[PATCH v3 tip/perf/core 3/4] uprobes: simplify find_active_uprobe_rcu() VMA checks
From: Andrii Nakryiko <andrii@kernel.org>
Date: 2024-10-10 20:56:57
Also in:
bpf, linux-mm, lkml
Subsystem:
performance events subsystem, the rest, uprobes · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds, Masami Hiramatsu, Oleg Nesterov
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 --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);
--
2.43.5