Merge branch 'stable' of git://git.kernel.org/pub/scm/linux/kernel/gi…

…t/cmetcalf/linux-tile

Pull tile architecture fixes from Chris Metcalf:
 "This fixes the bug that Al Viro spotted with the compat llseek code.
  I also fixed the compat syscall definitions to use the new syscall
  define macros to properly sign-extend their arguments."

* 'stable' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
  tile: properly use COMPAT_SYSCALL_DEFINEx
  tile: work around bug in the generic sys_llseek

arch/tile/include/asm/compat.h

@@ -288,6 +288,9 @@ long compat_sys_sync_file_range2(int fd, unsigned int flags,
 long compat_sys_fallocate(int fd, int mode,
 			  u32 offset_lo, u32 offset_hi,
 			  u32 len_lo, u32 len_hi);
+long compat_sys_llseek(unsigned int fd, unsigned int offset_high,
+		       unsigned int offset_low, loff_t __user * result,
+		       unsigned int origin);
 
 /* Assembly trampoline to avoid clobbering r0. */
 long _compat_sys_rt_sigreturn(void);

arch/tile/kernel/compat.c

@@ -32,57 +32,73 @@
  * adapt the usual convention.
  */
 
-long compat_sys_truncate64(char __user *filename, u32 dummy, u32 low, u32 high)
+COMPAT_SYSCALL_DEFINE4(truncate64, char __user *, filename, u32, dummy,
+                       u32, low, u32, high)
 {
 	return sys_truncate(filename, ((loff_t)high << 32) | low);
 }
 
-long compat_sys_ftruncate64(unsigned int fd, u32 dummy, u32 low, u32 high)
+COMPAT_SYSCALL_DEFINE4(ftruncate64, unsigned int, fd, u32, dummy,
+                       u32, low, u32, high)
 {
 	return sys_ftruncate(fd, ((loff_t)high << 32) | low);
 }
 
-long compat_sys_pread64(unsigned int fd, char __user *ubuf, size_t count,
-			u32 dummy, u32 low, u32 high)
+COMPAT_SYSCALL_DEFINE6(pread64, unsigned int, fd, char __user *, ubuf,
+                       size_t, count, u32, dummy, u32, low, u32, high)
 {
 	return sys_pread64(fd, ubuf, count, ((loff_t)high << 32) | low);
 }
 
-long compat_sys_pwrite64(unsigned int fd, char __user *ubuf, size_t count,
-			 u32 dummy, u32 low, u32 high)
+COMPAT_SYSCALL_DEFINE6(pwrite64, unsigned int, fd, char __user *, ubuf,
+                       size_t, count, u32, dummy, u32, low, u32, high)
 {
 	return sys_pwrite64(fd, ubuf, count, ((loff_t)high << 32) | low);
 }
 
-long compat_sys_lookup_dcookie(u32 low, u32 high, char __user *buf, size_t len)
+COMPAT_SYSCALL_DEFINE4(lookup_dcookie, u32, low, u32, high,
+                       char __user *, buf, size_t, len)
 {
 	return sys_lookup_dcookie(((loff_t)high << 32) | low, buf, len);
 }
 
-long compat_sys_sync_file_range2(int fd, unsigned int flags,
-				 u32 offset_lo, u32 offset_hi,
-				 u32 nbytes_lo, u32 nbytes_hi)
+COMPAT_SYSCALL_DEFINE6(sync_file_range2, int, fd, unsigned int, flags,
+                       u32, offset_lo, u32, offset_hi,
+                       u32, nbytes_lo, u32, nbytes_hi)
 {
 	return sys_sync_file_range(fd, ((loff_t)offset_hi << 32) | offset_lo,
 				   ((loff_t)nbytes_hi << 32) | nbytes_lo,
 				   flags);
 }
 
-long compat_sys_fallocate(int fd, int mode,
-			  u32 offset_lo, u32 offset_hi,
-			  u32 len_lo, u32 len_hi)
+COMPAT_SYSCALL_DEFINE6(fallocate, int, fd, int, mode,
+                       u32, offset_lo, u32, offset_hi,
+                       u32, len_lo, u32, len_hi)
 {
 	return sys_fallocate(fd, mode, ((loff_t)offset_hi << 32) | offset_lo,
 			     ((loff_t)len_hi << 32) | len_lo);
 }
 
+/*
+ * Avoid bug in generic sys_llseek() that specifies offset_high and
+ * offset_low as "unsigned long", thus making it possible to pass
+ * a sign-extended high 32 bits in offset_low.
+ */
+COMPAT_SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned int, offset_high,
+		       unsigned int, offset_low, loff_t __user *, result,
+		       unsigned int, origin)
+{
+	return sys_llseek(fd, offset_high, offset_low, result, origin);
+}
+
 /* Provide the compat syscall number to call mapping. */
 #undef __SYSCALL
 #define __SYSCALL(nr, call) [nr] = (call),
 
 /* See comments in sys.c */
 #define compat_sys_fadvise64_64 sys32_fadvise64_64
 #define compat_sys_readahead sys32_readahead
+#define sys_llseek compat_sys_llseek
 
 /* Call the assembly trampolines where necessary. */
 #define compat_sys_rt_sigreturn _compat_sys_rt_sigreturn