diff mbox series

jffs2: correct logic when creating a hole in jffs2_write_begin

Message ID 20220725045830.11502-1-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 July 25, 2022, 4:58 a.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

Vanessa Page July 25, 2022, 5:03 a.m. UTC | #1
๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜๐Ÿ‘Œ๐Ÿ˜๐Ÿ‘Œ๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜โ˜บ๏ธโ˜บ๏ธโ˜บ๏ธโ˜บ๏ธโ˜บ๏ธ๐Ÿ’•๐Ÿ’•๐Ÿ˜š๐Ÿ˜š๐Ÿ˜š๐Ÿ˜š๐Ÿฅฐ๐Ÿ˜š๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜š๐Ÿ˜š๐Ÿ˜โ˜บ๏ธโ˜บ๏ธโ˜บ๏ธ๐Ÿ˜๐Ÿ’•๐Ÿ˜š๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ˜š๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธ๐Ÿ˜๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ’•๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ˜Š

Sent from my iPhonโœŒ๏ธ

> On Jul 25, 2022, at 1:01 AM, Yifei Liu <yifeliu@cs.stonybrook.edu> wrote:
> 
> ๏ปฟBug 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(-)
> 
> 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);
>    }
> 
> -- 
> 2.25.1
> 
> 
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
Vanessa Page July 25, 2022, 9:34 p.m. UTC | #2
Koop๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜Ž๐Ÿ˜„๐Ÿ˜„๐Ÿ˜ด๐Ÿ˜ด๐Ÿ‘€๐Ÿ‘€๐Ÿ’๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ’๐Ÿ‘€๐Ÿ‘€๐Ÿ˜‘๐Ÿ’๐Ÿ˜๐Ÿ˜ณ๐Ÿ˜Ž๐Ÿ˜ด๐Ÿ˜‘๐Ÿ‘€๐Ÿ˜‘๐Ÿ˜„๐Ÿคฃ๐Ÿคฃ๐Ÿ˜€๐Ÿ˜ƒ๐Ÿ˜‘๐Ÿ˜ด๐Ÿ˜„๐Ÿคฅ๐Ÿคซ๐Ÿ˜ฅ๐Ÿ˜ฐ๐Ÿฅต๐Ÿฅต๐Ÿ˜ก๐Ÿ˜ก๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ญ๐Ÿ˜ญ๐Ÿ˜Ÿ๐Ÿ˜Ÿ๐Ÿฅณ๐Ÿคฉ๐Ÿฅธ๐Ÿฅธ๐Ÿฅธ๐Ÿ™๐Ÿ˜ฉ๐Ÿฅบโ˜น๏ธ๐Ÿ˜ฃ๐Ÿ˜”๐Ÿ˜”๐Ÿ˜”๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ˜ข๐Ÿ˜ก๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿ˜ฅ๐Ÿ˜ฅ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿคซ๐Ÿคซ๐Ÿ˜“๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ
Ooiggvklpoure๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคซ๐Ÿ˜“๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฌ๐Ÿคฌ๐Ÿ™๐Ÿ˜’๐Ÿ˜๐Ÿ˜’๐Ÿ˜’๐Ÿ˜Ž๐Ÿฅธ๐Ÿคฉ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿฅบ๐Ÿ˜ฉ๐Ÿ˜ฉ๐Ÿคฉ๐Ÿฅณ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ™๐Ÿ˜ฉโ˜น๏ธ๐Ÿ˜Ÿ๐Ÿ˜ซ๐Ÿ˜ค๐Ÿ˜ญ๐Ÿคฌ๐Ÿคฉ๐Ÿคฉ๐Ÿฅธ๐Ÿ˜Ž๐Ÿ™๐Ÿ˜ฉ๐Ÿ˜ก๐Ÿ˜ต๐Ÿ˜ช๐Ÿ˜ง๐Ÿคฅ๐Ÿคฅ๐Ÿ˜ฏ๐Ÿ˜ต๐Ÿคฎ๐Ÿ˜ฌ๐Ÿคฅ๐Ÿ˜“๐Ÿค—๐Ÿค—๐Ÿ˜ถ๐Ÿ˜ฒ๐Ÿคค๐Ÿค๐Ÿค’๐Ÿค•๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿค‘๐Ÿ˜ผ๐Ÿ˜ฝโ˜ ๏ธ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘น๐Ÿ‘น๐Ÿ‘บ๐Ÿ‘ฝ๐Ÿ‘ฝ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ’€๐Ÿ’€๐Ÿ’€โ˜ ๏ธโ˜ ๏ธโ˜ ๏ธโ˜ ๏ธ

