linux-kernel - [PATCH v5 tip/perf/core 1/2] uprobes: simplify find_active_uprobe

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Message-ID: <20241122035922.3321100-2-andrii@kernel.org>
Date: Thu, 21 Nov 2024 19:59:21 -0800
From: Andrii Nakryiko <andrii@...nel.org>
To: linux-trace-kernel@...r.kernel.org,
	linux-mm@...ck.org,
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	Andrii Nakryiko <andrii@...nel.org>
Subject: [PATCH v5 tip/perf/core 1/2] uprobes: simplify find_active_uprobe_rcu() VMA checks

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.

Reviewed-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Acked-by: Oleg Nesterov <oleg@...hat.com>
Suggested-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
---
 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 a76ddc5fc982..c4da8f741f3a 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -2305,7 +2305,7 @@ 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);
 
-- 
2.43.5