From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 8650C14658A for ; Tue, 4 Jun 2024 12:26:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717503984; cv=none; b=rmM0qjgxL6O7J6eE28laAqERLJ31MUtnrCdIeXUm+ylPq1NZDRPaMUyaHIbzskedsIMm9AwS1aUmHoSrSBpJRnUbsr9sLVy9ngRU2DtyFlRuTbPmg7Ky5J4YbFUv5Wi+K2nI8ubbQxBRVlyBkMqf9BVCzf6NVKebr04awUYrOjo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717503984; c=relaxed/simple; bh=7TloC/YZDDY1Iat+MWMKEijUu24a/+pzrNxIBZo32Ls=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pavoaASsPNRGNLVtg9z2xRjSinnYBr9tCsA1pSPtEzIMrlVOlNQd1nXefIkSpV16sAzpaimcdJ77UqJXxuxiBz6XUNhnG4RfsHDeYFTjhc+CbAfxocxKKoFbn36PFDCnybsp8I/XocUndLKYUDtup6uxdNePqfur3wJTZXMLEk8= 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=h5HHt4Aw; arc=none smtp.client-ip=170.10.129.124 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="h5HHt4Aw" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1717503981; 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=aXfKzgnS1a7dNjnPxPlU/qmVEHFMnEf3bxdZwelxxd0=; b=h5HHt4Aw3F2ABHkrkl0/Di0CA0zmuNFeaWWGOyv/bzkUuMzchZGue4fKPaVOCZm8Ya8jTB 5F51ZT5HgGE2MajDBRaB/IqD4KoSltm888qVhzBKBAeOUxOczw87HCzaDNCBTfvG+xFdcx hl+zK28xw4/ksw0lJJ0FecFDb5Ic0e4= Received: from mx-prod-mc-02.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-121-ODGmKQOXNA-4YSKHFzPAow-1; Tue, 04 Jun 2024 08:26:14 -0400 X-MC-Unique: ODGmKQOXNA-4YSKHFzPAow-1 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (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-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E85DF18BF6E4; Tue, 4 Jun 2024 12:26:10 +0000 (UTC) Received: from t14s.redhat.com (unknown [10.39.193.118]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 1B8851955D8B; Tue, 4 Jun 2024 12:26:04 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, David Hildenbrand , Andrew Morton , Guillaume Morin , Russell King , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" Subject: [PATCH RFC 2/3] kernel/events/uprobes: pass VMA to set_swbp(), set_orig_insn() and uprobe_write_opcode() Date: Tue, 4 Jun 2024 14:25:47 +0200 Message-ID: <20240604122548.359952-3-david@redhat.com> In-Reply-To: <20240604122548.359952-1-david@redhat.com> References: <20240604122548.359952-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 We already have the VMA, no need to look it up using get_user_page_vma_remote(). We can now switch to get_user_pages_remote(). Signed-off-by: David Hildenbrand --- arch/arm/probes/uprobes/core.c | 4 ++-- include/linux/uprobes.h | 6 +++--- kernel/events/uprobes.c | 33 +++++++++++++++++---------------- 3 files changed, 22 insertions(+), 21 deletions(-) diff --git a/arch/arm/probes/uprobes/core.c b/arch/arm/probes/uprobes/core.c index f5f790c6e5f89..885e0c5e8c20d 100644 --- a/arch/arm/probes/uprobes/core.c +++ b/arch/arm/probes/uprobes/core.c @@ -26,10 +26,10 @@ bool is_swbp_insn(uprobe_opcode_t *insn) (UPROBE_SWBP_ARM_INSN & 0x0fffffff); } -int set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, +int set_swbp(struct arch_uprobe *auprobe, struct vm_area_struct *vma, unsigned long vaddr) { - return uprobe_write_opcode(auprobe, mm, vaddr, + return uprobe_write_opcode(auprobe, vma, vaddr, __opcode_to_mem_arm(auprobe->bpinsn)); } diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h index f46e0ca0169c7..77580dba6f8de 100644 --- a/include/linux/uprobes.h +++ b/include/linux/uprobes.h @@ -103,13 +103,13 @@ struct uprobes_state { }; extern void __init uprobes_init(void); -extern int set_swbp(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr); -extern int set_orig_insn(struct arch_uprobe *aup, struct mm_struct *mm, unsigned long vaddr); +extern int set_swbp(struct arch_uprobe *aup, struct vm_area_struct *vma, unsigned long vaddr); +extern int set_orig_insn(struct arch_uprobe *aup, struct vm_area_struct *vma, unsigned long vaddr); extern bool is_swbp_insn(uprobe_opcode_t *insn); 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_write_opcode(struct