> On Jul 25, 2022, at 1:06 AM, Vanessa Page <Vebpe@outlook.com> wrote:
> 
> ๏ปฟ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜๐Ÿ‘Œ๐Ÿ˜๐Ÿ‘Œ๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜โ˜บ๏ธโ˜บ๏ธโ˜บ๏ธโ˜บ๏ธโ˜บ๏ธ๐Ÿ’•๐Ÿ’•๐Ÿ˜š๐Ÿ˜š๐Ÿ˜š๐Ÿ˜š๐Ÿฅฐ๐Ÿ˜š๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜š๐Ÿ˜š๐Ÿ˜โ˜บ๏ธโ˜บ๏ธโ˜บ๏ธ๐Ÿ˜๐Ÿ’•๐Ÿ˜š๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ˜š๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธ๐Ÿ˜๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ’•๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ˜Š
> 
> Sent from my iPhonโœŒ๏ธ
> 
>> On Jul 25, 2022, at 1:01 AM, Yifei Liu <yifeliu@cs.stonybrook.edu> wrote:
>> 
>> ๏ปฟBug 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(-)
>> 
>> 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);
>>   }
>> 
>> -- 
>> 2.25.1
>> 
>> 
>> ______________________________________________________
>> Linux MTD discussion mailing list
>> http://lists.infradead.org/mailman/listinfo/linux-mtd/
Vanessa Page July 25, 2022, 10:07 p.m. UTC | #3
Koop๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜Ž๐Ÿ˜„๐Ÿ˜„๐Ÿ˜ด๐Ÿ˜ด๐Ÿ‘€๐Ÿ‘€๐Ÿ’๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ’๐Ÿ‘€๐Ÿ‘€๐Ÿ˜‘๐Ÿ’๐Ÿ˜๐Ÿ˜ณ๐Ÿ˜Ž๐Ÿ˜ด๐Ÿ˜‘๐Ÿ‘€๐Ÿ˜‘๐Ÿ˜„๐Ÿคฃ๐Ÿคฃ๐Ÿ˜€๐Ÿ˜ƒ๐Ÿ˜‘๐Ÿ˜ด๐Ÿ˜„๐Ÿคฅ๐Ÿคซ๐Ÿ˜ฅ๐Ÿ˜ฐ๐Ÿฅต๐Ÿฅต๐Ÿ˜ก๐Ÿ˜ก๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ญ๐Ÿ˜ญ๐Ÿ˜Ÿ๐Ÿ˜Ÿ๐Ÿฅณ๐Ÿคฉ๐Ÿฅธ๐Ÿฅธ๐Ÿฅธ๐Ÿ™๐Ÿ˜ฉ๐Ÿฅบโ˜น๏ธ๐Ÿ˜ฃ๐Ÿ˜”๐Ÿ˜”๐Ÿ˜”๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ˜ข๐Ÿ˜ก๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿ˜ฅ๐Ÿ˜ฅ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿคซ๐Ÿคซ๐Ÿ˜“๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ
Ooiggvklpoure๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคซ๐Ÿ˜“๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฌ๐Ÿคฌ๐Ÿ™๐Ÿ˜’๐Ÿ˜๐Ÿ˜’๐Ÿ˜’๐Ÿ˜Ž๐Ÿฅธ๐Ÿคฉ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿฅบ๐Ÿ˜ฉ๐Ÿ˜ฉ๐Ÿคฉ๐Ÿฅณ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ™๐Ÿ˜ฉโ˜น๏ธ๐Ÿ˜Ÿ๐Ÿ˜ซ๐Ÿ˜ค๐Ÿ˜ญ๐Ÿคฌ๐Ÿคฉ๐Ÿคฉ๐Ÿฅธ๐Ÿ˜Ž๐Ÿ™๐Ÿ˜ฉ๐Ÿ˜ก๐Ÿ˜ต๐Ÿ˜ช๐Ÿ˜ง๐Ÿคฅ๐Ÿคฅ๐Ÿ˜ฏ๐Ÿ˜ต๐Ÿคฎ๐Ÿ˜ฌ๐Ÿคฅ๐Ÿ˜“๐Ÿค—๐Ÿค—๐Ÿ˜ถ๐Ÿ˜ฒ๐Ÿคค๐Ÿค๐Ÿค’๐Ÿค•๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿค‘๐Ÿ˜ผ๐Ÿ˜ฝโ˜ ๏ธ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘น๐Ÿ‘น๐Ÿ‘บ๐Ÿ‘ฝ๐Ÿ‘ฝ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ’€๐Ÿ’€๐Ÿ’€โ˜ ๏ธโ˜ ๏ธโ˜ ๏ธโ˜ ๏ธ

