[v2] Fix Linux fcntl OFD locks for non-LFS architectures (BZ#20251)

Message ID 1528117924-7897-1-git-send-email-adhemerval.zanella@linaro.org
State New
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  • [v2] Fix Linux fcntl OFD locks for non-LFS architectures (BZ#20251)
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Commit Message

Adhemerval Zanella June 4, 2018, 1:12 p.m.
Changes from previous versions:

  - Added overflow checks along with a testcase for non-LFS version.

  - Do not set F_SETLKW, F_GETLK64, F_OFD_GETLK, F_SETLK64, or
    F_OFD_SETLK as a cancellation point.

  - Do not interpret the argument as struct flock64 for F_GETLK64 and
    F_SETLK64 on non-LFS mode.

---

This patch fixes the OFD ("file private") locks for architectures that
support non-LFS flock definition (__USE_FILE_OFFSET64 not defined). The
issue in this case is both F_OFD_{GETLK,SETLK,SETLKW} and
F_{SET,GET}L{W}K64 expects a flock64 argument and when using old F_OFD_*
flags with a non LFS flock argument the kernel might interpret the underlying
data wrongly.  Kernel idea originally was to avoid using such flags in
non-LFS syscall, but since GLIBC uses fcntl with LFS semantic as default
it is possible to provide the functionality and avoid the bogus struct kernel
passing by adjusting the struct manually for the required flags.

The idea follows other LFS interfaces that provide two symbols:

  1. A new LFS fcntl64 is added on default ABI with the usual macros to select
     it for FILE_OFFSET_BITS=64.

  2. The Linux non-LFS fcntl use a stack allocated struct flock64 for
     F_OFD_{GETLK,SETLK,SETLKW} copy the results on the user provided struct.

  3. Keep a compat symbol with old broken semantic for architectures that do
     not define __OFF_T_MATCHES_OFF64_T.

So for architectures which defines __USE_FILE_OFFSET64, fcntl64 will aliased
to fcntl and no adjustment would be required.

Also F_OFD_SETLKW command is handled a cancellation point, as for L_SETLKW{64}.

Checked on x86_64-linux-gnu and i686-linux-gnu.

