Fix linux personality syscall wrapper

The personality system call, starting with linux kernel commit
v2.6.29-6609-g11d06b2a1e5658f448a308aa3beb97bacd64a940, always
successfully changes the personality if requested.  The syscall
wrapper, however, still can return an error in the following cases:
- the value returned by the system call looks like an error
due to architecture limitations of 32-bit kernels;
- a personality greater than 0xffffffff is passed to the system call,
and the 64-bit kernel does not have commit
v2.6.35-rc1-372-g485d527686850d68a0e9006dd9904f19f122485e
that would truncate this value to unsigned int;
- on sparc64, the value returned by the system call looks like an error
due to sparc64 kernel sign extension bug.

The solution is three-fold:
- move generic syscalls.list personality entry to generic 64-bit
syscalls.list file;
- for each 32-bit architecture that use negated errno semantics,
add a NOERRNO personality entry to their syscalls.list file;
- for sparc64 and 32-bit architectures that use dedicated registers
to flag syscall errors, add a wrapper around personality syscall;
if the system call return value is flagged as an error, this wrapper
returns the negated "would be errno" value, otherwise it returns
the system call return value; on sparc64, it also truncates the
personality argument to unsigned int before passing it to the kernel.

[BZ #19408]
* sysdeps/unix/sysv/linux/personality.c: New file.
* sysdeps/unix/sysv/linux/sparc/sparc64/personality.c: Likewise.
* sysdeps/unix/sysv/linux/tst-personality.c: Likewise.
* sysdeps/unix/sysv/linux/Makefile [$(subdir) == misc]
(sysdep_routines): Add personality.
(tests): Add tst-personality.
* sysdeps/unix/sysv/linux/syscalls.list (personality): Move ...
* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: ... here.
* sysdeps/unix/sysv/linux/arm/syscalls.list (personality): New entry.
* sysdeps/unix/sysv/linux/hppa/syscalls.list (personality): Likewise.
* sysdeps/unix/sysv/linux/i386/syscalls.list (personality): Likewise.
* sysdeps/unix/sysv/linux/m68k/syscalls.list (personality): Likewise.
* sysdeps/unix/sysv/linux/microblaze/syscalls.list (personality):
Likewise.
* sysdeps/unix/sysv/linux/mips/mips64/n32/syscalls.list (personality):
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/syscalls.list (personality):
Likewise.
* sysdeps/unix/sysv/linux/sh/syscalls.list (personality): Likewise.
* sysdeps/unix/sysv/linux/x86_64/x32/syscalls.list (personality):
Likewise.

1 files changed, 25 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 85d39d6107..51a055c825 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,28 @@
+2015-12-30  Dmitry V. Levin  <ldv@altlinux.org>
+
+	[BZ #19408]
+	* sysdeps/unix/sysv/linux/personality.c: New file.
+	* sysdeps/unix/sysv/linux/sparc/sparc64/personality.c: Likewise.
+	* sysdeps/unix/sysv/linux/tst-personality.c: Likewise.
+	* sysdeps/unix/sysv/linux/Makefile [$(subdir) == misc]
+	(sysdep_routines): Add personality.
+	(tests): Add tst-personality.
+	* sysdeps/unix/sysv/linux/syscalls.list (personality): Move ...
+	* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: ... here.
+	* sysdeps/unix/sysv/linux/arm/syscalls.list (personality): New entry.
+	* sysdeps/unix/sysv/linux/hppa/syscalls.list (personality): Likewise.
+	* sysdeps/unix/sysv/linux/i386/syscalls.list (personality): Likewise.
+	* sysdeps/unix/sysv/linux/m68k/syscalls.list (personality): Likewise.
+	* sysdeps/unix/sysv/linux/microblaze/syscalls.list (personality):
+	Likewise.
+	* sysdeps/unix/sysv/linux/mips/mips64/n32/syscalls.list (personality):
+	Likewise.
+	* sysdeps/unix/sysv/linux/s390/s390-32/syscalls.list (personality):
+	Likewise.
+	* sysdeps/unix/sysv/linux/sh/syscalls.list (personality): Likewise.
+	* sysdeps/unix/sysv/linux/x86_64/x32/syscalls.list (personality):
+	Likewise.
+
 2015-12-30  Aurelien Jarno  <aurelien@aurel32.net>
 
 	* sysdeps/unix/sysv/linux/arm/ioperm.c: Do not include <string.h>.