Sent from my iPhone

> On Jul 25, 2022, at 5:37 PM, Vanessa Page <Vebpe@outlook.com> wrote:
> 
> Koop๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜Ž๐Ÿ˜„๐Ÿ˜„๐Ÿ˜ด๐Ÿ˜ด๐Ÿ‘€๐Ÿ‘€๐Ÿ’๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ’๐Ÿ‘€๐Ÿ‘€๐Ÿ˜‘๐Ÿ’๐Ÿ˜๐Ÿ˜ณ๐Ÿ˜Ž๐Ÿ˜ด๐Ÿ˜‘๐Ÿ‘€๐Ÿ˜‘๐Ÿ˜„๐Ÿคฃ๐Ÿคฃ๐Ÿ˜€๐Ÿ˜ƒ๐Ÿ˜‘๐Ÿ˜ด๐Ÿ˜„๐Ÿคฅ๐Ÿคซ๐Ÿ˜ฅ๐Ÿ˜ฐ๐Ÿฅต๐Ÿฅต๐Ÿ˜ก๐Ÿ˜ก๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ญ๐Ÿ˜ญ๐Ÿ˜Ÿ๐Ÿ˜Ÿ๐Ÿฅณ๐Ÿคฉ๐Ÿฅธ๐Ÿฅธ๐Ÿฅธ๐Ÿ™๐Ÿ˜ฉ๐Ÿฅบโ˜น๏ธ๐Ÿ˜ฃ๐Ÿ˜”๐Ÿ˜”๐Ÿ˜”๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ˜ข๐Ÿ˜ก๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿ˜ฅ๐Ÿ˜ฅ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿคซ๐Ÿคซ๐Ÿ˜“๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ
> Ooiggvklpoure๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคซ๐Ÿ˜“๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฌ๐Ÿคฌ๐Ÿ™๐Ÿ˜’๐Ÿ˜๐Ÿ˜’๐Ÿ˜’๐Ÿ˜Ž๐Ÿฅธ๐Ÿคฉ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿฅบ๐Ÿ˜ฉ๐Ÿ˜ฉ๐Ÿคฉ๐Ÿฅณ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ™๐Ÿ˜ฉโ˜น๏ธ๐Ÿ˜Ÿ๐Ÿ˜ซ๐Ÿ˜ค๐Ÿ˜ญ๐Ÿคฌ๐Ÿคฉ๐Ÿคฉ๐Ÿฅธ๐Ÿ˜Ž๐Ÿ™๐Ÿ˜ฉ๐Ÿ˜ก๐Ÿ˜ต๐Ÿ˜ช๐Ÿ˜ง๐Ÿคฅ๐Ÿคฅ๐Ÿ˜ฏ๐Ÿ˜ต๐Ÿคฎ๐Ÿ˜ฌ๐Ÿคฅ๐Ÿ˜“๐Ÿค—๐Ÿค—๐Ÿ˜ถ๐Ÿ˜ฒ๐Ÿคค๐Ÿค๐Ÿค’๐Ÿค•๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿค‘๐Ÿ˜ผ๐Ÿ˜ฝโ˜ ๏ธ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘น๐Ÿ‘น๐Ÿ‘บ๐Ÿ‘ฝ๐Ÿ‘ฝ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ’€๐Ÿ’€๐Ÿ’€โ˜ ๏ธโ˜ ๏ธโ˜ ๏ธโ˜ ๏ธ