	[BZ #20251]
	* include/fcntl.h (__libc_fcntl64, __fcntl64): New prototype.
	* io/Makefile (routines): Add fcntl64.
	(CFLAGS-fcntl64.c): New rule.
	* io/fcntl.h (fcntl64): Add prototype and redirect if
	__USE_FILE_OFFSET64 is defined.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/fcntl.c: Remove file.
	* io/fcntl64.c: New file.
	* nptl/Makefile (pthread-compat-wrappers): Add fcntl64.
	(CFLAGS-fcntl64.c): New rule.
	* sysdeps/mach/hurd/fcntl.c: Alias fcntl to fcntl64 symbols.
	* io/Versions [GLIBC_2.28] (fcntl64): New symbol.
	* sysdeps/unix/sysv/linux/fcntl.c (__libc_fcntl): Fix F_GETLK64,
	F_OFD_GETLK, F_SETLK64, F_SETLKW64, F_OFD_SETLK, and F_OFD_SETLKW for
	non-LFS case.
	(fcntl_common, __fcntl_nocancel): Remove function.
	(flock_to_flock64): New function.
	* sysdeps/unix/sysv/linux/fcntl64.c: New file.
	* sysdeps/unix/sysv/linux/powerpc/kernel-features.h
	(FCNTL_ADJUST_CMD): New macro.
	* sysdeps/unix/sysv/linux/Makefile (tests): Add tst-ofdlocks.
	* sysdeps/unix/sysv/linux/tst-ofdlocks.c: New file.
	* sysdeps/mach/hurd/i386/libc.abilist [GLIBC_2.28] (fcntl, fcntl64):
	New symbols.
	* sysdeps/unix/sysv/linux/hppa/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/arm/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/microblaze/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/i386/libc.abilis: Likewise.
	* sysdeps/unix/sysv/linux/nios2/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist:
	Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sh/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/aarch64/libc.abilist [GLIBC_2.28]
	(fcntl64): New symbol.
	* sysdeps/unix/sysv/linux/alpha/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/ia64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist: Likewise.
	* sysdeps/sysv/linux/powerpc/powerpc64/libc-le.abilist: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/64/libc.abilist: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist: Likewise.
---
 ChangeLog                                          |  59 +++++++++++
 NEWS                                               |   5 +
 include/fcntl.h                                    |   4 +
 io/Makefile                                        |   3 +-
 io/Versions                                        |   3 +
 io/fcntl.h                                         |  11 ++
 .../powerpc/powerpc64/fcntl.c => io/fcntl64.c      |  28 +++--
 manual/llio.texi                                   |  13 +--
 nptl/Makefile                                      |   3 +-
 sysdeps/mach/hurd/fcntl.c                          |   5 +
 sysdeps/mach/hurd/i386/libc.abilist                |   2 +
 sysdeps/unix/sysv/linux/Makefile                   |   2 +-
 sysdeps/unix/sysv/linux/aarch64/libc.abilist       |   1 +
 sysdeps/unix/sysv/linux/alpha/libc.abilist         |   1 +
 sysdeps/unix/sysv/linux/arm/libc.abilist           |   2 +
 sysdeps/unix/sysv/linux/fcntl.c                    | 116 ++++++++++++++-------
 sysdeps/unix/sysv/linux/fcntl64.c                  |  99 ++++++++++++++++++
 sysdeps/unix/sysv/linux/hppa/libc.abilist          |   2 +
 sysdeps/unix/sysv/linux/i386/libc.abilist          |   2 +
 sysdeps/unix/sysv/linux/ia64/libc.abilist          |   1 +
 sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist |   2 +
 sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist   |   2 +
 sysdeps/unix/sysv/linux/microblaze/libc.abilist    |   2 +
 .../unix/sysv/linux/mips/mips32/fpu/libc.abilist   |   2 +
 .../unix/sysv/linux/mips/mips32/nofpu/libc.abilist |   2 +
 .../unix/sysv/linux/mips/mips64/n32/libc.abilist   |   2 +
 .../unix/sysv/linux/mips/mips64/n64/libc.abilist   |   1 +
 sysdeps/unix/sysv/linux/nios2/libc.abilist         |   2 +
 sysdeps/unix/sysv/linux/powerpc/kernel-features.h  |   9 ++
 .../sysv/linux/powerpc/powerpc32/fpu/libc.abilist  |   2 +
 .../linux/powerpc/powerpc32/nofpu/libc.abilist     |   2 +
 .../sysv/linux/powerpc/powerpc64/libc-le.abilist   |   3 +
 .../unix/sysv/linux/powerpc/powerpc64/libc.abilist |   1 +
 sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist    |   1 +
 sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist  |   2 +
 sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist  |   1 +
 sysdeps/unix/sysv/linux/sh/libc.abilist            |   2 +
 sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist |   2 +
 sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist |   1 +
 sysdeps/unix/sysv/linux/tst-ofdlocks.c             |  76 ++++++++++++++
 sysdeps/unix/sysv/linux/x86_64/64/libc.abilist     |   1 +
 sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist    |   1 +
 42 files changed, 422 insertions(+), 59 deletions(-)
 rename sysdeps/unix/sysv/linux/powerpc/powerpc64/fcntl.c => io/fcntl64.c (65%)
 create mode 100644 sysdeps/unix/sysv/linux/fcntl64.c
 create mode 100644 sysdeps/unix/sysv/linux/tst-ofdlocks.c

-- 
2.7.4

Patch

diff --git a/NEWS b/NEWS
index e2a6f45..c4a2020 100644
--- a/NEWS
+++ b/NEWS
@@ -98,6 +98,11 @@  Deprecated and removed features, and other changes affecting compatibility:
   restriction (rejecting '_' in host names, among other things) has been
   removed, for increased compatibility with non-IDN name resolution.
 
