| 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 |
๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐๐๐๐๐๐๐๐๐โบ๏ธโบ๏ธโบ๏ธโบ๏ธโบ๏ธ๐๐๐๐๐๐๐ฅฐ๐๐๐๐๐๐๐โบ๏ธโบ๏ธโบ๏ธ๐๐๐๐ฅฐ๐ฅฐ๐โบ๏ธโบ๏ธ๐๐ฅฐ๐โบ๏ธ๐๐ฅฐ๐โบ๏ธโบ๏ธ๐๐ฅฐ๐ฅฐ๐โบ๏ธโบ๏ธ๐ Sent from my iPhonโ๏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/
Koop๐๐๐๐๐๐๐๐๐ด๐ด๐๐๐๐๐๐๐๐๐๐๐๐๐๐ณ๐๐ด๐๐๐๐๐คฃ๐คฃ๐๐๐๐ด๐๐คฅ๐คซ๐ฅ๐ฐ๐ฅต๐ฅต๐ก๐ก๐คฌ๐คฏ๐ญ๐ญ๐๐๐ฅณ๐คฉ๐ฅธ๐ฅธ๐ฅธ๐๐ฉ๐ฅบโน๏ธ๐ฃ๐๐๐๐๐ฃ๐ข๐ก๐ฅถ๐ฐ๐ฐ๐ฅ๐ฅ๐ถโ๐ซ๏ธ๐คฌ๐คฌ๐คฌ๐คฏ๐ถโ๐ซ๏ธ๐ฅถ๐ฐ๐ฐ๐คซ๐คซ๐๐คฏ๐คฏ๐คฏ Ooiggvklpoure๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คซ๐๐คฌ๐คฏ๐คฏ๐คฌ๐คฌ๐๐๐๐๐๐๐ฅธ๐คฉ๐ฅณ๐๐๐ฅบ๐ฉ๐ฉ๐คฉ๐ฅณ๐ฅณ๐๐๐ฃ๐๐ฉโน๏ธ๐๐ซ๐ค๐ญ๐คฌ๐คฉ๐คฉ๐ฅธ๐๐๐ฉ๐ก๐ต๐ช๐ง๐คฅ๐คฅ๐ฏ๐ต๐คฎ๐ฌ๐คฅ๐๐ค๐ค๐ถ๐ฒ๐คค๐ค๐ค๐ค๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ค๐ผ๐ฝโ ๏ธ๐๐๐ป๐ป๐ป๐น๐น๐บ๐ฝ๐ฝ๐๐๐ป๐๐๐โ ๏ธโ ๏ธโ ๏ธโ ๏ธ > On Jul 25, 2022, at 1:06 AM, Vanessa Page <Vebpe@outlook.com> wrote: > > ๏ปฟ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐๐๐๐๐๐๐๐๐โบ๏ธโบ๏ธโบ๏ธโบ๏ธโบ๏ธ๐๐๐๐๐๐๐ฅฐ๐๐๐๐๐๐๐โบ๏ธโบ๏ธโบ๏ธ๐๐๐๐ฅฐ๐ฅฐ๐โบ๏ธโบ๏ธ๐๐ฅฐ๐โบ๏ธ๐๐ฅฐ๐โบ๏ธโบ๏ธ๐๐ฅฐ๐ฅฐ๐โบ๏ธโบ๏ธ๐ > > Sent from my iPhonโ๏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/
