diff mbox series

[v3,tip/perf/core,3/4] uprobes: simplify find_active_uprobe_rcu() VMA checks

Message ID 20241010205644.3831427-4-andrii@kernel.org (mailing list archive)
State New
Headers show
Series uprobes,mm: speculative lockless VMA-to-uprobe lookup | expand

Commit Message

Andrii Nakryiko Oct. 10, 2024, 8:56 p.m. UTC 
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 <oleg@redhat.com>
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
---
 kernel/events/uprobes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 2a0059464383..fa1024aad6c4 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -2057,7 +2057,7 @@  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);