KEYS: Use the compat keyctl() syscall wrapper on Sparc64 for Sparc32 compat

commit 45de6767dc51358a188f75dc4ad9dfddb7fb9480 upstream.

Use the 32-bit compat keyctl() syscall wrapper on Sparc64 for Sparc32 binary
compatibility.

Without this, keyctl(KEYCTL_INSTANTIATE_IOV) is liable to malfunction as it
uses an iovec array read from userspace - though the kernel should survive this
as it checks pointers and sizes anyway.

I think all the other keyctl() function should just work, provided (a) the top
32-bits of each 64-bit argument register are cleared prior to invoking the
syscall routine, and the 32-bit address space is right at the 0-end of the
64-bit address space.  Most of the arguments are 32-bit anyway, and so for
those clearing is not required.

Signed-off-by: David Howells <dhowells@redhat.com
cc: "David S. Miller" <davem@davemloft.net>
cc: sparclinux@vger.kernel.org
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index f92602e..f210d51 100644 (file)
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -583,6 +583,9 @@ config SYSVIPC_COMPAT
        depends on COMPAT && SYSVIPC
        default y
 
+config KEYS_COMPAT
+       def_bool y if COMPAT && KEYS
+
 endmenu
 
 source "net/Kconfig"

diff --git a/arch/sparc/kernel/systbls_64.S b/arch/sparc/kernel/systbls_64.S
index db86b1a..3a58e0d 100644 (file)
--- a/arch/sparc/kernel/systbls_64.S
+++ b/arch/sparc/kernel/systbls_64.S
@@ -74,7 +74,7 @@ sys_call_table32:
        .word sys_timer_delete, compat_sys_timer_create, sys_ni_syscall, compat_sys_io_setup, sys_io_destroy
 /*270*/        .word sys32_io_submit, sys_io_cancel, compat_sys_io_getevents, sys32_mq_open, sys_mq_unlink
        .word compat_sys_mq_timedsend, compat_sys_mq_timedreceive, compat_sys_mq_notify, compat_sys_mq_getsetattr, compat_sys_waitid
-/*280*/        .word sys32_tee, sys_add_key, sys_request_key, sys_keyctl, compat_sys_openat
+/*280*/        .word sys32_tee, sys_add_key, sys_request_key, compat_sys_keyctl, compat_sys_openat
        .word sys_mkdirat, sys_mknodat, sys_fchownat, compat_sys_futimesat, compat_sys_fstatat64
 /*290*/        .word sys_unlinkat, sys_renameat, sys_linkat, sys_symlinkat, sys_readlinkat
        .word sys_fchmodat, sys_faccessat, compat_sys_pselect6, compat_sys_ppoll, sys_unshare