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Date: Tue, 12 Jun 2018 21:43:26 +0300
From: Anatoly Trosinenko <anatoly.trosinenko@...il.com>
To: pavel@....cz,
"Ernesto A. Fernandez" <ernesto.mnd.fernandez@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Subject: Re: Mounting corrupted HFS+ causes kernel NULL pointer dereference
Hello,
> [1] https://www.spinics.net/lists/linux-fsdevel/msg125241.html
> [2] https://www.spinics.net/lists/linux-fsdevel/msg126499.html
If I get it right, the first patch is already upstreamed in some
modified form and cannot be applied on top of vanilla v4.17. When I
apply the second one I get
$ patch -p1 < ../hfsplus-2.patch
patching file fs/hfsplus/dir.c
patching file fs/hfsplus/hfsplus_fs.h
patching file fs/hfsplus/inode.c
patching file fs/hfsplus/super.c
Hunk #3 FAILED at 567.
Hunk #4 succeeded at 586 (offset 1 line).
1 out of 4 hunks FAILED -- saving rejects to file fs/hfsplus/super.c.rej
$ cat fs/hfsplus/super.c.rej
--- fs/hfsplus/super.c
+++ fs/hfsplus/super.c
@@ -567,11 +547,6 @@ static int hfsplus_fill_super(struct super_block
*sb, void *data, int silent)
sbi->nls = nls;
return 0;
-out_put_hidden_dir:
- iput(sbi->hidden_dir);
-out_put_root:
- dput(sb->s_root);
- sb->s_root = NULL;
out_put_alloc_file:
iput(sbi->alloc_file);
out_close_attr_tree:
Looks, like manually removing this hunk cannot change anything
(because of previous return), so just left as is.
Now, when mounting the attached hfsplus_16mb_segv to /mnt and
performing `dd if=/dev/zero of=/mnt/xyz bs=567879 count=1` I get
[ 1.646451] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000043
[ 1.646666] PGD 1d4d2067 P4D 1d4d2067 PUD 1d4bc067 PMD 0
[ 1.646870] Oops: 0000 [#1] SMP NOPTI
[ 1.647002] Modules linked in:
[ 1.647209] CPU: 0 PID: 991 Comm: init Not tainted 4.17.0+ #1
[ 1.647291] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.10.2-1ubuntu1 04/01/2014
[ 1.647456] RIP: 0010:hfsplus_bnode_put+0x9/0xc0
[ 1.647522] RSP: 0018:ffffb750409b7a58 EFLAGS: 00000282
[ 1.647607] RAX: ffffa3b31e713000 RBX: 000000000a000000 RCX: 0000000011000000
[ 1.647696] RDX: 0000000000000000 RSI: ffffffff85ca56d0 RDI: fffffffffffffffb
[ 1.647787] RBP: ffffa3b31d473288 R08: 0000000000000000 R09: ffffb750409b7960
[ 1.647877] R10: 0000000000000000 R11: ffffa3b31df0e618 R12: ffffb750409b7ad0
[ 1.647967] R13: ffffa3b31d473180 R14: ffffa3b31d432a00 R15: 000000000000000a
[ 1.648089] FS: 0000000001dd48c0(0000) GS:ffffa3b31f800000(0000)
knlGS:0000000000000000
[ 1.648192] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1.648268] CR2: 0000000000000043 CR3: 000000001d4c4000 CR4: 00000000000006f0
[ 1.648406] Call Trace:
[ 1.648883] hfsplus_brec_find+0x3c/0x150
[ 1.648970] ? hfsplus_brec_remove+0x160/0x160
[ 1.649037] hfsplus_ext_read_extent.part.6+0xba/0x190
[ 1.649118] ? clean_bdev_aliases+0x81/0x1d0
[ 1.649178] hfsplus_file_extend+0x16b/0x3a0
[ 1.649238] hfsplus_get_block+0x60/0x250
[ 1.649293] ? hfsplus_file_extend+0x3a0/0x3a0
[ 1.649352] __block_write_begin_int+0x134/0x550
[ 1.649414] ? hfsplus_file_extend+0x3a0/0x3a0
