Before writing, if a buffer_head marked as new, its data must
be zeroed, otherwise uninitialized data in the page cache will
be written.
So this commit uses folio_zero_new_buffers() to zero the new
buffers before ->write_end().
Fixes: 6630ea49103c ("exfat: move extend valid_size into ->page_mkwrite()")
Reported-by: syzbot+91ae49e1c1a2634d20c0@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=91ae49e1c1a2634d20c0
Tested-by: syzbot+91ae49e1c1a2634d20c0@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Yuezhang Mo <Yuezhang.Mo@xxxxxxxx>
---
fs/exfat/file.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index fb38769c3e39..05b51e721783 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -545,6 +545,7 @@ static int exfat_extend_valid_size(struct file *file, loff_t new_valid_size)
while (pos < new_valid_size) {
u32 len;
struct folio *folio;
+ unsigned long off;
len = PAGE_SIZE - (pos & (PAGE_SIZE - 1));
if (pos + len > new_valid_size)
@@ -554,6 +555,9 @@ static int exfat_extend_valid_size(struct file *file, loff_t new_valid_size)
if (err)
goto out;
+ off = offset_in_folio(folio, pos);
+ folio_zero_new_buffers(folio, off, off + len);
+
err = ops->write_end(file, mapping, pos, len, len, folio, NULL);
if (err < 0)
goto out;
@@ -563,6 +567,8 @@ static int exfat_extend_valid_size(struct file *file, loff_t new_valid_size)
cond_resched();
}
+ return 0;
+
out:
return err;
}
--
2.43.0
From c3806c35811ce47e143f3d251ced18c481a0d808 Mon Sep 17 00:00:00 2001
From: Yuezhang Mo <Yuezhang.Mo@xxxxxxxx>
Date: Thu, 12 Dec 2024 16:29:23 +0800
Subject: [PATCH v2] exfat: fix the new buffer was not zeroed before writing
Before writing, if a buffer_head marked as new, its data must
be zeroed, otherwise uninitialized data in the page cache will
be written.
So this commit uses folio_zero_new_buffers() to zero the new
buffers before ->write_end().
Fixes: 6630ea49103c ("exfat: move extend valid_size into ->page_mkwrite()")
Reported-by: syzbot+91ae49e1c1a2634d20c0@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=91ae49e1c1a2634d20c0
Tested-by: syzbot+91ae49e1c1a2634d20c0@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Yuezhang Mo <Yuezhang.Mo@xxxxxxxx>
---
fs/exfat/file.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index fb38769c3e39..05b51e721783 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -545,6 +545,7 @@ static int exfat_extend_valid_size(struct file *file, loff_t new_valid_size)
while (pos < new_valid_size) {
u32 len;
struct folio *folio;
+ unsigned long off;
len = PAGE_SIZE - (pos & (PAGE_SIZE - 1));
if (pos + len > new_valid_size)
@@ -554,6 +555,9 @@ static int exfat_extend_valid_size(struct file *file, loff_t new_valid_size)
if (err)
goto out;
+ off = offset_in_folio(folio, pos);
+ folio_zero_new_buffers(folio, off, off + len);
+
err = ops->write_end(file, mapping, pos, len, len, folio, NULL);
if (err < 0)
goto out;
@@ -563,6 +567,8 @@ static int exfat_extend_valid_size(struct file *file, loff_t new_valid_size)
cond_resched();
}
+ return 0;
+
out:
return err;
}
--
2.43.0
