOCK); +} + +static inline int bpf_map_check_update_flags(struct bpf_map *map, u64 flags) +{ + return bpf_map_check_op_flags(map, flags, ~0); +} + +static inline int bpf_map_check_lookup_batch_flags(struct bpf_map *map, u64 flags) +{ + return bpf_map_check_lookup_flags(map, flags); +} + +static inline int bpf_map_check_update_batch_flags(struct bpf_map *map, u64 flags) +{ + return bpf_map_check_op_flags(map, flags, BPF_F_LOCK); +} + #endif /* _LINUX_BPF_H */ diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 0fbfa8532c392..3a51836f18915 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -1669,9 +1669,6 @@ static int map_lookup_elem(union bpf_attr *attr) if (CHECK_ATTR(BPF_MAP_LOOKUP_ELEM)) return -EINVAL; - if (attr->flags & ~BPF_F_LOCK) - return -EINVAL; - CLASS(fd, f)(attr->map_fd); map = __bpf_map_get(f); if (IS_ERR(map)) @@ -1679,9 +1676,9 @@ static int map_lookup_elem(union bpf_attr *attr) if (!(map_get_sys_perms(map, f) & FMODE_CAN_READ)) return -EPERM; - if ((attr->flags & BPF_F_LOCK) && - !btf_record_has_field(map->record, BPF_SPIN_LOCK)) - return -EINVAL; + err = bpf_map_check_lookup_flags(map, attr->flags); + if (err) + return err; key = __bpf_copy_key(ukey, map->key_size); if (IS_ERR(key)) @@ -1744,11 +1741,9 @@ static int map_update_elem(union bpf_attr *attr, bpfptr_t uattr) goto err_put; } - if ((attr->flags & BPF_F_LOCK) && - !btf_record_has_field(map->record, BPF_SPIN_LOCK)) { - err = -EINVAL; + err = bpf_map_check_update_flags(map, attr->flags); + if (err) goto err_put; - } key = ___bpf_copy_key(ukey, map->key_size); if (IS_ERR(key)) { @@ -1952,13 +1947,9 @@ int generic_map_update_batch(struct bpf_map *map, struct file *map_file, void *key, *value; int err = 0; - if (attr->batch.elem_flags & ~BPF_F_LOCK) - return -EINVAL; - - if ((attr->batch.elem_flags & BPF_F_LOCK) && - !btf_record_has_field(map->record, BPF_SPIN_LOCK)) { - return -EINVAL; - } + err = bpf_map_check_update_batch_flags(map, attr->batch.elem_flags); + if (err) + return err; value_size = bpf_map_value_size(map); @@ -2015,12 +2006,9 @@ int generic_map_lookup_batch(struct bpf_map *map, u32 value_size, cp, max_count; int err; - if (attr->batch.elem_flags & ~BPF_F_LOCK) - return -EINVAL; - - if ((attr->batch.elem_flags & BPF_F_LOCK) && - !btf_record_has_field(map->record, BPF_SPIN_LOCK)) - return -EINVAL; + err = bpf_map_check_lookup_batch_flags(map, attr->batch.elem_flags); + if (err) + return err; value_size = bpf_map_value_size(map); -- 2.50.1