[ 1.649476] ? percpu_counter_add_batch+0x48/0x60
[ 1.649537] ? hfsplus_file_extend+0x3a0/0x3a0
[ 1.649596] block_write_begin+0x3f/0xa0
[ 1.649652] cont_write_begin+0x232/0x330
[ 1.649713] ? hfsplus_file_extend+0x3a0/0x3a0
[ 1.649776] hfsplus_write_begin+0x2f/0x70
[ 1.649834] ? hfsplus_file_extend+0x3a0/0x3a0
[ 1.649902] generic_perform_write+0xb1/0x1b0
[ 1.649965] __generic_file_write_iter+0xfd/0x190
[ 1.650031] generic_file_write_iter+0xe1/0x1e0
[ 1.650095] __vfs_write+0xfc/0x160
[ 1.650148] vfs_write+0xa8/0x190
[ 1.650196] ksys_write+0x4d/0xb0
[ 1.650245] do_syscall_64+0x43/0xf0
[ 1.650301] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 1.650465] RIP: 0033:0x486804
[ 1.650510] RSP: 002b:00007ffd156ba4e8 EFLAGS: 00000246 ORIG_RAX:
0000000000000001
[ 1.650611] RAX: ffffffffffffffda RBX: 0000000001dd48a0 RCX: 0000000000486804
[ 1.650695] RDX: 000000000008aa47 RSI: 00007ff996f60010 RDI: 0000000000000001
[ 1.650779] RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000a
[ 1.650863] R10: 00000000000001b6 R11: 0000000000000246 R12: 00007ff996f60010
[ 1.650946] R13: 000000000008aa47 R14: 00007ff996f60010 R15: 0000000000000000
[ 1.651058] Code: 39 5a 68 77 ce 48 89 ef 5b 5d e9 03 c7 ef ff 0f
1f 00 48 85 ff 74 04 3e ff 47 48 f3 c3 0f 1f 44 00 00 48 85 ff 74 5b
41 54 55 53 <8b> 47 48 48 8b 2f 85 c0 0f 84 89 00 00 00 49 89 fc 48 8d
75 6c
[ 1.651492] RIP: hfsplus_bnode_put+0x9/0xc0 RSP: ffffb750409b7a58
[ 1.651583] CR2: 0000000000000043
[ 1.651851] ---[ end trace d164982d45c0eb53 ]---
(full log attached)
And when I mount hfsplus_16mb_hang and perform `echo > /mnt/xyz`, it hangs.
PS: Please excuse me, if these patches just became slightly outdated
and I didn't managed to apply them properly.
пт, 8 июн. 2018 г. в 18:25, Pavel Machek <pavel@....cz>:
>
> On Sun 2018-06-03 15:49:56, Ernesto A. Fernández wrote:
> 1;2802;0c> Hi, thank you for your report.
> >
> > On Sun, Jun 03, 2018 at 06:52:19PM +0300, Anatoly Trosinenko wrote:
> > > How to reproduce:
> > > 1. Take kernel source v4.17-rc7
> > > 2. Compile it with the config attached
> > > 3. Unpack and mount the attached FS image as hfsplus.
> >
> > We are aware of this issue and I've sent some patches [1][2]. It's hard
> > to get reviewers interested in hfsplus, so I don't know when it will be
> > fixed.
>
> I guess Anatoly can still test the patches, and add Tested-by tags if
> they help. No guarantees, but that may make it easier to get the patches
> merged.
>
> Thanks,
> Pavel
>
> > [1] https://www.spinics.net/lists/linux-fsdevel/msg125241.html
> > [2] https://www.spinics.net/lists/linux-fsdevel/msg126499.html
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
С уважением,
Анатолий Тросиненко
e-mail: anatoly.trosinenko@...il.com
View attachment "serial-log-2.txt" of type "text/plain" (22292 bytes)
Download attachment "hfsplus_16mb_segv.bz2" of type "application/octet-stream" (58916 bytes)
Download attachment "hfsplus_16mb_hang.bz2" of type "application/octet-stream" (58680 bytes)
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