Mark arguments to certain syscalls as being const

Mark arguments to certain system calls as being const where they should be but
aren't.  The list includes:

 (*) The filename arguments of various stat syscalls, execve(), various utimes
     syscalls and some mount syscalls.

 (*) The filename arguments of some syscall helpers relating to the above.

 (*) The buffer argument of various write syscalls.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/alpha/kernel/osf_sys.c

@@ -244,7 +244,7 @@ do_osf_statfs(struct path *path, struct osf_statfs __user *buffer,
 	return error;	
 }
 
-SYSCALL_DEFINE3(osf_statfs, char __user *, pathname,
+SYSCALL_DEFINE3(osf_statfs, const char __user *, pathname,
 		struct osf_statfs __user *, buffer, unsigned long, bufsiz)
 {
 	struct path path;
@@ -358,7 +358,7 @@ osf_procfs_mount(char *dirname, struct procfs_args __user *args, int flags)
 	return do_mount("", dirname, "proc", flags, NULL);
 }
 
-SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, char __user *, path,
+SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
 		int, flag, void __user *, data)
 {
 	int retval;
@@ -932,7 +932,7 @@ SYSCALL_DEFINE3(osf_setitimer, int, which, struct itimerval32 __user *, in,
 
 }
 
-SYSCALL_DEFINE2(osf_utimes, char __user *, filename,
+SYSCALL_DEFINE2(osf_utimes, const char __user *, filename,
 		struct timeval32 __user *, tvs)
 {
 	struct timespec tv[2];

arch/alpha/kernel/process.c

@@ -387,7 +387,7 @@ EXPORT_SYMBOL(dump_elf_task_fp);
  * sys_execve() executes a new program.
  */
 asmlinkage int
-do_sys_execve(char __user *ufilename, char __user * __user *argv,
+do_sys_execve(const char __user *ufilename, char __user * __user *argv,
 	      char __user * __user *envp, struct pt_regs *regs)
 {
 	int error;

arch/arm/kernel/sys_arm.c

@@ -62,7 +62,7 @@ asmlinkage int sys_vfork(struct pt_regs *regs)
 /* sys_execve() executes a new program.
  * This is called indirectly via a small wrapper
  */
-asmlinkage int sys_execve(char __user *filenamei, char __user * __user *argv,
+asmlinkage int sys_execve(const char __user *filenamei, char __user * __user *argv,
 			  char __user * __user *envp, struct pt_regs *regs)
 {
 	int error;
@@ -84,7 +84,7 @@ int kernel_execve(const char *filename, char *const argv[], char *const envp[])
 	int ret;
 
 	memset(&regs, 0, sizeof(struct pt_regs));
-	ret = do_execve((char *)filename, (char __user * __user *)argv,
+	ret = do_execve(filename, (char __user * __user *)argv,
 			(char __user * __user *)envp, &regs);
 	if (ret < 0)
 		goto out;

arch/arm/kernel/sys_oabi-compat.c

@@ -141,7 +141,7 @@ static long cp_oldabi_stat64(struct kstat *stat,
 	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 }
 
-asmlinkage long sys_oabi_stat64(char __user * filename,
+asmlinkage long sys_oabi_stat64(const char __user * filename,
 				struct oldabi_stat64 __user * statbuf)
 {
 	struct kstat stat;
@@ -151,7 +151,7 @@ asmlinkage long sys_oabi_stat64(char __user * filename,
 	return error;
 }
 
-asmlinkage long sys_oabi_lstat64(char __user * filename,
+asmlinkage long sys_oabi_lstat64(const char __user * filename,
 				 struct oldabi_stat64 __user * statbuf)
 {
 	struct kstat stat;
@@ -172,7 +172,7 @@ asmlinkage long sys_oabi_fstat64(unsigned long fd,
 }
 
 asmlinkage long sys_oabi_fstatat64(int dfd,
-				   char __user *filename,
+				   const char __user *filename,
 				   struct oldabi_stat64  __user *statbuf,
 				   int flag)
 {

arch/avr32/include/asm/syscalls.h

@@ -21,7 +21,7 @@ asmlinkage int sys_clone(unsigned long, unsigned long,
 			 unsigned long, unsigned long,
 			 struct pt_regs *);
 asmlinkage int sys_vfork(struct pt_regs *);
-asmlinkage int sys_execve(char __user *, char __user *__user *,
+asmlinkage int sys_execve(const char __user *, char __user *__user *,
 			  char __user *__user *, struct pt_regs *);
 