+* The fcntl function now have a Long File Support variant named fcntl64.  It
+  is added to fix some Linux Open File Description locks usage on non LFS
+  mode.  As for others *64 functions, fcntl64 semantics are analogous with
+  fcntl and LFS support is handled transparently.
+
 Changes to build and runtime requirements:
 
   [Add changes to build and runtime requirements here]
diff --git a/include/fcntl.h b/include/fcntl.h
index 3d68c5e..374e784 100644
--- a/include/fcntl.h
+++ b/include/fcntl.h
@@ -10,10 +10,14 @@  extern int __libc_open (const char *file, int oflag, ...);
 libc_hidden_proto (__libc_open)
 extern int __libc_fcntl (int fd, int cmd, ...) attribute_hidden;
 libc_hidden_proto (__libc_fcntl)
+extern int __libc_fcntl64 (int fd, int cmd, ...) attribute_hidden;
+libc_hidden_proto (__libc_fcntl64)
 extern int __open (const char *__file, int __oflag, ...);
 libc_hidden_proto (__open)
 extern int __fcntl (int __fd, int __cmd, ...);
 libc_hidden_proto (__fcntl)
+extern int __fcntl64 (int __fd, int __cmd, ...) attribute_hidden;
+libc_hidden_proto (__fcntl64)
 extern int __openat (int __fd, const char *__file, int __oflag, ...)
   __nonnull ((2));
 libc_hidden_proto (__openat)
diff --git a/io/Makefile b/io/Makefile
index 2117cb6..4a0d8fe 100644
--- a/io/Makefile
+++ b/io/Makefile
@@ -40,7 +40,7 @@  routines :=								\
 	mkdir mkdirat							\
 	open open_2 open64 open64_2 openat openat_2 openat64 openat64_2	\
 	read write lseek lseek64 access euidaccess faccessat		\
-	fcntl flock lockf lockf64					\
+	fcntl fcntl64 flock lockf lockf64				\
 	close dup dup2 dup3 pipe pipe2					\
 	creat creat64							\
 	chdir fchdir							\
@@ -89,6 +89,7 @@  CFLAGS-open64.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-creat.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-creat64.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-fcntl.c += -fexceptions -fasynchronous-unwind-tables
+CFLAGS-fcntl64.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-poll.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-ppoll.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-lockf.c += -fexceptions
diff --git a/io/Versions b/io/Versions
index 98898cb..7653588 100644
--- a/io/Versions
+++ b/io/Versions
@@ -128,4 +128,7 @@  libc {
   GLIBC_2.27 {
     copy_file_range;
   }
+  GLIBC_2.28 {
+    fcntl64;
+  }
 }
diff --git a/io/fcntl.h b/io/fcntl.h
index 69a4394..3afc620 100644
--- a/io/fcntl.h
+++ b/io/fcntl.h
@@ -167,7 +167,18 @@  typedef __pid_t pid_t;
 
    This function is a cancellation point and therefore not marked with
    __THROW.  */
+#ifndef __USE_FILE_OFFSET64
 extern int fcntl (int __fd, int __cmd, ...);
+#else
+# ifdef __REDIRECT
+extern int __REDIRECT (fcntl, (int __fd, int __cmd, ...), fcntl64);
+# else
+#  define fcntl fcntl64
+# endif
+#endif
+#ifdef __USE_LARGEFILE64
+extern int fcntl64 (int __fd, int __cmd, ...);
+#endif
 
 /* Open FILE and return a new file descriptor for it, or -1 on error.
    OFLAG determines the type of access used.  If O_CREAT or O_TMPFILE is set
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/fcntl.c b/io/fcntl64.c
similarity index 65%
rename from sysdeps/unix/sysv/linux/powerpc/powerpc64/fcntl.c
rename to io/fcntl64.c
index 48198c1..f4e6809 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/fcntl.c
+++ b/io/fcntl64.c
@@ -1,4 +1,5 @@ 
-/* Copyright (C) 2000-2018 Free Software Foundation, Inc.
+/* Manipulate file descriptor.  Stub LFS version.
+   Copyright (C) 2018 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -15,18 +16,23 @@ 
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <unistd.h>
+#include <errno.h>
 #include <fcntl.h>
 
-static inline int
-fcntl_adjust_cmd (int cmd)
+/* Perform file control operations on FD.  */
+int
+__fcntl64 (int fd, int cmd, ...)
 {
-  if (cmd >= F_GETLK64 && cmd <= F_SETLKW64)
-    cmd -= F_GETLK64 - F_GETLK;
-  return cmd;
-}
+  if (fd < 0)
+    {
+      __set_errno (EBADF);
+      return -1;
+    }
 
-#define FCNTL_ADJUST_CMD(__cmd) \
-  fcntl_adjust_cmd (__cmd)
+  __set_errno (ENOSYS);
+  return -1;
+}
+libc_hidden_def (__fcntl64)
+stub_warning (fcntl64)
 
