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SubjectRe: BUG? atleast >=2.6.19-rc5, x86 chroot on x86_64
In-Reply-To: <20061204192018.2a61814f.akpm@osdl.org>

On Mon, 4 Dec 2006 19:20:18 -0800, Andrew Morton wrote:

> On Tue, 05 Dec 2006 03:36:09 +0100
> Kasper Sandberg <lkml@metanurb.dk> wrote:
>
> > i know i said i suspected this was another bug, but i have revised my
> > suspecisions, and i do believe its in relation to x86 chroot on x86_64
> > install, as it has happened with more stuff now, inside the chroot, and
> > only inside the chroot, while the same apps dont do it outside chroot.
> >
> > 2.6.19 release is affected too

> > > > ioctl32(regedit.exe:11801): Unknown cmd fd(9) cmd(82187201){02}
> > > > arg(00221000) on /home/redeeman
> > > > ioctl32(regedit.exe:11801): Unknown cmd fd(9) cmd(82187201){02}
> > > > arg(00221000) on /home/redeeman/.wine/drive_c/windows/system32

> Possibly some ioctl got removed. I don't know why it would only occur
> within a chrooted environment.
>
> Possibly one could work out what's going on by reverse-engineering x86_64
> ioctl command 0x82187201, but unfortunately I don't have time to do that.

That is VFAT_IOCTL_READDIR_BOTH32

This patch:
[PATCH] BLOCK: Move the msdos device ioctl
compat stuff to the msdos driver [try #6]

may have caused this.

Here is a patch to reverse that. Kasper, can you test it?
(Your filesystem is on a FAT/VFAT volume, I assume.)


[Revert] [PATCH] BLOCK: Move the msdos device ioctl compat stuff to the msdos driver [try #6]

Reverts:

Move the msdos device ioctl compat stuff from fs/compat_ioctl.c to the msdos
driver so that the msdos header file doesn't need to be included.

Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

committer: Jens Axboe <axboe@nelson.home.kernel.dk> 1159642350 +0200


fs/compat_ioctl.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++
fs/fat/dir.c | 56 ------------------------------------------------------
2 files changed, 49 insertions(+), 56 deletions(-)

--- 2.6.19.0.2-32.orig/fs/compat_ioctl.c
+++ 2.6.19.0.2-32/fs/compat_ioctl.c
@@ -107,6 +107,7 @@
#include <linux/nbd.h>
#include <linux/random.h>
#include <linux/filter.h>
+#include <linux/msdos_fs.h>
#include <linux/pktcdvd.h>

#include <linux/hiddev.h>
@@ -1945,6 +1946,51 @@ static int mtd_rw_oob(unsigned int fd, u
return err;
}

