[patch 12/33] Fix compat sys_ipc() on sparc64

[Greg KH]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: David Miller <davem@xxxxxxxxxxxxx>

The 32-bit syscall trampoline for sys_ipc() on sparc64
was sign extending various arguments, which is bogus when
using compat_sys_ipc() since that function expects zero
extended copies of all the arguments.

This bug breaks the sparc64 kernel when built with gcc-4.2.x
among other things.

[SPARC64]: Fix arg passing to compat_sys_ipc().

Do not sign extend args using the sys32_ipc stub, that is
buggy and unnecessary.

Based upon an excellent report by Mikael Pettersson.

Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 arch/sparc64/kernel/sys32.S   |    1 -
 arch/sparc64/kernel/systbls.S |    2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

--- a/arch/sparc64/kernel/sys32.S
+++ b/arch/sparc64/kernel/sys32.S
@@ -91,7 +91,6 @@ SIGN1(sys32_select, compat_sys_select, %
 SIGN1(sys32_mkdir, sys_mkdir, %o1)
 SIGN3(sys32_futex, compat_sys_futex, %o1, %o2, %o5)
 SIGN1(sys32_sysfs, compat_sys_sysfs, %o0)
-SIGN3(sys32_ipc, compat_sys_ipc, %o1, %o2, %o3)
 SIGN2(sys32_sendfile, compat_sys_sendfile, %o0, %o1)
 SIGN2(sys32_sendfile64, compat_sys_sendfile64, %o0, %o1)
 SIGN1(sys32_prctl, sys_prctl, %o0)
--- a/arch/sparc64/kernel/systbls.S
+++ b/arch/sparc64/kernel/systbls.S
@@ -62,7 +62,7 @@ sys_call_table32:
 /*200*/	.word sys32_ssetmask, sys_sigsuspend, compat_sys_newlstat, sys_uselib, compat_sys_old_readdir
 	.word sys32_readahead, sys32_socketcall, sys32_syslog, sys32_lookup_dcookie, sys32_fadvise64
 /*210*/	.word sys32_fadvise64_64, sys32_tgkill, sys32_waitpid, sys_swapoff, sys32_sysinfo
-	.word sys32_ipc, sys32_sigreturn, sys_clone, sys32_ioprio_get, compat_sys_adjtimex
+	.word compat_sys_ipc, sys32_sigreturn, sys_clone, sys32_ioprio_get, compat_sys_adjtimex
 /*220*/	.word sys32_sigprocmask, sys_ni_syscall, sys32_delete_module, sys_ni_syscall, sys32_getpgid
 	.word sys32_bdflush, sys32_sysfs, sys_nis_syscall, sys32_setfsuid16, sys32_setfsgid16
 /*230*/	.word sys32_select, compat_sys_time, sys32_splice, compat_sys_stime, compat_sys_statfs64

-- 
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