[S390] Add missing compat system call wrappers.

Add wrapper functions for the following compat system calls:
* readahead
* sendfile64
* tkill
* tgkill
* keyctl
This ensures that the high order bits of the parameter registers are correctly
sign extended.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

2 files changed, 43 insertions, 5 deletions

diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index 6035cd20c7a7..62c706eb0de6 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -1767,3 +1767,41 @@ sys_dup3_wrapper:
 sys_epoll_create1_wrapper:
         lgfr    %r2,%r2                 # int
         jg      sys_epoll_create1       # branch to system call
+
+        .globl  sys32_readahead_wrapper
+sys32_readahead_wrapper:
+        lgfr    %r2,%r2                 # int
+        llgfr   %r3,%r3                 # u32
+        llgfr   %r4,%r4                 # u32
+        lgfr    %r5,%r5                 # s32
+        jg      sys32_readahead         # branch to system call
+
+        .globl  sys32_sendfile64_wrapper
+sys32_sendfile64_wrapper:
+        lgfr    %r2,%r2                 # int
+        lgfr    %r3,%r3                 # int
+        llgtr   %r4,%r4                 # compat_loff_t *
+        lgfr    %r5,%r5                 # s32
+        jg      sys32_sendfile64        # branch to system call
+
+        .globl  sys_tkill_wrapper
+sys_tkill_wrapper:
+        lgfr    %r2,%r2                 # pid_t
+        lgfr    %r3,%r3                 # int
+        jg      sys_tkill               # branch to system call
+
+        .globl  sys_tgkill_wrapper
+sys_tgkill_wrapper:
+        lgfr    %r2,%r2                 # pid_t
+        lgfr    %r3,%r3                 # pid_t
+        lgfr    %r4,%r4                 # int
+        jg      sys_tgkill              # branch to system call
+
+        .globl  compat_sys_keyctl_wrapper
+compat_sys_keyctl_wrapper:
+        llgfr   %r2,%r2                 # u32
+        llgfr   %r3,%r3                 # u32
+        llgfr   %r4,%r4                 # u32
+        llgfr   %r5,%r5                 # u32
+        llgfr   %r6,%r6                 # u32
+        jg      compat_sys_keyctl       # branch to system call
diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S
index 3e18d8a5e614..fe5b25a988ab 100644
--- a/arch/s390/kernel/syscalls.S
+++ b/arch/s390/kernel/syscalls.S
@@ -230,8 +230,8 @@ SYSCALL(sys_mincore,sys_mincore,sys32_mincore_wrapper)
 SYSCALL(sys_madvise,sys_madvise,sys32_madvise_wrapper)
 SYSCALL(sys_getdents64,sys_getdents64,sys32_getdents64_wrapper) /* 220 */
 SYSCALL(sys_fcntl64,sys_ni_syscall,compat_sys_fcntl64_wrapper)
-SYSCALL(sys_readahead,sys_readahead,sys32_readahead)
-SYSCALL(sys_sendfile64,sys_ni_syscall,sys32_sendfile64)
+SYSCALL(sys_readahead,sys_readahead,sys32_readahead_wrapper)
+SYSCALL(sys_sendfile64,sys_ni_syscall,sys32_sendfile64_wrapper)
 SYSCALL(sys_setxattr,sys_setxattr,sys32_setxattr_wrapper)
 SYSCALL(sys_lsetxattr,sys_lsetxattr,sys32_lsetxattr_wrapper)    /* 225 */
 SYSCALL(sys_fsetxattr,sys_fsetxattr,sys32_fsetxattr_wrapper)
@@ -245,11 +245,11 @@ SYSCALL(sys_removexattr,sys_removexattr,sys32_removexattr_wrapper)
 SYSCALL(sys_lremovexattr,sys_lremovexattr,sys32_lremovexattr_wrapper)
 SYSCALL(sys_fremovexattr,sys_fremovexattr,sys32_fremovexattr_wrapper)   /* 235 */
 SYSCALL(sys_gettid,sys_gettid,sys_gettid)
-SYSCALL(sys_tkill,sys_tkill,sys_tkill)
+SYSCALL(sys_tkill,sys_tkill,sys_tkill_wrapper)
 SYSCALL(sys_futex,sys_futex,compat_sys_futex_wrapper)
 SYSCALL(sys_sched_setaffinity,sys_sched_setaffinity,sys32_sched_setaffinity_wrapper)
 SYSCALL(sys_sched_getaffinity,sys_sched_getaffinity,sys32_sched_getaffinity_wrapper)    /* 240 */
-SYSCALL(sys_tgkill,sys_tgkill,sys_tgkill)
+SYSCALL(sys_tgkill,sys_tgkill,sys_tgkill_wrapper)
 NI_SYSCALL                                                      /* reserved for TUX */
 SYSCALL(sys_io_setup,sys_io_setup,sys32_io_setup_wrapper)
 SYSCALL(sys_io_destroy,sys_io_destroy,sys32_io_destroy_wrapper)
@@ -288,7 +288,7 @@ SYSCALL(sys_mq_getsetattr,sys_mq_getsetattr,compat_sys_mq_getsetattr_wrapper)
 SYSCALL(sys_kexec_load,sys_kexec_load,compat_sys_kexec_load_wrapper)
 SYSCALL(sys_add_key,sys_add_key,compat_sys_add_key_wrapper)
 SYSCALL(sys_request_key,sys_request_key,compat_sys_request_key_wrapper)
-SYSCALL(sys_keyctl,sys_keyctl,compat_sys_keyctl)                /* 280 */
+SYSCALL(sys_keyctl,sys_keyctl,compat_sys_keyctl_wrapper)                /* 280 */
 SYSCALL(sys_waitid,sys_waitid,compat_sys_waitid_wrapper)
 SYSCALL(sys_ioprio_set,sys_ioprio_set,sys_ioprio_set_wrapper)
 SYSCALL(sys_ioprio_get,sys_ioprio_get,sys_ioprio_get_wrapper)