x86_64: Fix readahead/sync_file_range/fadvise64 compat calls

Correctly convert the u64 arguments from 32bit to 64bit.

Pointed out by Heiko Carstens.

I guess this proves Linus' theory that nobody uses the more exotic Linux
specific syscalls.  It wasn't discovered by a user.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 22 insertions, 3 deletions

diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S
index 21868f9bed7c..47565c3345d2 100644
--- a/arch/x86_64/ia32/ia32entry.S
+++ b/arch/x86_64/ia32/ia32entry.S
@@ -620,7 +620,7 @@ ia32_sys_call_table:
         .quad quiet_ni_syscall          /* tux */
         .quad quiet_ni_syscall          /* security */
         .quad sys_gettid        
-        .quad sys_readahead     /* 225 */
+        .quad sys32_readahead   /* 225 */
         .quad sys_setxattr
         .quad sys_lsetxattr
         .quad sys_fsetxattr
@@ -645,7 +645,7 @@ ia32_sys_call_table:
         .quad compat_sys_io_getevents
         .quad compat_sys_io_submit
         .quad sys_io_cancel
-        .quad sys_fadvise64             /* 250 */
+        .quad sys32_fadvise64           /* 250 */
         .quad quiet_ni_syscall  /* free_huge_pages */
         .quad sys_exit_group
         .quad sys32_lookup_dcookie
@@ -709,7 +709,7 @@ ia32_sys_call_table:
         .quad compat_sys_set_robust_list
         .quad compat_sys_get_robust_list
         .quad sys_splice
-        .quad sys_sync_file_range
+        .quad sys32_sync_file_range
         .quad sys_tee                   /* 315 */
         .quad compat_sys_vmsplice
         .quad compat_sys_move_pages
diff --git a/arch/x86_64/ia32/sys_ia32.c b/arch/x86_64/ia32/sys_ia32.c
index 200fdde18d96..99a78a3cce7c 100644
--- a/arch/x86_64/ia32/sys_ia32.c
+++ b/arch/x86_64/ia32/sys_ia32.c
@@ -860,3 +860,22 @@ long sys32_lookup_dcookie(u32 addr_low, u32 addr_high,
         return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
 }
 
+asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi, size_t count)
+{
+        return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
+}
+
+asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
+                           unsigned n_low, unsigned n_hi,  int flags)
+{
+        return sys_sync_file_range(fd,
+                                   ((u64)off_hi << 32) | off_low,
+                                   ((u64)n_hi << 32) | n_low, flags);
+}
+
+asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi, size_t len,
+                     int advice)
+{
+        return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
+                                len, advice);
+}