-#include <sysdeps/unix/sysv/linux/fcntl.c>
+weak_alias (__fcntl64, fcntl64)
diff --git a/manual/llio.texi b/manual/llio.texi
index 82f03be..e840c55 100644
--- a/manual/llio.texi
+++ b/manual/llio.texi
@@ -3281,12 +3281,13 @@  Set process or process group ID to receive @code{SIGIO} signals.
 @xref{Interrupt Input}.
 @end vtable
 
-This function is a cancellation point in multi-threaded programs.  This
-is a problem if the thread allocates some resources (like memory, file
-descriptors, semaphores or whatever) at the time @code{fcntl} is
-called.  If the thread gets canceled these resources stay allocated
-until the program ends.  To avoid this calls to @code{fcntl} should be
-protected using cancellation handlers.
+This function is a cancellation point in multi-threaded programs for the
+commands @code{F_SETLKW} (and the LFS analogous @code{F_SETLKW64}) and
+@code {F_OFD_SETLKW}.  This is a problem if the thread allocates some
+resources (like memory, file descriptors, semaphores or whatever) at the time
+@code{fcntl} is called.  If the thread gets canceled these resources stay
+allocated until the program ends.  To avoid this calls to @code{fcntl} should
+be protected using cancellation handlers.
 @c ref pthread_cleanup_push / pthread_cleanup_pop
 @end deftypefun
 
diff --git a/nptl/Makefile b/nptl/Makefile
index 94be92c..13d485c 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -36,7 +36,7 @@  static-only-routines = pthread_atfork
 # We need to provide certain routines for compatibility with existing
 # binaries.
 pthread-compat-wrappers = \
-		      write read close fcntl accept \
+		      write read close fcntl fcntl64 accept \
 		      connect recv recvfrom send \
 		      sendto fsync lseek lseek64 \
 		      msync nanosleep open open64 pause \
@@ -191,6 +191,7 @@  CFLAGS-sem_timedwait.c += -fexceptions -fasynchronous-unwind-tables
 
 # These are the function wrappers we have to duplicate here.
 CFLAGS-fcntl.c += -fexceptions -fasynchronous-unwind-tables
+CFLAGS-fcntl64.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-lockf.c += -fexceptions
 CFLAGS-pread.c += -fexceptions -fasynchronous-unwind-tables
 CFLAGS-pread64.c += -fexceptions -fasynchronous-unwind-tables
diff --git a/sysdeps/mach/hurd/fcntl.c b/sysdeps/mach/hurd/fcntl.c
index 0b23164..598317d 100644
--- a/sysdeps/mach/hurd/fcntl.c
+++ b/sysdeps/mach/hurd/fcntl.c
@@ -210,3 +210,8 @@  libc_hidden_def (__libc_fcntl)
 weak_alias (__libc_fcntl, __fcntl)
 libc_hidden_weak (__fcntl)
 weak_alias (__libc_fcntl, fcntl)
+
+strong_alias (__libc_fcntl, __libc_fcntl64)
+libc_hidden_def (__libc_fcntl64)
+weak_alias (__libc_fcntl64, __fcntl64)
+libc_hidden_weak (__fcntl64)
diff --git a/sysdeps/mach/hurd/i386/libc.abilist b/sysdeps/mach/hurd/i386/libc.abilist
index 2cb5070..3d46de7 100644
--- a/sysdeps/mach/hurd/i386/libc.abilist
+++ b/sysdeps/mach/hurd/i386/libc.abilist
@@ -2033,6 +2033,8 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
index cd6244f..9780e75 100644
--- a/sysdeps/unix/sysv/linux/Makefile
+++ b/sysdeps/unix/sysv/linux/Makefile
@@ -45,7 +45,7 @@  sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
 tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
 	 tst-quota tst-sync_file_range tst-sysconf-iov_max tst-ttyname \
 	 test-errno-linux tst-memfd_create tst-mlock2 tst-pkey \
-	 tst-rlimit-infinity
+	 tst-rlimit-infinity tst-ofdlocks
 