 /* kernel/signal.c */

arch/avr32/kernel/process.c

@@ -383,7 +383,8 @@ asmlinkage int sys_vfork(struct pt_regs *regs)
 		       0, NULL, NULL);
 }
 
-asmlinkage int sys_execve(char __user *ufilename, char __user *__user *uargv,
+asmlinkage int sys_execve(const char __user *ufilename,
+			  char __user *__user *uargv,
 			  char __user *__user *uenvp, struct pt_regs *regs)
 {
 	int error;

arch/blackfin/kernel/process.c

@@ -209,7 +209,7 @@ copy_thread(unsigned long clone_flags,
 /*
  * sys_execve() executes a new program.
  */
-asmlinkage int sys_execve(char __user *name, char __user * __user *argv, char __user * __user *envp)
+asmlinkage int sys_execve(const char __user *name, char __user * __user *argv, char __user * __user *envp)
 {
 	int error;
 	char *filename;

arch/frv/kernel/process.c

@@ -250,7 +250,8 @@ int copy_thread(unsigned long clone_flags,
 /*
  * sys_execve() executes a new program.
  */
-asmlinkage int sys_execve(char __user *name, char __user * __user *argv, char __user * __user *envp)
+asmlinkage int sys_execve(const char __user *name, char __user * __user *argv,
+			  char __user * __user *envp)
 {
 	int error;
 	char * filename;

arch/h8300/kernel/process.c

@@ -212,7 +212,7 @@ int copy_thread(unsigned long clone_flags,
 /*
  * sys_execve() executes a new program.
  */
-asmlinkage int sys_execve(char *name, char **argv, char **envp,int dummy,...)
+asmlinkage int sys_execve(const char *name, char **argv, char **envp,int dummy,...)
 {
 	int error;
 	char * filename;

arch/ia64/include/asm/unistd.h

@@ -353,7 +353,7 @@ asmlinkage unsigned long sys_mmap2(
 				int fd, long pgoff);
 struct pt_regs;
 struct sigaction;
-long sys_execve(char __user *filename, char __user * __user *argv,
+long sys_execve(const char __user *filename, char __user * __user *argv,
 			   char __user * __user *envp, struct pt_regs *regs);
 asmlinkage long sys_ia64_pipe(void);
 asmlinkage long sys_rt_sigaction(int sig,

arch/ia64/kernel/process.c

@@ -633,7 +633,7 @@ dump_fpu (struct pt_regs *pt, elf_fpregset_t dst)
 }
 
 long
-sys_execve (char __user *filename, char __user * __user *argv, char __user * __user *envp,
+sys_execve (const char __user *filename, char __user * __user *argv, char __user * __user *envp,
 	    struct pt_regs *regs)
 {
 	char *fname;

arch/m32r/kernel/process.c

@@ -288,7 +288,8 @@ asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
 /*
  * sys_execve() executes a new program.
  */
-asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv,
+asmlinkage int sys_execve(const char __user *ufilename,
+			  char __user * __user *uargv,
 			  char __user * __user *uenvp,
 			  unsigned long r3, unsigned long r4, unsigned long r5,
 			  unsigned long r6, struct pt_regs regs)

arch/m68k/kernel/process.c

@@ -315,7 +315,7 @@ EXPORT_SYMBOL(dump_fpu);
 /*
  * sys_execve() executes a new program.
  */
-asmlinkage int sys_execve(char __user *name, char __user * __user *argv, char __user * __user *envp)
+asmlinkage int sys_execve(const char __user *name, char __user * __user *argv, char __user * __user *envp)
 {
 	int error;
 	char * filename;