+#define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2])
+#define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2])
+
+static long
+put_dirent32 (struct dirent *d, struct compat_dirent __user *d32)
+{
+ if (!access_ok(VERIFY_WRITE, d32, sizeof(struct compat_dirent)))
+ return -EFAULT;
+
+ __put_user(d->d_ino, &d32->d_ino);
+ __put_user(d->d_off, &d32->d_off);
+ __put_user(d->d_reclen, &d32->d_reclen);
+ if (__copy_to_user(d32->d_name, d->d_name, d->d_reclen))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int vfat_ioctl32(unsigned fd, unsigned cmd, unsigned long arg)
+{
+ struct compat_dirent __user *p = compat_ptr(arg);
+ int ret;
+ mm_segment_t oldfs = get_fs();
+ struct dirent d[2];
+
+ switch(cmd)
+ {
+ case VFAT_IOCTL_READDIR_BOTH32:
+ cmd = VFAT_IOCTL_READDIR_BOTH;
+ break;
+ case VFAT_IOCTL_READDIR_SHORT32:
+ cmd = VFAT_IOCTL_READDIR_SHORT;
+ break;
+ }
+
+ set_fs(KERNEL_DS);
+ ret = sys_ioctl(fd,cmd,(unsigned long)&d);
+ set_fs(oldfs);
+ if (ret >= 0) {
+ ret |= put_dirent32(&d[0], p);
+ ret |= put_dirent32(&d[1], p + 1);
+ }
+ return ret;
+}
+
#ifdef CONFIG_BLOCK
struct raw32_config_request
{
@@ -2513,6 +2559,9 @@ HANDLE_IOCTL(SONET_GETFRSENSE, do_atm_io
HANDLE_IOCTL(BLKBSZGET_32, do_blkbszget)
HANDLE_IOCTL(BLKBSZSET_32, do_blkbszset)
HANDLE_IOCTL(BLKGETSIZE64_32, do_blkgetsize64)
+/* vfat */
+HANDLE_IOCTL(VFAT_IOCTL_READDIR_BOTH32, vfat_ioctl32)
+HANDLE_IOCTL(VFAT_IOCTL_READDIR_SHORT32, vfat_ioctl32)
/* Raw devices */
HANDLE_IOCTL(RAW_SETBIND, raw_ioctl)
HANDLE_IOCTL(RAW_GETBIND, raw_ioctl)
--- 2.6.19.0.2-32.orig/fs/fat/dir.c
+++ 2.6.19.0.2-32/fs/fat/dir.c
@@ -20,7 +20,6 @@
#include <linux/dirent.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
-#include <linux/compat.h>
#include <asm/uaccess.h>

static inline loff_t fat_make_i_pos(struct super_block *sb,
@@ -742,65 +741,10 @@ static int fat_dir_ioctl(struct inode *
return ret;
}

-#ifdef CONFIG_COMPAT
-#define VFAT_IOCTL_READDIR_BOTH32 _IOR('r', 1, struct compat_dirent[2])
-#define VFAT_IOCTL_READDIR_SHORT32 _IOR('r', 2, struct compat_dirent[2])
-
-static long fat_compat_put_dirent32(struct dirent *d,
- struct compat_dirent __user *d32)
-{
- if (!access_ok(VERIFY_WRITE, d32, sizeof(struct compat_dirent)))
- return -EFAULT;
-
- __put_user(d->d_ino, &d32->d_ino);
- __put_user(d->d_off, &d32->d_off);
- __put_user(d->d_reclen, &d32->d_reclen);
- if (__copy_to_user(d32->d_name, d->d_name, d->d_reclen))
- return -EFAULT;
-
- return 0;
-}
-
-static long fat_compat_dir_ioctl(struct file *file, unsigned cmd,
- unsigned long arg)
-{
- struct compat_dirent __user *p = compat_ptr(arg);
- int ret;
- mm_segment_t oldfs = get_fs();
- struct dirent d[2];
-
- switch (cmd) {
- case VFAT_IOCTL_READDIR_BOTH32:
- cmd = VFAT_IOCTL_READDIR_BOTH;
- break;
- case VFAT_IOCTL_READDIR_SHORT32:
- cmd = VFAT_IOCTL_READDIR_SHORT;
- break;
- default:
- return -ENOIOCTLCMD;
- }
-
- set_fs(KERNEL_DS);
- lock_kernel();
- ret = fat_dir_ioctl(file->f_dentry->d_inode, file,
- cmd, (unsigned long) &d);
- unlock_kernel();
- set_fs(oldfs);
- if (ret >= 0) {
- ret |= fat_compat_put_dirent32(&d[0], p);
- ret |= fat_compat_put_dirent32(&d[1], p + 1);
- }
- return ret;
-}
-#endif /* CONFIG_COMPAT */
-
const struct file_operations fat_dir_operations = {
.read = generic_read_dir,
.readdir = fat_readdir,
.ioctl = fat_dir_ioctl,
-#ifdef CONFIG_COMPAT
- .compat_ioctl = fat_compat_dir_ioctl,
-#endif
.fsync = file_fsync,
};

--
Chuck
"Even supernovas have their duller moments."
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