 # Generate the list of SYS_* macros for the system calls (__NR_*
 # macros).  The file syscall-names.list contains all possible system
diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
index 80cdb98..884d0df 100644
--- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist
@@ -2131,3 +2131,4 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist
index c761f61..28d54b9 100644
--- a/sysdeps/unix/sysv/linux/alpha/libc.abilist
+++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist
@@ -2026,6 +2026,7 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/arm/libc.abilist b/sysdeps/unix/sysv/linux/arm/libc.abilist
index 6aa58c3..dfde3bd 100644
--- a/sysdeps/unix/sysv/linux/arm/libc.abilist
+++ b/sysdeps/unix/sysv/linux/arm/libc.abilist
@@ -115,6 +115,8 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0xa0
 GLIBC_2.4 _IO_2_1_stdin_ D 0xa0
diff --git a/sysdeps/unix/sysv/linux/fcntl.c b/sysdeps/unix/sysv/linux/fcntl.c
index a3cb2ae..17ea0ac 100644
--- a/sysdeps/unix/sysv/linux/fcntl.c
+++ b/sysdeps/unix/sysv/linux/fcntl.c
@@ -19,33 +19,12 @@ 
 #include <stdarg.h>
 #include <errno.h>
 #include <sysdep-cancel.h>
-#include <not-cancel.h>
 
-#ifndef __NR_fcntl64
-# define __NR_fcntl64 __NR_fcntl
-#endif
+#ifndef __OFF_T_MATCHES_OFF64_T
 
-#ifndef FCNTL_ADJUST_CMD
-# define FCNTL_ADJUST_CMD(__cmd) __cmd
-#endif
-
-static int
-fcntl_common (int fd, int cmd, void *arg)
-{
-  if (cmd == F_GETOWN)
-    {
-      INTERNAL_SYSCALL_DECL (err);
-      struct f_owner_ex fex;
-      int res = INTERNAL_SYSCALL_CALL (fcntl64, err, fd, F_GETOWN_EX, &fex);
-      if (!INTERNAL_SYSCALL_ERROR_P (res, err))
-	return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
-
-      return INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (res,
-								    err));
-    }
-
-  return INLINE_SYSCALL_CALL (fcntl64, fd, cmd, (void *) arg);
-}
+# ifndef FCNTL_ADJUST_CMD
+#  define FCNTL_ADJUST_CMD(__cmd) __cmd
+# endif
 
 int
 __libc_fcntl (int fd, int cmd, ...)
@@ -59,16 +38,76 @@  __libc_fcntl (int fd, int cmd, ...)
 
   cmd = FCNTL_ADJUST_CMD (cmd);
 
-  if (cmd == F_SETLKW || cmd == F_SETLKW64)
-    return SYSCALL_CANCEL (fcntl64, fd, cmd, (void *) arg);
-
-  return fcntl_common (fd, cmd, arg);
+  switch (cmd)
+    {
+      case F_SETLKW:
+      case F_SETLKW64:
+	return SYSCALL_CANCEL (fcntl64, fd, cmd, arg);
+      case F_OFD_SETLKW:
+	{
+	  struct flock *flk = (struct flock *) arg;
+	  struct flock64 flk64 =
+	  {
+	    .l_type = flk->l_type,
+	    .l_whence = flk->l_whence,
+	    .l_start = flk->l_start,
+	    .l_len = flk->l_len,
+	    .l_pid = flk->l_pid
+	  };
+	  return SYSCALL_CANCEL (fcntl64, fd, cmd, &flk64);
+	}
+      case F_OFD_GETLK:
+      case F_OFD_SETLK:
+	{
+	  struct flock *flk = (struct flock *) arg;
+	  struct flock64 flk64 =
+	  {
+	    .l_type = flk->l_type,
+	    .l_whence = flk->l_whence,
+	    .l_start = flk->l_start,
+	    .l_len = flk->l_len,
+	    .l_pid = flk->l_pid
+	  };
+	  int ret = INLINE_SYSCALL_CALL (fcntl64, fd, cmd, &flk64);
+	  if (ret == -1)
+	    return -1;
+	  if ((off_t) flk64.l_start != flk64.l_start
+	      || (off_t) flk64.l_len != flk64.l_len)
+	    {
+	      __set_errno (EOVERFLOW);
+	      return -1;
+	    }
+	  flk->l_type = flk64.l_type;
+	  flk->l_whence = flk64.l_whence;
+	  flk->l_start = flk64.l_start;
+	  flk->l_len = flk64.l_len;
+	  flk->l_pid = flk64.l_pid;
+	  return ret;
+	}
+      case F_GETOWN:
+	{
+	  INTERNAL_SYSCALL_DECL (err);
+	  struct f_owner_ex fex;
+	  int res = INTERNAL_SYSCALL_CALL (fcntl64, err, fd, F_GETOWN_EX, &fex);
+	    if (!INTERNAL_SYSCALL_ERROR_P (res, err))
+	  return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
+
+	  return INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (res,
+									    err));
+	}
+      /* case F_OFD_GETLK: case F_OFD_GETLK64: case F_SETLK64:  */
+      default:
+	return INLINE_SYSCALL_CALL (fcntl64, fd, cmd, arg);
+    }
 }
 libc_hidden_def (__libc_fcntl)
+weak_alias (__libc_fcntl, __fcntl)
+libc_hidden_weak (__fcntl)
 
