On Fri, Nov 29, 2013 at 03:25:31PM +0900, Kazuya Mio wrote:
> Ping?
> Any comments/suggestions will be welcome.
I /think/ it looks fine...
--D
>
> Regards,
> Kazuya Mio
>
> > 2013/11/07 15:18:05, k-mio@xxxxxxxxxxxxx wrote:
> >
> > When /etc/mtab is a symlink of /proc/mounts, mke2fs without -FF option
> > can create a filesystem on the image file that is mounted.
> > According to mke2fs man page, we should specify -FF option in this case.
> >
> > This patch protects filesystem from unintended mke2fs caused by human error.
> >
> > How to reproduce:
> > # mke2fs -t ext4 -Fq fs.img
> > # mount -o loop fs.img /mnt/mp1
> > # mke2fs -t ext4 -Fq fs.img && echo "mke2fs success"
> > mke2fs success
> >
> > Signed-off-by: Kazuya Mio <k-mio@xxxxxxxxxxxxx>
> > ---
> > configure.in | 1 +
> > lib/ext2fs/ismounted.c | 41 +++++++++++++++++++++++++++++++++++++++++
> > 2 files changed, 42 insertions(+)
> > diff --git a/configure.in b/configure.in
> > index 049dc11..fef8d9b 100644
> > --- a/configure.in
> > +++ b/configure.in
> > @@ -920,6 +920,7 @@ AC_CHECK_HEADERS(m4_flatten([
> > linux/falloc.h
> > linux/fd.h
> > linux/major.h
> > + linux/loop.h
> > net/if_dl.h
> > netinet/in.h
> > sys/disklabel.h
> > diff --git a/lib/ext2fs/ismounted.c b/lib/ext2fs/ismounted.c
> > index 2c1bd75..6c6ecff 100644
> > --- a/lib/ext2fs/ismounted.c
> > +++ b/lib/ext2fs/ismounted.c
> > @@ -21,6 +21,13 @@
> > #ifdef HAVE_LINUX_FD_H
> > #include <linux/fd.h>
> > #endif
> > +#ifdef HAVE_LINUX_LOOP_H
> > +#include <linux/loop.h>
> > +#include <sys/ioctl.h>
> > +#ifdef HAVE_LINUX_MAJOR_H
> > +#include <linux/major.h>
> > +#endif /* HAVE_LINUX_MAJOR_H */
> > +#endif /* HAVE_LINUX_LOOP_H */
> > #ifdef HAVE_MNTENT_H
> > #include <mntent.h>
> > #endif
> > @@ -35,6 +42,36 @@
> > #include "ext2_fs.h"
> > #include "ext2fs.h"
> >
> > +/*
> > + * Check to see if a regular file is mounted.
> > + * If /etc/mtab/ is a symlink of /proc/mounts, you will need the following check
> > + * because the name in /proc/mounts is a loopback device not a regular file.
> > + */
> > +static int check_loop_mounted(const char *mnt_fsname, dev_t mnt_rdev,
> > + dev_t file_dev, ino_t file_ino)
> > +{
> > +#if defined(HAVE_LINUX_LOOP_H) && defined(HAVE_LINUX_MAJOR_H)
> > + struct loop_info64 loopinfo;
> > + int loop_fd, ret;
> > +
> > + if (major(mnt_rdev) == LOOP_MAJOR) {
> > + loop_fd = open(mnt_fsname, O_RDONLY);
> > + if (loop_fd < 0)
> > + return -1;
> > +
> > + ret = ioctl(loop_fd, LOOP_GET_STATUS64, &loopinfo);
> > + close(loop_fd);
> > + if (ret < 0)
> > + return -1;
> > +
> > + if (file_dev == loopinfo.lo_device &&
> > + file_ino == loopinfo.lo_inode)
> > + return 1;
> > + }
> > +#endif /* defined(HAVE_LINUX_LOOP_H) && defined(HAVE_LINUX_MAJOR_H) */
> > + return 0;
> > +}
> > +
> > #ifdef HAVE_SETMNTENT
> > /*
> > * Helper function which checks a file in /etc/mtab format to see if a
> > @@ -82,6 +119,10 @@ static errcode_t check_mntent_file(const char *mtab_file, const char *file,
> > #ifndef __GNU__
> > if (file_rdev && (file_rdev == st_buf.st_rdev))
> > break;
> > + if (check_loop_mounted(mnt->mnt_fsname,
> > + st_buf.st_rdev, file_dev,
> > + file_ino) == 1)
> > + break;
> > #endif /* __GNU__ */
> > } else {
> > if (file_dev && ((file_dev == st_buf.st_dev) &&
> > --
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