Vanessa Page July 25, 2022, 10:08 p.m. UTC | #4
Koop๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜Ž๐Ÿ˜„๐Ÿ˜„๐Ÿ˜ด๐Ÿ˜ด๐Ÿ‘€๐Ÿ‘€๐Ÿ’๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ’๐Ÿ‘€๐Ÿ‘€๐Ÿ˜‘๐Ÿ’๐Ÿ˜๐Ÿ˜ณ๐Ÿ˜Ž๐Ÿ˜ด๐Ÿ˜‘๐Ÿ‘€๐Ÿ˜‘๐Ÿ˜„๐Ÿคฃ๐Ÿคฃ๐Ÿ˜€๐Ÿ˜ƒ๐Ÿ˜‘๐Ÿ˜ด๐Ÿ˜„๐Ÿคฅ๐Ÿคซ๐Ÿ˜ฅ๐Ÿ˜ฐ๐Ÿฅต๐Ÿฅต๐Ÿ˜ก๐Ÿ˜ก๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ญ๐Ÿ˜ญ๐Ÿ˜Ÿ๐Ÿ˜Ÿ๐Ÿฅณ๐Ÿคฉ๐Ÿฅธ๐Ÿฅธ๐Ÿฅธ๐Ÿ™๐Ÿ˜ฉ๐Ÿฅบโ˜น๏ธ๐Ÿ˜ฃ๐Ÿ˜”๐Ÿ˜”๐Ÿ˜”๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ˜ข๐Ÿ˜ก๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿ˜ฅ๐Ÿ˜ฅ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿคซ๐Ÿคซ๐Ÿ˜“๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ
Ooiggvklpoure๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคซ๐Ÿ˜“๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฌ๐Ÿคฌ๐Ÿ™๐Ÿ˜’๐Ÿ˜๐Ÿ˜’๐Ÿ˜’๐Ÿ˜Ž๐Ÿฅธ๐Ÿคฉ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿฅบ๐Ÿ˜ฉ๐Ÿ˜ฉ๐Ÿคฉ๐Ÿฅณ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ™๐Ÿ˜ฉโ˜น๏ธ๐Ÿ˜Ÿ๐Ÿ˜ซ๐Ÿ˜ค๐Ÿ˜ญ๐Ÿคฌ๐Ÿคฉ๐Ÿคฉ๐Ÿฅธ๐Ÿ˜Ž๐Ÿ™๐Ÿ˜ฉ๐Ÿ˜ก๐Ÿ˜ต๐Ÿ˜ช๐Ÿ˜ง๐Ÿคฅ๐Ÿคฅ๐Ÿ˜ฏ๐Ÿ˜ต๐Ÿคฎ๐Ÿ˜ฌ๐Ÿคฅ๐Ÿ˜“๐Ÿค—๐Ÿค—๐Ÿ˜ถ๐Ÿ˜ฒ๐Ÿคค๐Ÿค๐Ÿค’๐Ÿค•๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿค‘๐Ÿ˜ผ๐Ÿ˜ฝโ˜ ๏ธ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘น๐Ÿ‘น๐Ÿ‘บ๐Ÿ‘ฝ๐Ÿ‘ฝ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ’€๐Ÿ’€๐Ÿ’€โ˜ ๏ธโ˜ ๏ธโ˜ ๏ธโ˜ ๏ธ

