From patchwork Mon Oct 28 01:08:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 13852770 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 3A96813774D; Mon, 28 Oct 2024 01:09:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730077756; cv=none; b=j6enUoQK9H9/JtfjkXqrYkdOmKmmBsaijjRWkyYVsA+6RNQsGuIlYNmyMCoi+jgbTegILSUuoNxeVDw/fZxdNGbR+BUfMmrFxDG/e2ikBxnEr3hSn71clk6ZHCMEFAzc1QnTTd3nj+XqtBcEKw7yoPl4J/xG+YncriQOcd9+XFU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730077756; c=relaxed/simple; bh=d0t2KdzFB54YqijRSkN8zgCUkKArImLR1/o5M57T+Y4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=H+wS2PZC5m2f6aebL9t0Le2ItNtN47Lm19IMVYA/Ee+M7YY1G02TagxQmNiZYz3NawcG9LT3uucNrpI0E1pMt2Nqe2b4D6PQ8l3tLCyfuI6JXq/96ibuOjxlrEVPM0uVaC9KBeRW7ZqY6SqBi006ymUPKEdoCy/QG129HgEZDHk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hHZTZEzL; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hHZTZEzL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B52B2C4CEC3; Mon, 28 Oct 2024 01:09:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730077755; bh=d0t2KdzFB54YqijRSkN8zgCUkKArImLR1/o5M57T+Y4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hHZTZEzLr1iL3FHbaDuT4QMbEbbJCKfdJHak1Cphw3Io7OVy4N+9xviZFpn66aI1f PlJOkge1nFNeUdTsUnrOMPN1hqSeV1o0gMm9Lg/U2BhrunABIRUiRijxF0F2+CkU8d v58avLtFpLU/wQJTBPSWS4XGJpq96/WS8igjo7MUUUodF4yAQ3kroN4bJHsKngkHlT l8xJpHr70NPY6NK78bXQv05YYUiquo6oYCTtSTdJKylBEBOTHst9WNjrRy8s45NIDO bgUj7V6k42jCxv/1X9EWh7uooH0Cih40WwIP7W2TzNwQMR6cvih5Yu9jll42E3zSyv TwSiGKYcMRJ4g== From: Andrii Nakryiko To: linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, peterz@infradead.org Cc: oleg@redhat.com, rostedt@goodmis.org, mhiramat@kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, jolsa@kernel.org, paulmck@kernel.org, willy@infradead.org, surenb@google.com, mjguzik@gmail.com, brauner@kernel.org, jannh@google.com, mhocko@kernel.org, vbabka@suse.cz, shakeel.butt@linux.dev, hannes@cmpxchg.org, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, david@redhat.com, arnd@arndb.de, richard.weiyang@gmail.com, zhangpeng.00@bytedance.com, linmiaohe@huawei.com, viro@zeniv.linux.org.uk, hca@linux.ibm.com, Andrii Nakryiko Subject: [PATCH v4 tip/perf/core 3/4] uprobes: simplify find_active_uprobe_rcu() VMA checks Date: Sun, 27 Oct 2024 18:08:17 -0700 Message-ID: <20241028010818.2487581-4-andrii@kernel.org> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241028010818.2487581-1-andrii@kernel.org> References: <20241028010818.2487581-1-andrii@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 At the point where find_active_uprobe_rcu() is used we know that VMA in question has triggered software breakpoint, so we don't need to validate vma->vm_flags. Keep only vma->vm_file NULL check. Acked-by: Oleg Nesterov Suggested-by: Oleg Nesterov Signed-off-by: Andrii Nakryiko Reviewed-by: Masami Hiramatsu (Google) --- kernel/events/uprobes.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 4ef4b51776eb..290c445768fa 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -2084,7 +2084,7 @@ static struct uprobe *find_active_uprobe_rcu(unsigned long bp_vaddr, int *is_swb mmap_read_lock(mm); vma = vma_lookup(mm, bp_vaddr); if (vma) { - if (valid_vma(vma, false)) { + if (vma->vm_file) { struct inode *inode = file_inode(vma->vm_file); loff_t offset = vaddr_to_offset(vma, bp_vaddr);