fix compat truncate/ftruncate

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/arm64/include/asm/unistd32.h

@@ -113,8 +113,8 @@ __SYSCALL(88,  sys_reboot)
 __SYSCALL(89,  sys_ni_syscall)			/* 89 was sys_readdir */
 __SYSCALL(90,  sys_ni_syscall)			/* 90 was sys_mmap */
 __SYSCALL(91,  sys_munmap)
-__SYSCALL(92,  sys_truncate)
-__SYSCALL(93,  sys_ftruncate)
+__SYSCALL(92,  compat_sys_truncate)
+__SYSCALL(93,  compat_sys_ftruncate)
 __SYSCALL(94,  sys_fchmod)
 __SYSCALL(95,  sys_fchown16)
 __SYSCALL(96,  sys_getpriority)

arch/mips/kernel/scall64-o32.S

@@ -284,8 +284,8 @@ sys_call_table:
 	PTR	compat_sys_old_readdir
 	PTR	sys_mips_mmap			/* 4090 */
 	PTR	sys_munmap
-	PTR	sys_truncate
-	PTR	sys_ftruncate
+	PTR	compat_sys_truncate
+	PTR	compat_sys_ftruncate
 	PTR	sys_fchmod
 	PTR	sys_fchown			/* 4095 */
 	PTR	sys_getpriority

arch/parisc/kernel/syscall_table.S

@@ -165,8 +165,8 @@
 	ENTRY_SAME(mmap2)
 	ENTRY_SAME(mmap)		/* 90 */
 	ENTRY_SAME(munmap)
-	ENTRY_SAME(truncate)
-	ENTRY_SAME(ftruncate)
+	ENTRY_COMP(truncate)
+	ENTRY_COMP(ftruncate)
 	ENTRY_SAME(fchmod)
 	ENTRY_SAME(fchown)		/* 95 */
 	ENTRY_SAME(getpriority)

arch/powerpc/kernel/sys_ppc32.c

@@ -146,18 +146,6 @@ asmlinkage long compat_sys_sendfile64_wrapper(u32 out_fd, u32 in_fd,
 			    (off_t __user *)offset, count);
 }
 
-long compat_sys_truncate(const char __user * path, u32 length)
-{
-	/* sign extend length */
-	return sys_truncate(path, (int)length);
-}
-
-long compat_sys_ftruncate(int fd, u32 length)
-{
-	/* sign extend length */
-	return sys_ftruncate(fd, (int)length);
-}
-
 unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
 			  unsigned long prot, unsigned long flags,
 			  unsigned long fd, unsigned long pgoff)

arch/s390/kernel/compat_wrapper.S

@@ -325,16 +325,6 @@ ENTRY(sys32_munmap_wrapper)
 	llgfr	%r3,%r3			# size_t
 	jg	sys_munmap		# branch to system call
 
-ENTRY(sys32_truncate_wrapper)
-	llgtr	%r2,%r2			# const char *
-	lgfr	%r3,%r3			# long
-	jg	sys_truncate		# branch to system call
-
-ENTRY(sys32_ftruncate_wrapper)
-	llgfr	%r2,%r2			# unsigned int
-	llgfr	%r3,%r3			# unsigned long
-	jg	sys_ftruncate		# branch to system call
-
 ENTRY(sys32_fchmod_wrapper)
 	llgfr	%r2,%r2			# unsigned int
 	llgfr	%r3,%r3			# mode_t

arch/s390/kernel/syscalls.S

@@ -100,8 +100,8 @@ SYSCALL(sys_reboot,sys_reboot,sys32_reboot_wrapper)
 SYSCALL(sys_ni_syscall,sys_ni_syscall,old32_readdir_wrapper)	/* old readdir syscall */
 SYSCALL(sys_old_mmap,sys_old_mmap,old32_mmap_wrapper)		/* 90 */
 SYSCALL(sys_munmap,sys_munmap,sys32_munmap_wrapper)
-SYSCALL(sys_truncate,sys_truncate,sys32_truncate_wrapper)
-SYSCALL(sys_ftruncate,sys_ftruncate,sys32_ftruncate_wrapper)
+SYSCALL(sys_truncate,sys_truncate,compat_sys_truncate)
+SYSCALL(sys_ftruncate,sys_ftruncate,compat_sys_ftruncate)
 SYSCALL(sys_fchmod,sys_fchmod,sys32_fchmod_wrapper)
 SYSCALL(sys_fchown16,sys_ni_syscall,sys32_fchown16_wrapper)	/* 95 old fchown16 syscall*/
 SYSCALL(sys_getpriority,sys_getpriority,sys32_getpriority_wrapper)

arch/sparc/kernel/sys32.S

@@ -52,7 +52,6 @@ SIGN1(sys32_recvmsg, compat_sys_recvmsg, %o0)
 SIGN1(sys32_sendmsg, compat_sys_sendmsg, %o0)
 SIGN2(sys32_sync_file_range, compat_sync_file_range, %o0, %o5)
 SIGN1(sys32_vmsplice, compat_sys_vmsplice, %o0)
-SIGN1(sys32_truncate, sys_truncate, %o1)
 