Sent from my iPhone

> On Jul 25, 2022, at 1:04 AM, Vanessa Page <Vebpe@outlook.com> wrote:
> 
> ๏ปฟ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜๐Ÿ‘Œ๐Ÿ˜๐Ÿ‘Œ๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜โ˜บ๏ธโ˜บ๏ธโ˜บ๏ธโ˜บ๏ธโ˜บ๏ธ๐Ÿ’•๐Ÿ’•๐Ÿ˜š๐Ÿ˜š๐Ÿ˜š๐Ÿ˜š๐Ÿฅฐ๐Ÿ˜š๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜š๐Ÿ˜š๐Ÿ˜โ˜บ๏ธโ˜บ๏ธโ˜บ๏ธ๐Ÿ˜๐Ÿ’•๐Ÿ˜š๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ˜š๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธ๐Ÿ˜๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ’•๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ˜Š
> 
> Sent from my iPhonโœŒ๏ธ
> 
>> On Jul 25, 2022, at 1:01 AM, Yifei Liu <yifeliu@cs.stonybrook.edu> wrote:
>> 
>> ๏ปฟBug 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(-)
>> 
>> 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);
>>   }
>> 
>> -- 
>> 2.25.1
>> 
>> 
>> ______________________________________________________
>> Linux MTD discussion mailing list
>> http://lists.infradead.org/mailman/listinfo/linux-mtd/
Vanessa Page July 25, 2022, 10:08 p.m. UTC | #5
You lame ass stalking motherfucker. You are committing a crime and I have reported you to the police. 

Koop๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜Ž๐Ÿ˜„๐Ÿ˜„๐Ÿ˜ด๐Ÿ˜ด๐Ÿ‘€๐Ÿ‘€๐Ÿ’๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ’๐Ÿ‘€๐Ÿ‘€๐Ÿ˜‘๐Ÿ’๐Ÿ˜๐Ÿ˜ณ๐Ÿ˜Ž๐Ÿ˜ด๐Ÿ˜‘๐Ÿ‘€๐Ÿ˜‘๐Ÿ˜„๐Ÿคฃ๐Ÿคฃ๐Ÿ˜€๐Ÿ˜ƒ๐Ÿ˜‘๐Ÿ˜ด๐Ÿ˜„๐Ÿคฅ๐Ÿคซ๐Ÿ˜ฅ๐Ÿ˜ฐ๐Ÿฅต๐Ÿฅต๐Ÿ˜ก๐Ÿ˜ก๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ญ๐Ÿ˜ญ๐Ÿ˜Ÿ๐Ÿ˜Ÿ๐Ÿฅณ๐Ÿคฉ๐Ÿฅธ๐Ÿฅธ๐Ÿฅธ๐Ÿ™๐Ÿ˜ฉ๐Ÿฅบโ˜น๏ธ๐Ÿ˜ฃ๐Ÿ˜”๐Ÿ˜”๐Ÿ˜”๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ˜ข๐Ÿ˜ก๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿ˜ฅ๐Ÿ˜ฅ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿคซ๐Ÿคซ๐Ÿ˜“๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ
Ooiggvklpoure๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคซ๐Ÿ˜“๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฌ๐Ÿคฌ๐Ÿ™๐Ÿ˜’๐Ÿ˜๐Ÿ˜’๐Ÿ˜’๐Ÿ˜Ž๐Ÿฅธ๐Ÿคฉ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿฅบ๐Ÿ˜ฉ๐Ÿ˜ฉ๐Ÿคฉ๐Ÿฅณ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ™๐Ÿ˜ฉโ˜น๏ธ๐Ÿ˜Ÿ๐Ÿ˜ซ๐Ÿ˜ค๐Ÿ˜ญ๐Ÿคฌ๐Ÿคฉ๐Ÿคฉ๐Ÿฅธ๐Ÿ˜Ž๐Ÿ™๐Ÿ˜ฉ๐Ÿ˜ก๐Ÿ˜ต๐Ÿ˜ช๐Ÿ˜ง๐Ÿคฅ๐Ÿคฅ๐Ÿ˜ฏ๐Ÿ˜ต๐Ÿคฎ๐Ÿ˜ฌ๐Ÿคฅ๐Ÿ˜“๐Ÿค—๐Ÿค—๐Ÿ˜ถ๐Ÿ˜ฒ๐Ÿคค๐Ÿค๐Ÿค’๐Ÿค•๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿค‘๐Ÿ˜ผ๐Ÿ˜ฝโ˜ ๏ธ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘น๐Ÿ‘น๐Ÿ‘บ๐Ÿ‘ฝ๐Ÿ‘ฝ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ’€๐Ÿ’€๐Ÿ’€โ˜ ๏ธโ˜ ๏ธโ˜ ๏ธโ˜ ๏ธ