Koop๐๐๐๐๐๐๐๐๐ด๐ด๐๐๐๐๐๐๐๐๐๐๐๐๐๐ณ๐๐ด๐๐๐๐๐คฃ๐คฃ๐๐๐๐ด๐๐คฅ๐คซ๐ฅ๐ฐ๐ฅต๐ฅต๐ก๐ก๐คฌ๐คฏ๐ญ๐ญ๐๐๐ฅณ๐คฉ๐ฅธ๐ฅธ๐ฅธ๐๐ฉ๐ฅบโน๏ธ๐ฃ๐๐๐๐๐ฃ๐ข๐ก๐ฅถ๐ฐ๐ฐ๐ฅ๐ฅ๐ถโ๐ซ๏ธ๐คฌ๐คฌ๐คฌ๐คฏ๐ถโ๐ซ๏ธ๐ฅถ๐ฐ๐ฐ๐คซ๐คซ๐๐คฏ๐คฏ๐คฏ Ooiggvklpoure๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คซ๐๐คฌ๐คฏ๐คฏ๐คฌ๐คฌ๐๐๐๐๐๐๐ฅธ๐คฉ๐ฅณ๐๐๐ฅบ๐ฉ๐ฉ๐คฉ๐ฅณ๐ฅณ๐๐๐ฃ๐๐ฉโน๏ธ๐๐ซ๐ค๐ญ๐คฌ๐คฉ๐คฉ๐ฅธ๐๐๐ฉ๐ก๐ต๐ช๐ง๐คฅ๐คฅ๐ฏ๐ต๐คฎ๐ฌ๐คฅ๐๐ค๐ค๐ถ๐ฒ๐คค๐ค๐ค๐ค๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ค๐ผ๐ฝโ ๏ธ๐๐๐ป๐ป๐ป๐น๐น๐บ๐ฝ๐ฝ๐๐๐ป๐๐๐โ ๏ธโ ๏ธโ ๏ธโ ๏ธ Sent from my iPhone > On Jul 25, 2022, at 5:37 PM, Vanessa Page <Vebpe@outlook.com> wrote: > > Koop๐๐๐๐๐๐๐๐๐ด๐ด๐๐๐๐๐๐๐๐๐๐๐๐๐๐ณ๐๐ด๐๐๐๐๐คฃ๐คฃ๐๐๐๐ด๐๐คฅ๐คซ๐ฅ๐ฐ๐ฅต๐ฅต๐ก๐ก๐คฌ๐คฏ๐ญ๐ญ๐๐๐ฅณ๐คฉ๐ฅธ๐ฅธ๐ฅธ๐๐ฉ๐ฅบโน๏ธ๐ฃ๐๐๐๐๐ฃ๐ข๐ก๐ฅถ๐ฐ๐ฐ๐ฅ๐ฅ๐ถโ๐ซ๏ธ๐คฌ๐คฌ๐คฌ๐คฏ๐ถโ๐ซ๏ธ๐ฅถ๐ฐ๐ฐ๐คซ๐คซ๐๐คฏ๐คฏ๐คฏ > Ooiggvklpoure๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คซ๐๐คฌ๐คฏ๐คฏ๐คฌ๐คฌ๐๐๐๐๐๐๐ฅธ๐คฉ๐ฅณ๐๐๐ฅบ๐ฉ๐ฉ๐คฉ๐ฅณ๐ฅณ๐๐๐ฃ๐๐ฉโน๏ธ๐๐ซ๐ค๐ญ๐คฌ๐คฉ๐คฉ๐ฅธ๐๐๐ฉ๐ก๐ต๐ช๐ง๐คฅ๐คฅ๐ฏ๐ต๐คฎ๐ฌ๐คฅ๐๐ค๐ค๐ถ๐ฒ๐คค๐ค๐ค๐ค๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ค๐ผ๐ฝโ ๏ธ๐๐๐ป๐ป๐ป๐น๐น๐บ๐ฝ๐ฝ๐๐๐ป๐๐๐โ ๏ธโ ๏ธโ ๏ธโ ๏ธ
Koop๐๐๐๐๐๐๐๐๐ด๐ด๐๐๐๐๐๐๐๐๐๐๐๐๐๐ณ๐๐ด๐๐๐๐๐คฃ๐คฃ๐๐๐๐ด๐๐คฅ๐คซ๐ฅ๐ฐ๐ฅต๐ฅต๐ก๐ก๐คฌ๐คฏ๐ญ๐ญ๐๐๐ฅณ๐คฉ๐ฅธ๐ฅธ๐ฅธ๐๐ฉ๐ฅบโน๏ธ๐ฃ๐๐๐๐๐ฃ๐ข๐ก๐ฅถ๐ฐ๐ฐ๐ฅ๐ฅ๐ถโ๐ซ๏ธ๐คฌ๐คฌ๐คฌ๐คฏ๐ถโ๐ซ๏ธ๐ฅถ๐ฐ๐ฐ๐คซ๐คซ๐๐คฏ๐คฏ๐คฏ Ooiggvklpoure๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คซ๐๐คฌ๐คฏ๐คฏ๐คฌ๐คฌ๐๐๐๐๐๐๐ฅธ๐คฉ๐ฅณ๐๐๐ฅบ๐ฉ๐ฉ๐คฉ๐ฅณ๐ฅณ๐๐๐ฃ๐๐ฉโน๏ธ๐๐ซ๐ค๐ญ๐คฌ๐คฉ๐คฉ๐ฅธ๐๐๐ฉ๐ก๐ต๐ช๐ง๐คฅ๐คฅ๐ฏ๐ต๐คฎ๐ฌ๐คฅ๐๐ค๐ค๐ถ๐ฒ๐คค๐ค๐ค๐ค๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ค๐ผ๐ฝโ ๏ธ๐๐๐ป๐ป๐ป๐น๐น๐บ๐ฝ๐ฝ๐๐๐ป๐๐๐โ ๏ธโ ๏ธโ ๏ธโ ๏ธ Sent from my iPhone > On Jul 25, 2022, at 1:04 AM, Vanessa Page <Vebpe@outlook.com> wrote: > > ๏ปฟ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐๐๐๐๐๐๐๐๐โบ๏ธโบ๏ธโบ๏ธโบ๏ธโบ๏ธ๐๐๐๐๐๐๐ฅฐ๐๐๐๐๐๐๐โบ๏ธโบ๏ธโบ๏ธ๐๐๐๐ฅฐ๐ฅฐ๐โบ๏ธโบ๏ธ๐๐ฅฐ๐โบ๏ธ๐๐ฅฐ๐โบ๏ธโบ๏ธ๐๐ฅฐ๐ฅฐ๐โบ๏ธโบ๏ธ๐ > > Sent from my iPhonโ๏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/
You lame ass stalking motherfucker. You are committing a crime and I have reported you to the police. Koop๐๐๐๐๐๐๐๐๐ด๐ด๐๐๐๐๐๐๐๐๐๐๐๐๐๐ณ๐๐ด๐๐๐๐๐คฃ๐คฃ๐๐๐๐ด๐๐คฅ๐คซ๐ฅ๐ฐ๐ฅต๐ฅต๐ก๐ก๐คฌ๐คฏ๐ญ๐ญ๐๐๐ฅณ๐คฉ๐ฅธ๐ฅธ๐ฅธ๐๐ฉ๐ฅบโน๏ธ๐ฃ๐๐๐๐๐ฃ๐ข๐ก๐ฅถ๐ฐ๐ฐ๐ฅ๐ฅ๐ถโ๐ซ๏ธ๐คฌ๐คฌ๐คฌ๐คฏ๐ถโ๐ซ๏ธ๐ฅถ๐ฐ๐ฐ๐คซ๐คซ๐๐คฏ๐คฏ๐คฏ Ooiggvklpoure๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คซ๐๐คฌ๐คฏ๐คฏ๐คฌ๐คฌ๐๐๐๐๐๐๐ฅธ๐คฉ๐ฅณ๐๐๐ฅบ๐ฉ๐ฉ๐คฉ๐ฅณ๐ฅณ๐๐๐ฃ๐๐ฉโน๏ธ๐๐ซ๐ค๐ญ๐คฌ๐คฉ๐คฉ๐ฅธ๐๐๐ฉ๐ก๐ต๐ช๐ง๐คฅ๐คฅ๐ฏ๐ต๐คฎ๐ฌ๐คฅ๐๐ค๐ค๐ถ๐ฒ๐คค๐ค๐ค๐ค๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ค๐ผ๐ฝโ ๏ธ๐๐๐ป๐ป๐ป๐น๐น๐บ๐ฝ๐ฝ๐๐๐ป๐๐๐โ ๏ธโ ๏ธโ ๏ธโ ๏ธ > On Jul 25, 2022, at 1:04 AM, Vanessa Page <Vebpe@outlook.com> wrote: > > ๏ปฟ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐๐๐๐๐๐๐๐๐โบ๏ธโบ๏ธโบ๏ธโบ๏ธโบ๏ธ๐๐๐๐๐๐๐ฅฐ๐๐๐๐๐๐๐โบ๏ธโบ๏ธโบ๏ธ๐๐๐๐ฅฐ๐ฅฐ๐โบ๏ธโบ๏ธ๐๐ฅฐ๐โบ๏ธ๐๐ฅฐ๐โบ๏ธโบ๏ธ๐๐ฅฐ๐ฅฐ๐โบ๏ธโบ๏ธ๐ > > Sent from my iPhonโ๏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/
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. > > Koop๐๐๐๐๐๐๐๐๐ด๐ด๐๐๐๐๐๐๐๐๐๐๐๐๐๐ณ๐๐ด๐๐๐๐๐คฃ๐คฃ๐๐๐๐ด๐๐คฅ๐คซ๐ฅ๐ฐ๐ฅต๐ฅต๐ก๐ก๐คฌ๐คฏ๐ญ๐ญ๐๐๐ฅณ๐คฉ๐ฅธ๐ฅธ๐ฅธ๐๐ฉ๐ฅบโน๏ธ๐ฃ๐๐๐๐๐ฃ๐ข๐ก๐ฅถ๐ฐ๐ฐ๐ฅ๐ฅ๐ถโ๐ซ๏ธ๐คฌ๐คฌ๐คฌ๐คฏ๐ถโ๐ซ๏ธ๐ฅถ๐ฐ๐ฐ๐คซ๐คซ๐๐คฏ๐คฏ๐คฏ > Ooiggvklpoure๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฌ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คฏ๐คซ๐๐คฌ๐คฏ๐คฏ๐คฌ๐คฌ๐๐๐๐๐๐๐ฅธ๐คฉ๐ฅณ๐๐๐ฅบ๐ฉ๐ฉ๐คฉ๐ฅณ๐ฅณ๐๐๐ฃ๐๐ฉโน๏ธ๐๐ซ๐ค๐ญ๐คฌ๐คฉ๐คฉ๐ฅธ๐๐๐ฉ๐ก๐ต๐ช๐ง๐คฅ๐คฅ๐ฏ๐ต๐คฎ๐ฌ๐คฅ๐๐ค๐ค๐ถ๐ฒ๐คค๐ค๐ค๐ค๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ตโ๐ซ๐ค๐ผ๐ฝโ ๏ธ๐๐๐ป๐ป๐ป๐น๐น๐บ๐ฝ๐ฝ๐๐๐ป๐๐๐โ ๏ธโ ๏ธโ ๏ธโ ๏ธ > >> On Jul 25, 2022, at 1:04 AM, Vanessa Page <Vebpe@outlook.com> wrote: >> >> ๏ปฟ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐๐๐๐๐๐๐๐๐โบ๏ธโบ๏ธโบ๏ธโบ๏ธโบ๏ธ๐๐๐๐๐๐๐ฅฐ๐๐๐๐๐๐๐โบ๏ธโบ๏ธโบ๏ธ๐๐๐๐ฅฐ๐ฅฐ๐โบ๏ธโบ๏ธ๐๐ฅฐ๐โบ๏ธ๐๐ฅฐ๐โบ๏ธโบ๏ธ๐๐ฅฐ๐ฅฐ๐โบ๏ธโบ๏ธ๐ >> >> Sent from my iPhonโ๏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 --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); }