-#if !IS_IN (rtld)
+# include <shlib-compat.h>
+# if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_28)
 int
-__fcntl_nocancel (int fd, int cmd, ...)
+__old_libc_fcntl64 (int fd, int cmd, ...)
 {
   va_list ap;
   void *arg;
@@ -77,13 +116,12 @@  __fcntl_nocancel (int fd, int cmd, ...)
   arg = va_arg (ap, void *);
   va_end (ap);
 
-  return fcntl_common (fd, cmd, arg);
+  return __libc_fcntl64 (fd, cmd, arg);
 }
-#else
-strong_alias (__libc_fcntl, __fcntl_nocancel)
-#endif
-libc_hidden_def (__fcntl_nocancel)
-
-weak_alias (__libc_fcntl, __fcntl)
-libc_hidden_weak (__fcntl)
+compat_symbol (libc, __old_libc_fcntl64, fcntl, GLIBC_2_0);
+versioned_symbol (libc, __libc_fcntl, fcntl, GLIBC_2_28);
+# else
 weak_alias (__libc_fcntl, fcntl)
+# endif
+
+#endif /* __OFF_T_MATCHES_OFF64_T  */
diff --git a/sysdeps/unix/sysv/linux/fcntl64.c b/sysdeps/unix/sysv/linux/fcntl64.c
new file mode 100644
index 0000000..81e88a8
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/fcntl64.c
@@ -0,0 +1,99 @@ 
+/* Manipulate file descriptor.  Linux LFS version.
+   Copyright (C) 2018 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#define fcntl __no_decl_fcntl
+#define __fcntl __no_decl___fcntl
+#include <fcntl.h>
+#undef fcntl
+#undef __fcntl
+#include <stdarg.h>
+#include <errno.h>
+#include <sysdep-cancel.h>
+
+#ifndef __NR_fcntl64
+# define __NR_fcntl64 __NR_fcntl
+#endif
+
+#ifndef FCNTL_ADJUST_CMD
+# define FCNTL_ADJUST_CMD(__cmd) __cmd
+#endif
+
+static int
+fcntl64_common (int fd, int cmd, void *arg)
+{
+  if (cmd == F_GETOWN)
+    {
+      INTERNAL_SYSCALL_DECL (err);
+      struct f_owner_ex fex;
+      int res = INTERNAL_SYSCALL_CALL (fcntl64, err, fd, F_GETOWN_EX, &fex);
+      if (!INTERNAL_SYSCALL_ERROR_P (res, err))
+	return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
+
+      return INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (res,
+								    err));
+    }
+
+  return INLINE_SYSCALL_CALL (fcntl64, fd, cmd, (void *) arg);
+}
+
+int
+__libc_fcntl64 (int fd, int cmd, ...)
+{
+  va_list ap;
+  void *arg;
+
+  va_start (ap, cmd);
+  arg = va_arg (ap, void *);
+  va_end (ap);
+
+  cmd = FCNTL_ADJUST_CMD (cmd);
+
+  if (cmd == F_SETLKW || cmd == F_SETLKW64 || cmd == F_OFD_SETLKW)
+    return SYSCALL_CANCEL (fcntl64, fd, cmd, arg);
+
+  return fcntl64_common (fd, cmd, arg);
+}
+libc_hidden_def (__libc_fcntl64)
+weak_alias (__libc_fcntl64, __fcntl64)
+libc_hidden_weak (__fcntl64)
+weak_alias (__libc_fcntl64, fcntl64)
+
+#ifdef __OFF_T_MATCHES_OFF64_T
+weak_alias (__libc_fcntl64, __libc_fcntl)
+weak_alias (__libc_fcntl64, __fcntl)
+weak_alias (__libc_fcntl64, __GI___fcntl)
+weak_alias (__libc_fcntl64, fcntl)
+#endif
+
+#if !IS_IN (rtld)
+int
+__fcntl_nocancel (int fd, int cmd, ...)
+{
+  va_list ap;
+  void *arg;
+
+  va_start (ap, cmd);
+  arg = va_arg (ap, void *);