arch_uprobe *auprobe, struct vm_area_struct *vma, unsigned long vaddr, uprobe_opcode_t); extern int uprobe_register(struct inode *inode, loff_t offset, struct uprobe_consumer *uc); extern int uprobe_register_refctr(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); diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index c6d6b7a8e4410..f2b1fef7f1d62 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -449,19 +449,19 @@ static int update_ref_ctr(struct uprobe *uprobe, struct mm_struct *mm, * * uprobe_write_opcode - write the opcode at a given virtual address. * @auprobe: arch specific probepoint information. - * @mm: the probed process address space. + * @vma: the probed virtual memory area. * @vaddr: the virtual address to store the opcode. * @opcode: opcode to be written at @vaddr. * * Called with mm->mmap_lock held for write. * Return 0 (success) or a negative errno. */ -int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, - unsigned long vaddr, uprobe_opcode_t opcode) +int uprobe_write_opcode(struct arch_uprobe *auprobe, struct vm_area_struct *vma, + unsigned long vaddr, uprobe_opcode_t opcode) { + struct mm_struct *mm = vma->vm_mm; struct uprobe *uprobe; struct page *old_page, *new_page; - struct vm_area_struct *vma; int ret, is_register, ref_ctr_updated = 0; bool orig_page_huge = false; unsigned int gup_flags = FOLL_FORCE; @@ -473,9 +473,9 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, if (is_register) gup_flags |= FOLL_SPLIT_PMD; /* Read the page with vaddr into memory */ - old_page = get_user_page_vma_remote(mm, vaddr, gup_flags, &vma); - if (IS_ERR(old_page)) - return PTR_ERR(old_page); + ret = get_user_pages_remote(mm, vaddr, 1, gup_flags, &old_page, NULL); + if (ret != 1) + return ret; ret = verify_opcode(old_page, vaddr, &opcode); if (ret <= 0) @@ -560,30 +560,31 @@ int uprobe_write_opcode(struct arch_uprobe *auprobe, struct mm_struct *mm, /** * set_swbp - store breakpoint at a given address. * @auprobe: arch specific probepoint information. - * @mm: the probed process address space. + * @vma: the probed virtual memory area. * @vaddr: the virtual address to insert the opcode. * * For mm @mm, store the breakpoint instruction at @vaddr. * Return 0 (success) or a negative errno. */ -int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr) +int __weak set_swbp(struct arch_uprobe *auprobe, struct vm_area_struct *vma, + unsigned long vaddr) { - return uprobe_write_opcode(auprobe, mm, vaddr, UPROBE_SWBP_INSN); + return uprobe_write_opcode(auprobe, vma, vaddr, UPROBE_SWBP_INSN); } /** * set_orig_insn - Restore the original instruction. - * @mm: the probed process address space. + * @vma: the probed virtual memory area. * @auprobe: arch specific probepoint information. * @vaddr: the virtual address to insert the opcode. * * For mm @mm, restore the original opcode (opcode) at @vaddr. * Return 0 (success) or a negative errno. */ -int __weak -set_orig_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long vaddr) +int __weak set_orig_insn(struct arch_uprobe *auprobe, + struct vm_area_struct *vma, unsigned long vaddr) { - return uprobe_write_opcode(auprobe, mm, vaddr, + return uprobe_write_opcode(auprobe, vma, vaddr, *(uprobe_opcode_t *)&auprobe->insn); } @@ -905,7 +906,7 @@ static int install_breakpoint(struct uprobe *uprobe, struct vm_area_struct *vma, if (first_uprobe) set_bit(MMF_HAS_UPROBES, &mm->flags); - ret = set_swbp(&uprobe->arch, mm, vaddr); + ret = set_swbp(&uprobe->arch, vma, vaddr); if (!ret) clear_bit(MMF_RECALC_UPROBES, &mm->flags); else if (first_uprobe) @@ -920,7 +921,7 @@ static int remove_breakpoint(struct uprobe *uprobe, struct vm_area_struct *vma, struct mm_struct *mm = vma->vm_mm; set_bit(MMF_RECALC_UPROBES, &mm->flags); - return set_orig_insn(&uprobe->arch, mm, vaddr); + return set_orig_insn(&uprobe->arch, vma, vaddr); } static inline bool uprobe_is_active(struct uprobe *uprobe) -- 2.45.1