compat: sync compat_stats with statfs.

This was found by inspection while tracking a similar
bug in compat_statfs64, that has been fixed in mainline
since decemeber.

- This fixes a bug where not all of the f_spare fields
  were cleared on mips and s390.
- Add the f_flags field to struct compat_statfs
- Copy f_flags to userspace in case someone cares.
- Use __clear_user to copy the f_spare field to userspace
  to ensure that all of the elements of f_spare are cleared.
  On some architectures f_spare is has 5 ints and on some
  architectures f_spare only has 4 ints.  Which makes
  the previous technique of clearing each int individually
  broken.

I don't expect anyone actually uses the old statfs system
call anymore but if they do let them benefit from having
the compat and the native version working the same.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/arch/mips/include/asm/compat.h b/arch/mips/include/asm/compat.h
index dbc5106..b77df03 100644 (file)
--- a/arch/mips/include/asm/compat.h
+++ b/arch/mips/include/asm/compat.h
@@ -111,7 +111,8 @@ struct compat_statfs {
        int             f_bavail;
        compat_fsid_t   f_fsid;
        int             f_namelen;
-       int             f_spare[6];
+       int             f_flags;
+       int             f_spare[5];
 };
 
 #define COMPAT_RLIM_INFINITY   0x7fffffffUL

diff --git a/arch/parisc/include/asm/compat.h b/arch/parisc/include/asm/compat.h
index efa0b60..760f331 100644 (file)
--- a/arch/parisc/include/asm/compat.h
+++ b/arch/parisc/include/asm/compat.h
@@ -105,7 +105,8 @@ struct compat_statfs {
        __kernel_fsid_t f_fsid;
        s32             f_namelen;
        s32             f_frsize;
-       s32             f_spare[5];
+       s32             f_flags;
+       s32             f_spare[4];
 };
 
 struct compat_sigcontext {

diff --git a/arch/powerpc/include/asm/compat.h b/arch/powerpc/include/asm/compat.h
index 91010e8..88e602f 100644 (file)
--- a/arch/powerpc/include/asm/compat.h
+++ b/arch/powerpc/include/asm/compat.h
@@ -100,7 +100,8 @@ struct compat_statfs {
        compat_fsid_t   f_fsid;
        int             f_namelen;      /* SunOS ignores this field. */
        int             f_frsize;
-       int             f_spare[5];
+       int             f_flags;
+       int             f_spare[4];
 };
 
 #define COMPAT_RLIM_OLD_INFINITY       0x7fffffff

diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h
index da359ca..cdb9b78 100644 (file)
--- a/arch/s390/include/asm/compat.h
+++ b/arch/s390/include/asm/compat.h
@@ -131,7 +131,8 @@ struct compat_statfs {
        compat_fsid_t   f_fsid;
        s32             f_namelen;
        s32             f_frsize;
-       s32             f_spare[6];
+       s32             f_flags;
+       s32             f_spare[5];
 };
 
 #define COMPAT_RLIM_OLD_INFINITY       0x7fffffff

diff --git a/arch/sparc/include/asm/compat.h b/arch/sparc/include/asm/compat.h
index 6f57325..b8be20d 100644 (file)
--- a/arch/sparc/include/asm/compat.h
+++ b/arch/sparc/include/asm/compat.h
@@ -134,7 +134,8 @@ struct compat_statfs {
        compat_fsid_t   f_fsid;
        int             f_namelen;      /* SunOS ignores this field. */
        int             f_frsize;
-       int             f_spare[5];
+       int             f_flags;
+       int             f_spare[4];
 };
 
 #define COMPAT_RLIM_INFINITY 0x7fffffff

diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h
index 1d9cd27..30d737e 100644 (file)
--- a/arch/x86/include/asm/compat.h
+++ b/arch/x86/include/asm/compat.h
@@ -108,7 +108,8 @@ struct compat_statfs {
        compat_fsid_t   f_fsid;
        int             f_namelen;      /* SunOS ignores this field. */
        int             f_frsize;
-       int             f_spare[5];
+       int             f_flags;
+       int             f_spare[4];
 };
 
 #define COMPAT_RLIM_OLD_INFINITY       0x7fffffff

diff --git a/fs/compat.c b/fs/compat.c
index 58b1da4..0f1ab46 100644 (file)
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -247,11 +247,8 @@ static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *
            __put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
            __put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
            __put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
-           __put_user(0, &ubuf->f_spare[0]) || 
-           __put_user(0, &ubuf->f_spare[1]) || 
-           __put_user(0, &ubuf->f_spare[2]) || 
-           __put_user(0, &ubuf->f_spare[3]) || 
-           __put_user(0, &ubuf->f_spare[4]))
+           __put_user(kbuf->f_flags, &ubuf->f_flags) ||
+           __clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
                return -EFAULT;
        return 0;
 }