 	.globl		sys32_mmap2
 sys32_mmap2:

arch/sparc/kernel/systbls_64.S

@@ -43,8 +43,8 @@ sys_call_table32:
 /*110*/	.word sys_setresgid, sys_getresgid, sys_setregid, sys_nis_syscall, sys_nis_syscall
 	.word sys_getgroups, compat_sys_gettimeofday, sys32_getrusage, sys_nis_syscall, sys_getcwd
 /*120*/	.word compat_sys_readv, compat_sys_writev, compat_sys_settimeofday, sys_fchown16, sys_fchmod
-	.word sys_nis_syscall, sys_setreuid16, sys_setregid16, sys_rename, sys32_truncate
-/*130*/	.word sys_ftruncate, sys_flock, compat_sys_lstat64, sys_nis_syscall, sys_nis_syscall
+	.word sys_nis_syscall, sys_setreuid16, sys_setregid16, sys_rename, compat_sys_truncate
+/*130*/	.word compat_sys_ftruncate, sys_flock, compat_sys_lstat64, sys_nis_syscall, sys_nis_syscall
 	.word sys_nis_syscall, sys_mkdir, sys_rmdir, compat_sys_utimes, compat_sys_stat64
 /*140*/	.word sys_sendfile64, sys_nis_syscall, sys32_futex, sys_gettid, compat_sys_getrlimit
 	.word compat_sys_setrlimit, sys_pivot_root, sys_prctl, sys_pciconfig_read, sys_pciconfig_write

arch/x86/syscalls/syscall_32.tbl

@@ -98,8 +98,8 @@
 89	i386	readdir			sys_old_readdir			compat_sys_old_readdir
 90	i386	mmap			sys_old_mmap			sys32_mmap
 91	i386	munmap			sys_munmap
-92	i386	truncate		sys_truncate
-93	i386	ftruncate		sys_ftruncate
+92	i386	truncate		sys_truncate			compat_sys_truncate
+93	i386	ftruncate		sys_ftruncate			compat_sys_ftruncate
 94	i386	fchmod			sys_fchmod
 95	i386	fchown			sys_fchown16
 96	i386	getpriority		sys_getpriority

fs/open.c

@@ -30,6 +30,7 @@
 #include <linux/fs_struct.h>
 #include <linux/ima.h>
 #include <linux/dnotify.h>
+#include <linux/compat.h>
 
 #include "internal.h"
 
@@ -140,6 +141,13 @@ SYSCALL_DEFINE2(truncate, const char __user *, path, long, length)
 	return do_sys_truncate(path, length);
 }
 
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE2(truncate, const char __user *, path, compat_off_t, length)
+{
+	return do_sys_truncate(path, length);
+}
+#endif
+
 static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
 {
 	struct inode *inode;
@@ -195,6 +203,13 @@ SYSCALL_DEFINE2(ftruncate, unsigned int, fd, unsigned long, length)
 	return ret;
 }
 
+#ifdef CONFIG_COMPAT
+COMPAT_SYSCALL_DEFINE2(ftruncate, unsigned int, fd, compat_ulong_t, length)
+{
+	return do_sys_ftruncate(fd, length, 1);
+}
+#endif
+
 /* LFS versions of truncate are only needed on 32 bit machines */
 #if BITS_PER_LONG == 32
 SYSCALL_DEFINE(truncate64)(const char __user * path, loff_t length)

include/linux/compat.h

@@ -536,6 +536,8 @@ asmlinkage long compat_sys_openat(int dfd, const char __user *filename,
 asmlinkage long compat_sys_open_by_handle_at(int mountdirfd,
 					     struct file_handle __user *handle,
 					     int flags);
+asmlinkage long compat_sys_truncate(const char __user *, compat_off_t);
+asmlinkage long compat_sys_ftruncate(unsigned int, compat_ulong_t);
 asmlinkage long compat_sys_pselect6(int n, compat_ulong_t __user *inp,
 				    compat_ulong_t __user *outp,
 				    compat_ulong_t __user *exp,