From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Tue, 16 Mar 2021 19:57:44 +0000 (-0400)
Subject: binfmt_elf rcu fix
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=05609bed8d8d299d1f7d6ed4a86d0b6281d30e81;p=users%2Fjedix%2Flinux-maple.git

binfmt_elf rcu fix

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index ab1d7f0b48ea1..1a672f5ddcd15 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1634,6 +1634,7 @@ static int fill_files_note(struct memelfnote *note)
 	name_base = name_curpos = ((char *)data) + names_ofs;
 	remaining = size - names_ofs;
 	count = 0;
+	rcu_read_lock();
 	mas_for_each(&mas, vma, ULONG_MAX) {
 		struct file *file;
 		const char *filename;
@@ -1663,6 +1664,7 @@ static int fill_files_note(struct memelfnote *note)
 		*start_end_ofs++ = vma->vm_pgoff;
 		count++;
 	}
+	rcu_read_unlock();
 
 	/* Now we know exact count of files, can store it */
 	data[0] = count;