> On Jul 25, 2022, at 1:04 AM, Vanessa Page <Vebpe@outlook.com> wrote:
> 
> ๏ปฟ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜๐Ÿ‘Œ๐Ÿ˜๐Ÿ‘Œ๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜โ˜บ๏ธโ˜บ๏ธโ˜บ๏ธโ˜บ๏ธโ˜บ๏ธ๐Ÿ’•๐Ÿ’•๐Ÿ˜š๐Ÿ˜š๐Ÿ˜š๐Ÿ˜š๐Ÿฅฐ๐Ÿ˜š๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜š๐Ÿ˜š๐Ÿ˜โ˜บ๏ธโ˜บ๏ธโ˜บ๏ธ๐Ÿ˜๐Ÿ’•๐Ÿ˜š๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ˜š๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธ๐Ÿ˜๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ’•๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ˜Š
> 
> Sent from my iPhonโœŒ๏ธ
> 
>> On Jul 25, 2022, at 1:01 AM, Yifei Liu <yifeliu@cs.stonybrook.edu> wrote:
>> 
>> ๏ปฟBug 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(-)
>> 
>> 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);
>>   }
>> 
>> -- 
>> 2.25.1
>> 
>> 
>> ______________________________________________________
>> Linux MTD discussion mailing list
>> http://lists.infradead.org/mailman/listinfo/linux-mtd/
Vanessa Page July 26, 2022, 12:11 a.m. UTC | #6
Stop fucking emailing me you suck fuck. You want a password so you can hack my shit you broke motherfucker

People are not THAT stupid. 

