From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 69FEB1953BB for ; Wed, 10 Jul 2024 16:33:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720629204; cv=none; b=ohZZizvUOaRbPDgKmzFLtIVJczNccdtmF2jwVgEF/M/LNdUmS6Fsm6obZLBt33ZwcV5ZiQ2mGXxKm36+/Uf4FWZREOLauc872XS1cVHHQ1fBrboTT4WI9TAHpvvNLEQqRuEk9WOkYCECe1ZD5FLIwIcji6yBOJXC246TRslzZXA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720629204; c=relaxed/simple; bh=xSn6aWn2VSQKHTpQ2P/SzpL4K8+RF4WT6iLKwi2Jo88=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=JZ1yY3KtS5bWy2CHPkM+A2wL4qMRLktCX6z71ZIpLxydGYMasSsJI/m3wAEzO31Vqmdy/qWmZuuGgaat5+nl1P+jVNRNJ0U49Gkps+T+MI1maRpejmsLGBnpPIIsKBB6m63gz8F8sQknd6c8tz7cj6Zo1ejKmRw6YLanYgP/hO8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=V4hfGr+j; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="V4hfGr+j" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1720629201; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=jbKCCwZUAG8+N7TuFtLLFIVTbn6KobI4S7EYoLAaXBE=; b=V4hfGr+jideQtkqUDVfJ2Of+Pvbuw+U2cnl1XQ4zYS3ANU2ifAiL0kv+lO3kxEDiXVp6+T E0sLL+CKWriCq5kUincHdv95N0AYecgwtPYDdsv1wgUoqXGdHRUaCHLRptU2EMhkNLdhZR 85q9m77v7xkROLwkmswV7BbvtP7t380= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-422-nzynZEw5OtCFZTzOKy9FUw-1; Wed, 10 Jul 2024 12:33:17 -0400 X-MC-Unique: nzynZEw5OtCFZTzOKy9FUw-1 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 1C689196CDEF; Wed, 10 Jul 2024 16:33:15 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.45.224.169]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with SMTP id 3EF321955E70; Wed, 10 Jul 2024 16:33:10 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Wed, 10 Jul 2024 18:31:38 +0200 (CEST) Date: Wed, 10 Jul 2024 18:31:33 +0200 From: Oleg Nesterov To: andrii@kernel.org, mhiramat@kernel.org, peterz@infradead.org Cc: clm@meta.com, jolsa@kernel.org, mingo@kernel.org, paulmck@kernel.org, rostedt@goodmis.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH 3/3] uprobes: make uprobe_register() return struct uprobe * Message-ID: <20240710163133.GD13298@redhat.com> References: <20240710140017.GA1074@redhat.com> <20240710163022.GA13298@redhat.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240710163022.GA13298@redhat.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 This way uprobe_unregister() and uprobe_apply() do not need find_uprobe() + put_uprobe(). And to me this change simplifies the code a bit. Signed-off-by: Oleg Nesterov --- include/linux/uprobes.h | 14 ++++++------ kernel/events/uprobes.c | 45 ++++++++++++------------------------- kernel/trace/bpf_trace.c | 12 +++++----- kernel/trace/trace_uprobe.c | 28 +++++++++++------------ 4 files changed, 41 insertions(+), 58 deletions(-) diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index aa89a8b67039..399509befcf4 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -110,9 +110,9 @@ extern bool is_trap_insn(uprobe_opcode_t *insn); extern unsigned long uprobe_get_swbp_addr(struct pt_regs *regs); extern unsigned long uprobe_get_trap_addr(struct pt_regs *regs); extern int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr, uprobe_opcode_t); -extern int uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc); -extern int uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool); -extern void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); +extern struct uprobe *uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc); +extern int uprobe_apply(struct uprobe *uprobe, struct uprobe_consumer *uc, bool); +extern void uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc); extern int uprobe_mmap(struct vm_area_struct *vma); extern void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end); extern void uprobe_start_dup_mmap(void); @@ -147,18 +147,18 @@ static inline void uprobes_init(void) #define uprobe_get_trap_addr(regs) instruction_pointer(regs) -static inline int +static inline struct uprobe * uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, struct uprobe_consumer *uc) { - return -ENOSYS; + return ERR_PTR(-ENOSYS); } static inline int -uprobe_apply(struct inode *inode, loff_t offset, struct uprobe_consumer *uc, bool add) +uprobe_apply(struct uprobe* uprobe, struct uprobe_consumer *uc, bool add) { return -ENOSYS; } static inline void -uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) +uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc) { } static inline int uprobe_mmap(struct vm_area_struct *vma) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index e5b7c6239970..dba41403d7b8 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1100,22 +1100,15 @@ __uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc) /* * uprobe_unregister - unregister an already registered probe. - * @inode: the file in which the probe has to be removed. + * @uprobe: uprobe to remove * @offset: offset from the start of the file. * @uc: identify which probe if multiple probes are colocated. */ -void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc) +void uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc) { - struct uprobe *uprobe; - - uprobe = find_uprobe(inode, offset); - if (WARN_ON(!uprobe)) - return; - down_write(&uprobe->register_rwsem); __uprobe_unregister(uprobe, uc); up_write(&uprobe->register_rwsem); - put_uprobe(uprobe); } EXPORT_SYMBOL_GPL(uprobe_unregister); @@ -1133,41 +1126,39 @@ EXPORT_SYMBOL_GPL(uprobe_unregister); * refcount is released when the last @uc for the @uprobe * unregisters. Caller of uprobe_register() is required to keep @inode * (and the containing mount) referenced. - * - * Return errno if it cannot successully install probes - * else return 0 (success) */ -int uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, - struct uprobe_consumer *uc) +struct uprobe *uprobe_register(struct inode *inode, + loff_t offset, loff_t ref_ctr_offset, + struct uprobe_consumer *uc) { struct uprobe *uprobe; int ret; /* Uprobe must have at least one set consumer */ if (!uc->handler && !uc->ret_handler) - return -EINVAL; + return ERR_PTR(-EINVAL); /* copy_insn() uses read_mapping_page() or shmem_read_mapping_page() */ if (!inode->i_mapping->a_ops->read_folio && !shmem_mapping(inode->i_mapping)) - return -EIO; + return ERR_PTR(-EIO); /* Racy, just to catch the obvious mistakes */ if (offset > i_size_read(inode)) - return -EINVAL; + return ERR_PTR(-EINVAL); /* * This ensures that copy_from_page(), copy_to_page() and * __update_ref_ctr() can't cross page boundary. */ if (!IS_ALIGNED(offset, UPROBE_SWBP_INSN_SIZE)) - return -EINVAL; + return ERR_PTR(-EINVAL); if (!IS_ALIGNED(ref_ctr_offset, sizeof(short))) - return -EINVAL; + return ERR_PTR(-EINVAL); retry: uprobe = alloc_uprobe(inode, offset, ref_ctr_offset); if (IS_ERR(uprobe)) - return PTR_ERR(uprobe); + return uprobe; /* * We can race with uprobe_unregister()->delete_uprobe(). @@ -1186,35 +1177,27 @@ int uprobe_register(struct inode *inode, loff_t offset, loff_t ref_ctr_offset, if (unlikely(ret == -EAGAIN)) goto retry; - return ret; + + return ret ? ERR_PTR(ret) : uprobe; } EXPORT_SYMBOL_GPL(uprobe_register); /* * uprobe_apply - unregister an already registered probe. - * @inode: the file in which the probe has to be removed. - * @offset: offset from the start of the file. * @uc: consumer which wants to add more or remove some breakpoints * @add: add or remove the breakpoints */ -int uprobe_apply(struct inode *inode, loff_t offset, - struct uprobe_consumer *uc, bool add) +int uprobe_apply(struct uprobe *uprobe, struct