linux-kernel - [PATCH v2 tip/perf/core 4/5] uprobes: simplify find_active_uprobe

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241001225207.2215639-5-andrii@kernel.org>
Date: Tue,  1 Oct 2024 15:52:06 -0700
From: Andrii Nakryiko <andrii@...nel.org>
To: linux-trace-kernel@...r.kernel.org,
	peterz@...radead.org,
	oleg@...hat.com
Cc: rostedt@...dmis.org,
	mhiramat@...nel.org,
	bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	jolsa@...nel.org,
	paulmck@...nel.org,
	willy@...radead.org,
	surenb@...gle.com,
	akpm@...ux-foundation.org,
	linux-mm@...ck.org,
	mjguzik@...il.com,
	brauner@...nel.org,
	jannh@...gle.com,
	mhocko@...nel.org,
	vbabka@...e.cz,
	mingo@...nel.org,
	Andrii Nakryiko <andrii@...nel.org>
Subject: [PATCH v2 tip/perf/core 4/5] 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.

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 a2e6a57f79f2..7bd9111b4e8b 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -2091,7 +2091,7 @@ 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