diff mbox series

jffs2: correct logic when creating a hole in jffs2_write_begin

Message ID 20220803155315.2073584-1-yifeliu@cs.stonybrook.edu
State New
Delegated to: Richard Weinberger
Headers show
Series jffs2: correct logic when creating a hole in jffs2_write_begin | expand

Commit Message

Yifei Liu Aug. 3, 2022, 3:53 p.m. UTC 
Bug description and fix:

1. Write data to a file, say all 1s from offset 0 to 16.

2. Truncate the file to a smaller size, say 8 bytes.

3. Write new bytes (say 2s) from an offset past the original size of the
file, say at offset 20, for 4 bytes.  This is supposed to create a "hole"
in the file, meaning that the bytes from offset 8 (where it was truncated
above) up to the new write at offset 20, should all be 0s (zeros).

4. Flush all caches using "echo 3 > /proc/sys/vm/drop_caches" (or unmount
and remount) the f/s.

5. Check the content of the file.  It is wrong.  The 1s that used to be
between bytes 9 and 16, before the truncation, have REAPPEARED (they should
be 0s).

We wrote a script and helper C program to reproduce the bug
(reproduce_jffs2_write_begin_issue.sh, write_file.c, and Makefile).  We can
make them available to anyone.

The above example is shown when writing a small file within the same first
page.  But the bug happens for larger files, as long as steps 1, 2, and 3
above all happen within the same page.

The problem was traced to the jffs2_write_begin code, where it goes into an
'if' statement intended to handle writes past the current EOF (i.e., writes
that may create a hole).  The code computes a 'pageofs' that is the floor
of the write position (pos), aligned to the page size boundary.  In other
words, 'pageofs' will never be larger than 'pos'.  The code then sets the
internal jffs2_raw_inode->isize to the size of max(current inode size,
pageofs) but that is wrong: the new file size should be the 'pos', which is
larger than both the current inode size and pageofs.

Similarly, the code incorrectly sets the internal jffs2_raw_inode->dsize to
the difference between the pageofs minus current inode size; instead it
should be the current pos minus the current inode size.  Finally,
inode->i_size was also set incorrectly.

The patch below fixes this bug.  The bug was discovered using a new tool
for finding f/s bugs using model checking, called MCFS (Model Checking File
Systems).

Signed-off-by: Yifei Liu <yifeliu@cs.stonybrook.edu>
Signed-off-by: Erez Zadok <ezk@cs.stonybrook.edu>
Signed-off-by: Manish Adkar <madkar@cs.stonybrook.edu>
---
 fs/jffs2/file.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

Comments

Joakim Tjernlund Aug. 21, 2022, 6:21 p.m. UTC | #1 
What happened with this patch? Looks like a important fix but I don't see it applied ?

  Jocke
Richard Weinberger Aug. 22, 2022, 6:25 a.m. UTC | #2 
----- Ursprüngliche Mail -----
> Von: "Joakim Tjernlund" <Joakim.Tjernlund@infinera.com>
> An: "Yifei Liu" <yifeliu@cs.stonybrook.edu>
> CC: ezk@cs.stonybrook.edu, madkar@cs.stonybrook.edu, "David Woodhouse" <dwmw2@infradead.org>, "richard"
> <richard@nod.at>, "Matthew Wilcox" <willy@infradead.org>, "Kyeong Yoo" <kyeong.yoo@alliedtelesis.co.nz>, "linux-mtd"
> <linux-mtd@lists.infradead.org>, "linux-kernel" <linux-kernel@vger.kernel.org>
> Gesendet: Sonntag, 21. August 2022 20:21:04
> Betreff: Re: [PATCH] jffs2: correct logic when creating a hole in jffs2_write_begin

> What happened with this patch? Looks like a important fix but I don't see it
> applied ?

It will be part of the next fixes PR after I had a chance to review it.

Thanks,
//richard
Yifei Liu Sept. 4, 2022, 7:39 p.m. UTC | #3 
A gentle reminder.