uprobe_consumer *uc, bool add) { - struct uprobe *uprobe; struct uprobe_consumer *con; int ret = -ENOENT; - uprobe = find_uprobe(inode, offset); - if (WARN_ON(!uprobe)) - return ret; - down_write(&uprobe->register_rwsem); for (con = uprobe->consumers; con && con != uc ; con = con->next) ; if (con) ret = register_for_each_vma(uprobe, add ? uc : NULL); up_write(&uprobe->register_rwsem); - put_uprobe(uprobe); return ret; } diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 467f358c8ce7..7571811127a2 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -3157,6 +3157,7 @@ struct bpf_uprobe { loff_t offset; unsigned long ref_ctr_offset; u64 cookie; + struct uprobe *uprobe; struct uprobe_consumer consumer; }; @@ -3180,10 +3181,8 @@ static void bpf_uprobe_unregister(struct path *path, struct bpf_uprobe *uprobes, { u32 i; - for (i = 0; i < cnt; i++) { - uprobe_unregister(d_real_inode(path->dentry), uprobes[i].offset, - &uprobes[i].consumer); - } + for (i = 0; i < cnt; i++) + uprobe_unregister(uprobes[i].uprobe, &uprobes[i].consumer); } static void bpf_uprobe_multi_link_release(struct bpf_link *link) @@ -3477,11 +3476,12 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr &bpf_uprobe_multi_link_lops, prog); for (i = 0; i < cnt; i++) { - err = uprobe_register(d_real_inode(link->path.dentry), + uprobes[i].uprobe = uprobe_register(d_real_inode(link->path.dentry), uprobes[i].offset, uprobes[i].ref_ctr_offset, &uprobes[i].consumer); - if (err) { + if (IS_ERR(uprobes[i].uprobe)) { + err = PTR_ERR(uprobes[i].uprobe); bpf_uprobe_unregister(&path, uprobes, i); goto error_free; } diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index 78a5c40e885a..2872955da202 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -58,8 +58,8 @@ struct trace_uprobe { struct dyn_event devent; struct uprobe_consumer consumer; struct path path; - struct inode *inode; char *filename; + struct uprobe *uprobe; unsigned long offset; unsigned long ref_ctr_offset; unsigned long nhit; @@ -1084,17 +1084,17 @@ typedef bool (*filter_func_t)(struct uprobe_consumer *self, static int trace_uprobe_enable(struct trace_uprobe *tu, filter_func_t filter) { - int ret; + struct inode *inode = d_real_inode(tu->path.dentry); + struct uprobe *uprobe; tu->consumer.filter = filter; - tu->inode = d_real_inode(tu->path.dentry); - - ret = uprobe_register(tu->inode, tu->offset, tu->ref_ctr_offset, - &tu->consumer); - if (ret) - tu->inode = NULL; + uprobe = uprobe_register(inode, tu->offset, tu->ref_ctr_offset, + &tu->consumer); + if (IS_ERR(uprobe)) + return PTR_ERR(uprobe); - return ret; + tu->uprobe = uprobe; + return 0; } static void __probe_event_disable(struct trace_probe *tp) @@ -1105,11 +1105,11 @@ static void __probe_event_disable(struct trace_probe *tp) WARN_ON(!uprobe_filter_is_empty(tu->tp.event->filter)); list_for_each_entry(tu, trace_probe_probe_list(tp), tp.list) { - if (!tu->inode) + if (!tu->uprobe) continue; - uprobe_unregister(tu->inode, tu->offset, &tu->consumer); - tu->inode = NULL; + uprobe_unregister(tu->uprobe, &tu->consumer); + tu->uprobe = NULL; } } @@ -1306,7 +1306,7 @@ static int uprobe_perf_close(struct trace_event_call *call, return 0; list_for_each_entry(tu, trace_probe_probe_list(tp), tp.list) { - ret = uprobe_apply(tu->inode, tu->offset, &tu->consumer, false); + ret = uprobe_apply(tu->uprobe, &tu->consumer, false); if (ret) break; } @@ -1330,7 +1330,7 @@ static int uprobe_perf_open(struct trace_event_call *call, return 0; list_for_each_entry(tu, trace_probe_probe_list(tp), tp.list) { - err = uprobe_apply(tu->inode, tu->offset, &tu->consumer, true); + err = uprobe_apply(tu->uprobe, &tu->consumer, true); if (err) { uprobe_perf_close(call, event); break; -- 2.25.1.362.g51ebf55