> On Jul 25, 2022, at 6:11 PM, Vanessa Page <Vebpe@outlook.com> wrote:
> 
> ๏ปฟYou lame ass stalking motherfucker. You are committing a crime and I have reported you to the police. 
> 
> Koop๐Ÿ˜‚๐Ÿ˜‚๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜‘๐Ÿ˜Ž๐Ÿ˜„๐Ÿ˜„๐Ÿ˜ด๐Ÿ˜ด๐Ÿ‘€๐Ÿ‘€๐Ÿ’๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ™ˆ๐Ÿ’๐Ÿ‘€๐Ÿ‘€๐Ÿ˜‘๐Ÿ’๐Ÿ˜๐Ÿ˜ณ๐Ÿ˜Ž๐Ÿ˜ด๐Ÿ˜‘๐Ÿ‘€๐Ÿ˜‘๐Ÿ˜„๐Ÿคฃ๐Ÿคฃ๐Ÿ˜€๐Ÿ˜ƒ๐Ÿ˜‘๐Ÿ˜ด๐Ÿ˜„๐Ÿคฅ๐Ÿคซ๐Ÿ˜ฅ๐Ÿ˜ฐ๐Ÿฅต๐Ÿฅต๐Ÿ˜ก๐Ÿ˜ก๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ญ๐Ÿ˜ญ๐Ÿ˜Ÿ๐Ÿ˜Ÿ๐Ÿฅณ๐Ÿคฉ๐Ÿฅธ๐Ÿฅธ๐Ÿฅธ๐Ÿ™๐Ÿ˜ฉ๐Ÿฅบโ˜น๏ธ๐Ÿ˜ฃ๐Ÿ˜”๐Ÿ˜”๐Ÿ˜”๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ˜ข๐Ÿ˜ก๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿ˜ฅ๐Ÿ˜ฅ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿ˜ถโ€๐ŸŒซ๏ธ๐Ÿฅถ๐Ÿ˜ฐ๐Ÿ˜ฐ๐Ÿคซ๐Ÿคซ๐Ÿ˜“๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ
> Ooiggvklpoure๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคฏ๐Ÿคซ๐Ÿ˜“๐Ÿคฌ๐Ÿคฏ๐Ÿคฏ๐Ÿคฌ๐Ÿคฌ๐Ÿ™๐Ÿ˜’๐Ÿ˜๐Ÿ˜’๐Ÿ˜’๐Ÿ˜Ž๐Ÿฅธ๐Ÿคฉ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿฅบ๐Ÿ˜ฉ๐Ÿ˜ฉ๐Ÿคฉ๐Ÿฅณ๐Ÿฅณ๐Ÿ˜Ÿ๐Ÿ˜–๐Ÿ˜ฃ๐Ÿ™๐Ÿ˜ฉโ˜น๏ธ๐Ÿ˜Ÿ๐Ÿ˜ซ๐Ÿ˜ค๐Ÿ˜ญ๐Ÿคฌ๐Ÿคฉ๐Ÿคฉ๐Ÿฅธ๐Ÿ˜Ž๐Ÿ™๐Ÿ˜ฉ๐Ÿ˜ก๐Ÿ˜ต๐Ÿ˜ช๐Ÿ˜ง๐Ÿคฅ๐Ÿคฅ๐Ÿ˜ฏ๐Ÿ˜ต๐Ÿคฎ๐Ÿ˜ฌ๐Ÿคฅ๐Ÿ˜“๐Ÿค—๐Ÿค—๐Ÿ˜ถ๐Ÿ˜ฒ๐Ÿคค๐Ÿค๐Ÿค’๐Ÿค•๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿ˜ตโ€๐Ÿ’ซ๐Ÿค‘๐Ÿ˜ผ๐Ÿ˜ฝโ˜ ๏ธ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘ป๐Ÿ‘น๐Ÿ‘น๐Ÿ‘บ๐Ÿ‘ฝ๐Ÿ‘ฝ๐Ÿ’€๐Ÿ’€๐Ÿ‘ป๐Ÿ’€๐Ÿ’€๐Ÿ’€โ˜ ๏ธโ˜ ๏ธโ˜ ๏ธโ˜ ๏ธ
> 
>> On Jul 25, 2022, at 1:04 AM, Vanessa Page <Vebpe@outlook.com> wrote:
>> 
>> ๏ปฟ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜๐Ÿ‘Œ๐Ÿ˜๐Ÿ‘Œ๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜โ˜บ๏ธโ˜บ๏ธโ˜บ๏ธโ˜บ๏ธโ˜บ๏ธ๐Ÿ’•๐Ÿ’•๐Ÿ˜š๐Ÿ˜š๐Ÿ˜š๐Ÿ˜š๐Ÿฅฐ๐Ÿ˜š๐Ÿ˜๐Ÿ˜๐Ÿ˜๐Ÿ˜š๐Ÿ˜š๐Ÿ˜โ˜บ๏ธโ˜บ๏ธโ˜บ๏ธ๐Ÿ˜๐Ÿ’•๐Ÿ˜š๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ˜š๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธ๐Ÿ˜๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ’•๐Ÿฅฐ๐Ÿฅฐ๐Ÿ˜โ˜บ๏ธโ˜บ๏ธ๐Ÿ˜Š
>> 
>> Sent from my iPhonโœŒ๏ธ
>> 
>>>> On Jul 25, 2022, at 1:01 AM, Yifei Liu <yifeliu@cs.stonybrook.edu> wrote:
>>> 
>>> ๏ปฟBug 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(-)
>>> 
>>> 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);
>>>  }
>>> 
>>> -- 
>>> 2.25.1
>>> 
>>> 
>>> ______________________________________________________
>>> Linux MTD discussion mailing list
>>> http://lists.infradead.org/mailman/listinfo/linux-mtd/
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);
 	}