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| author |   J. Bruce Fields <bfields@redhat.com> | 2014-02-03 12:13:08 -0500 |
|---|---|---|
| committer |   Jeff Layton <jlayton@redhat.com> | 2014-03-31 08:24:42 -0400 |
| commit | ef12e72a01f3022c55e5a8e0fa1caebdc7efcfce (patch) | |
| tree | 54209e0731082ff7e2a36ede9b045d415132134e /include/uapi/asm-generic/fcntl.h | |
| parent | locks: eliminate BUG() call when there's an unexpected lock on file close (diff) | |
| download | linux-dev-ef12e72a01f3022c55e5a8e0fa1caebdc7efcfce.tar.xz linux-dev-ef12e72a01f3022c55e5a8e0fa1caebdc7efcfce.zip | |
locks: fix posix lock range overflow handling
In the 32-bit case fcntl assigns the 64-bit f_pos and i_size to a 32-bit
off_t.
The existing range checks also seem to depend on signed arithmetic
wrapping when it overflows. In practice maybe that works, but we can be
more careful. That also allows us to make a more reliable distinction
between -EINVAL and -EOVERFLOW.
Note that in the 32-bit case SEEK_CUR or SEEK_END might allow the caller
to set a lock with starting point no longer representable as a 32-bit
value. We could return -EOVERFLOW in such cases, but the locks code is
capable of handling such ranges, so we choose to be lenient here. The
only problem is that subsequent GETLK calls on such a lock will fail
with EOVERFLOW.
While we're here, do some cleanup including consolidating code for the
flock and flock64 cases.
Signed-off-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Diffstat (limited to 'include/uapi/asm-generic/fcntl.h')
| -rw-r--r-- | include/uapi/asm-generic/fcntl.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/include/uapi/asm-generic/fcntl.h b/include/uapi/asm-generic/fcntl.h index 95e46c8e05f9..36025f77c6ed 100644 --- a/include/uapi/asm-generic/fcntl.h +++ b/include/uapi/asm-generic/fcntl.h @@ -186,8 +186,6 @@ struct flock { }; #endif -#ifndef CONFIG_64BIT - #ifndef HAVE_ARCH_STRUCT_FLOCK64 #ifndef __ARCH_FLOCK64_PAD #define __ARCH_FLOCK64_PAD @@ -202,6 +200,5 @@ struct flock64 { __ARCH_FLOCK64_PAD }; #endif -#endif /* !CONFIG_64BIT */ #endif /* _ASM_GENERIC_FCNTL_H */ |