Best Regards,
Yifei

Best Regards,
Yifei


On Mon, Aug 22, 2022 at 2:26 AM Richard Weinberger <richard@nod.at> wrote:
>
> ----- Ursprüngliche Mail -----
> > Von: "Joakim Tjernlund" <Joakim.Tjernlund@infinera.com>
> > An: "Yifei Liu" <yifeliu@cs.stonybrook.edu>
> > CC: ezk@cs.stonybrook.edu, madkar@cs.stonybrook.edu, "David Woodhouse" <dwmw2@infradead.org>, "richard"
> > <richard@nod.at>, "Matthew Wilcox" <willy@infradead.org>, "Kyeong Yoo" <kyeong.yoo@alliedtelesis.co.nz>, "linux-mtd"
> > <linux-mtd@lists.infradead.org>, "linux-kernel" <linux-kernel@vger.kernel.org>
> > Gesendet: Sonntag, 21. August 2022 20:21:04
> > Betreff: Re: [PATCH] jffs2: correct logic when creating a hole in jffs2_write_begin
>
> > What happened with this patch? Looks like a important fix but I don't see it
> > applied ?
>
> It will be part of the next fixes PR after I had a chance to review it.
>
> Thanks,
> //richard
Yifei Liu Sept. 21, 2022, 9:30 p.m. UTC | #4 
A reminder about a JFFS2 patch submitted months ago.

Best Regards,
Yifei


On Sun, Sep 4, 2022 at 3:39 PM Yifei Liu <yifeliu@cs.stonybrook.edu> wrote:
>
> A gentle reminder.
>
> Best Regards,
> Yifei
>
> Best Regards,
> Yifei
>
>
> On Mon, Aug 22, 2022 at 2:26 AM Richard Weinberger <richard@nod.at> wrote:
> >
> > ----- Ursprüngliche Mail -----
> > > Von: "Joakim Tjernlund" <Joakim.Tjernlund@infinera.com>
> > > An: "Yifei Liu" <yifeliu@cs.stonybrook.edu>
> > > CC: ezk@cs.stonybrook.edu, madkar@cs.stonybrook.edu, "David Woodhouse" <dwmw2@infradead.org>, "richard"
> > > <richard@nod.at>, "Matthew Wilcox" <willy@infradead.org>, "Kyeong Yoo" <kyeong.yoo@alliedtelesis.co.nz>, "linux-mtd"
> > > <linux-mtd@lists.infradead.org>, "linux-kernel" <linux-kernel@vger.kernel.org>
> > > Gesendet: Sonntag, 21. August 2022 20:21:04
> > > Betreff: Re: [PATCH] jffs2: correct logic when creating a hole in jffs2_write_begin
> >
> > > What happened with this patch? Looks like a important fix but I don't see it
> > > applied ?
> >
> > It will be part of the next fixes PR after I had a chance to review it.
> >
> > Thanks,
> > //richard
diff mbox series

Patch

diff --git a/fs/jffs2/file.c b/fs/jffs2/file.c
index ba86acbe12d3..0479096b96e4 100644
--- a/fs/jffs2/file.c
+++ b/fs/jffs2/file.c
@@ -137,19 +137,18 @@  static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
 	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
 	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
 	pgoff_t index = pos >> PAGE_SHIFT;
-	uint32_t pageofs = index << PAGE_SHIFT;
 	int ret = 0;
 
 	jffs2_dbg(1, "%s()\n", __func__);
 
-	if (pageofs > inode->i_size) {
-		/* Make new hole frag from old EOF to new page */
+	if (pos > inode->i_size) {
+		/* Make new hole frag from old EOF to new position */
 		struct jffs2_raw_inode ri;
 		struct jffs2_full_dnode *fn;
 		uint32_t alloc_len;
 
-		jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new page\n",
-			  (unsigned int)inode->i_size, pageofs);
+		jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new position\n",
+			  (unsigned int)inode->i_size, (uint32_t)pos);
 
 		ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len,
 					  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
@@ -169,10 +168,10 @@  static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
 		ri.mode = cpu_to_jemode(inode->i_mode);
 		ri.uid = cpu_to_je16(i_uid_read(inode));
 		ri.gid = cpu_to_je16(i_gid_read(inode));
-		ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs));
+		ri.isize = cpu_to_je32((uint32_t)pos);
 		ri.atime = ri.ctime = ri.mtime = cpu_to_je32(JFFS2_NOW());
 		ri.offset = cpu_to_je32(inode->i_size);
-		ri.dsize = cpu_to_je32(pageofs - inode->i_size);
+		ri.dsize = cpu_to_je32((uint32_t)pos - inode->i_size);
 		ri.csize = cpu_to_je32(0);
 		ri.compr = JFFS2_COMPR_ZERO;
 		ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8));
@@ -202,7 +201,7 @@  static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
 			goto out_err;
 		}
 		jffs2_complete_reservation(c);
-		inode->i_size = pageofs;
+		inode->i_size = pos;
 		mutex_unlock(&f->sem);
 	}