+  va_end (ap);
+
+  return fcntl64_common (fd, cmd, arg);
+}
+#else
+weak_alias (__libc_fcntl64, __fcntl_nocancel)
+#endif
+weak_alias (__fcntl_nocancel, __GI___fcntl_nocancel)
diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist
index d10695b..06b00f7 100644
--- a/sysdeps/unix/sysv/linux/hppa/libc.abilist
+++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist
@@ -1872,6 +1872,8 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist
index 23092ab..1c1cc00 100644
--- a/sysdeps/unix/sysv/linux/i386/libc.abilist
+++ b/sysdeps/unix/sysv/linux/i386/libc.abilist
@@ -2037,6 +2037,8 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/ia64/libc.abilist b/sysdeps/unix/sysv/linux/ia64/libc.abilist
index 7bf259e..f6e17a0 100644
--- a/sysdeps/unix/sysv/linux/ia64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/ia64/libc.abilist
@@ -1907,6 +1907,7 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
index 4673bcd..ee054a6 100644
--- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist
@@ -116,6 +116,8 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.4 _Exit F
 GLIBC_2.4 _IO_2_1_stderr_ D 0x98
 GLIBC_2.4 _IO_2_1_stdin_ D 0x98
diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
index 1f8ac40..227a058 100644
--- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
+++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist
@@ -1981,6 +1981,8 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/microblaze/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
index 09277f5..18781b3 100644
--- a/sysdeps/unix/sysv/linux/microblaze/libc.abilist
+++ b/sysdeps/unix/sysv/linux/microblaze/libc.abilist
@@ -2122,3 +2122,5 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
index f562e20..2d86989 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist
@@ -1959,6 +1959,8 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
index ceb7388..b8b113e 100644
--- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist
@@ -1957,6 +1957,8 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
index 5765f48..6a3cd13 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist
@@ -1965,6 +1965,8 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
index a84bb45..596ec05 100644
--- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist
@@ -1961,6 +1961,7 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist
index e432959..8da18ee 100644
--- a/sysdeps/unix/sysv/linux/nios2/libc.abilist
+++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist
@@ -2163,3 +2163,5 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
diff --git a/sysdeps/unix/sysv/linux/powerpc/kernel-features.h b/sysdeps/unix/sysv/linux/powerpc/kernel-features.h
index 503f562..dd8a7ea 100644
--- a/sysdeps/unix/sysv/linux/powerpc/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/powerpc/kernel-features.h
@@ -52,3 +52,12 @@ 
 
 #undef __ASSUME_CLONE_DEFAULT
 #define __ASSUME_CLONE_BACKWARDS	1
+
+#ifdef __powerpc64__
+# define FCNTL_ADJUST_CMD(__cmd)				\
+  ({ int __cmdadj = (__cmd);					\
+     if (__cmdadj >= F_GETLK64 && __cmdadj <= F_SETLKW64)	\
+      __cmdadj -= F_GETLK64 - F_GETLK;				\
+     __cmdadj;							\
+  })
+#endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
index a5f2b23..555751e 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist
@@ -1985,6 +1985,8 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
index e4cbe36..80324e4 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist
@@ -1989,6 +1989,8 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
index 9869feb..079bbb4 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc-le.abilist
@@ -2221,3 +2221,6 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 GLIBC_2.28 A
+GLIBC_2.28 __fcntl64 F
+GLIBC_2.28 fcntl64 F
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
index e526dc4..15be314 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libc.abilist
@@ -116,6 +116,7 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 _Exit F
 GLIBC_2.3 _IO_2_1_stderr_ D 0xe0
 GLIBC_2.3 _IO_2_1_stdin_ D 0xe0
diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
index e6319ee..436b992 100644
--- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist
@@ -2093,3 +2093,4 @@  GLIBC_2.27 xdrstdio_create F
 GLIBC_2.27 xencrypt F
 GLIBC_2.27 xprt_register F
 GLIBC_2.27 xprt_unregister F
+GLIBC_2.28 fcntl64 F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
index 41cdda0..f66715f 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist
@@ -1994,6 +1994,8 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
index 8a756cf..bd62428 100644
--- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist
@@ -1900,6 +1900,7 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/sh/libc.abilist b/sysdeps/unix/sysv/linux/sh/libc.abilist
index 999bddd..f2f070f 100644
--- a/sysdeps/unix/sysv/linux/sh/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sh/libc.abilist
@@ -1876,6 +1876,8 @@  GLIBC_2.27 wcstof32x F
 GLIBC_2.27 wcstof32x_l F
 GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
index 7c4296f..265087f 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist
@@ -1988,6 +1988,8 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
index dafe9d7..16a6981 100644
--- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist
@@ -1930,6 +1930,7 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/tst-ofdlocks.c b/sysdeps/unix/sysv/linux/tst-ofdlocks.c
new file mode 100644
index 0000000..3ddd93d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/tst-ofdlocks.c
@@ -0,0 +1,76 @@ 
+/* Check non representable region in non-LFS mode (BZ #20251)
+   Copyright (C) 2018 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License
+   as published by the Free Software Foundation; either version 2
+   of the License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <errno.h>
+
+#include <support/temp_file.h>
+#include <support/check.h>
+
+static char *temp_filename;
+static int temp_fd;
+
+static void
+do_prepare (int argc, char **argv)
+{
+  temp_fd = create_temp_file ("tst-ofdlocks.", &temp_filename);
+  TEST_VERIFY_EXIT (temp_fd != -1);
+}
+
+#define PREPARE do_prepare
+
+static int
+do_test (void)
+{
+  /* It first allocates a open file description lock range which can not
+     be represented in a 32 bit struct flock.   */
+  struct flock64 lck64 = {
+    .l_type   = F_WRLCK,
+    .l_whence = SEEK_SET,
+    .l_start  = (off64_t)INT32_MAX + 1024,
+    .l_len    = 1024,
+  };
+  TEST_VERIFY_EXIT (fcntl64 (temp_fd, F_OFD_SETLKW, &lck64) == 0);
+
+  /* Open file description locks placed through the same open file description
+     (either by same file descriptor or a duplicated one created by fork,
+     dup, fcntl F_DUPFD, etc.) overwrites then old lock.  To force a
+     conflicting lock combinatioin, it creates a new file descriptor.  */
+  int fd = open64 (temp_filename, O_RDWR, 0666);
+  TEST_VERIFY_EXIT (fd != -1);
+
+  /* It tries then to allocate another open file descriptior with a valid
+     non-LFS bits struct flock but which will result in a conflicted region
+     which can not be represented in a non-LFS struct flock.  */
+  struct flock lck = {
+    .l_type   = F_WRLCK,
+    .l_whence = SEEK_SET,
+    .l_start  = INT32_MAX - 1024,
+    .l_len    = 4 * 1024,
+  };
+  int r = fcntl (fd, F_OFD_GETLK, &lck);
+  if (sizeof (off_t) != sizeof (off64_t))
+    TEST_VERIFY (r == -1 && errno == EOVERFLOW);
+  else
+    TEST_VERIFY (r == 0);
+
+  return 0;
+}
+
+#include <support/test-driver.c>
diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
index f72d494..fa8c198 100644
--- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist
@@ -1888,6 +1888,7 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F
 GLIBC_2.3 __ctype_b_loc F
 GLIBC_2.3 __ctype_tolower_loc F
 GLIBC_2.3 __ctype_toupper_loc F
diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
index 96c9fa0..2536971 100644
--- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
+++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist
@@ -2139,3 +2139,4 @@  GLIBC_2.27 wcstof64 F
 GLIBC_2.27 wcstof64_l F
 GLIBC_2.27 wcstof64x F
 GLIBC_2.27 wcstof64x_l F
+GLIBC_2.28 fcntl64 F