arch/m68knommu/kernel/process.c

@@ -350,7 +350,7 @@ void dump(struct pt_regs *fp)
 /*
  * sys_execve() executes a new program.
  */
-asmlinkage int sys_execve(char *name, char **argv, char **envp)
+asmlinkage int sys_execve(const char *name, char **argv, char **envp)
 {
 	int error;
 	char * filename;

arch/microblaze/kernel/sys_microblaze.c

@@ -47,7 +47,7 @@ asmlinkage long microblaze_clone(int flags, unsigned long stack, struct pt_regs
 	return do_fork(flags, stack, regs, 0, NULL, NULL);
 }
 
-asmlinkage long microblaze_execve(char __user *filenamei, char __user *__user *argv,
+asmlinkage long microblaze_execve(const char __user *filenamei, char __user *__user *argv,
 			char __user *__user *envp, struct pt_regs *regs)
 {
 	int error;

arch/mips/kernel/syscall.c

@@ -254,7 +254,7 @@ asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
 	int error;
 	char * filename;
 
-	filename = getname((char __user *) (long)regs.regs[4]);
+	filename = getname((const char __user *) (long)regs.regs[4]);
 	error = PTR_ERR(filename);
 	if (IS_ERR(filename))
 		goto out;

arch/mn10300/kernel/process.c

@@ -268,7 +268,7 @@ asmlinkage long sys_vfork(void)
 		       0, NULL, NULL);
 }
 
-asmlinkage long sys_execve(char __user *name,
+asmlinkage long sys_execve(const char __user *name,
 			   char __user * __user *argv,
 			   char __user * __user *envp)
 {

arch/parisc/hpux/fs.c

@@ -36,7 +36,7 @@ int hpux_execve(struct pt_regs *regs)
 	int error;
 	char *filename;
 
-	filename = getname((char __user *) regs->gr[26]);
+	filename = getname((const char __user *) regs->gr[26]);
 	error = PTR_ERR(filename);
 	if (IS_ERR(filename))
 		goto out;
@@ -169,7 +169,7 @@ static int cp_hpux_stat(struct kstat *stat, struct hpux_stat64 __user *statbuf)
 	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 }
 
-long hpux_stat64(char __user *filename, struct hpux_stat64 __user *statbuf)
+long hpux_stat64(const char __user *filename, struct hpux_stat64 __user *statbuf)
 {
 	struct kstat stat;
 	int error = vfs_stat(filename, &stat);
@@ -191,7 +191,8 @@ long hpux_fstat64(unsigned int fd, struct hpux_stat64 __user *statbuf)
 	return error;
 }
 
-long hpux_lstat64(char __user *filename, struct hpux_stat64 __user *statbuf)
+long hpux_lstat64(const char __user *filename,
+		  struct hpux_stat64 __user *statbuf)
 {
 	struct kstat stat;
 	int error = vfs_lstat(filename, &stat);

arch/powerpc/kernel/process.c

@@ -1027,7 +1027,7 @@ int sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
 	int error;
 	char *filename;
 
-	filename = getname((char __user *) a0);
+	filename = getname((const char __user *) a0);
 	error = PTR_ERR(filename);
 	if (IS_ERR(filename))
 		goto out;

arch/powerpc/kernel/sys_ppc32.c

@@ -546,7 +546,7 @@ compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_siz
 	return sys_pread64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
 }
 
-compat_ssize_t compat_sys_pwrite64(unsigned int fd, char __user *ubuf, compat_size_t count,
+compat_ssize_t compat_sys_pwrite64(unsigned int fd, const char __user *ubuf, compat_size_t count,
 			      u32 reg6, u32 poshi, u32 poslo)
 {
 	return sys_pwrite64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);

arch/s390/kernel/compat_linux.c

@@ -436,7 +436,7 @@ sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
  * sys32_execve() executes a new program after the asm stub has set
  * things up for us.  This should basically do what I want it to.
  */
-asmlinkage long sys32_execve(char __user *name, compat_uptr_t __user *argv,
+asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
 			     compat_uptr_t __user *envp)
 {
 	struct pt_regs *regs = task_pt_regs(current);
@@ -570,7 +570,7 @@ static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
 	return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 
 }
 
-asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
+asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
 {
 	struct kstat stat;
 	int ret = vfs_stat(filename, &stat);
@@ -579,7 +579,7 @@ asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user
 	return ret;
 }
 
-asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
+asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
 {
 	struct kstat stat;
 	int ret = vfs_lstat(filename, &stat);
@@ -597,7 +597,7 @@ asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * sta
 	return ret;
 }
 
-asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
+asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
 				struct stat64_emu31 __user* statbuf, int flag)
 {
 	struct kstat stat;
@@ -655,7 +655,7 @@ asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
 	return sys_read(fd, buf, count);
 }
 
-asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
+asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
 {
 	if ((compat_ssize_t) count < 0)
 		return -EINVAL; 

arch/s390/kernel/compat_linux.h

@@ -193,7 +193,7 @@ long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
 			  compat_sigset_t __user *oset, size_t sigsetsize);
 long sys32_rt_sigpending(compat_sigset_t __user *set, size_t sigsetsize);
 long sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo);
-long sys32_execve(char __user *name, compat_uptr_t __user *argv,
+long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
 		  compat_uptr_t __user *envp);
 long sys32_init_module(void __user *umod, unsigned long len,
 		       const char __user *uargs);
@@ -207,16 +207,16 @@ long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset,
 		    size_t count);
 long sys32_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset,
 		      s32 count);
-long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf);
-long sys32_lstat64(char __user * filename,
+long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf);
+long sys32_lstat64(const char __user * filename,
 		   struct stat64_emu31 __user * statbuf);
 long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf);
-long sys32_fstatat64(unsigned int dfd, char __user *filename,
+long sys32_fstatat64(unsigned int dfd, const char __user *filename,
 		     struct stat64_emu31 __user* statbuf, int flag);
 unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg);
 long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg);
 long sys32_read(unsigned int fd, char __user * buf, size_t count);
-long sys32_write(unsigned int fd, char __user * buf, size_t count);
+long sys32_write(unsigned int fd, const char __user * buf, size_t count);
 long sys32_fadvise64(int fd, loff_t offset, size_t len, int advise);
 long sys32_fadvise64_64(struct fadvise64_64_args __user *args);
 long sys32_sigaction(int sig, const struct old_sigaction32 __user *act,

arch/s390/kernel/entry.h

@@ -42,7 +42,7 @@ long sys_clone(unsigned long newsp, unsigned long clone_flags,
 	       int __user *parent_tidptr, int __user *child_tidptr);
 long sys_vfork(void);
 void execve_tail(void);
-long sys_execve(char __user *name, char __user * __user *argv,
+long sys_execve(const char __user *name, char __user * __user *argv,
 		char __user * __user *envp);
 long sys_sigsuspend(int history0, int history1, old_sigset_t mask);
 long sys_sigaction(int sig, const struct old_sigaction __user *act,

arch/s390/kernel/process.c

@@ -267,7 +267,7 @@ asmlinkage void execve_tail(void)
 /*
  * sys_execve() executes a new program.
  */
-SYSCALL_DEFINE3(execve, char __user *, name, char __user * __user *, argv,
+SYSCALL_DEFINE3(execve, const char __user *, name, char __user * __user *, argv,
 		char __user * __user *, envp)
 {
 	struct pt_regs *regs = task_pt_regs(current);

arch/sh/include/asm/syscalls_32.h

@@ -19,7 +19,7 @@ asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
 asmlinkage int sys_vfork(unsigned long r4, unsigned long r5,
 			 unsigned long r6, unsigned long r7,
 			 struct pt_regs __regs);
-asmlinkage int sys_execve(char __user *ufilename, char __user * __user *uargv,
+asmlinkage int sys_execve(const char __user *ufilename, char __user * __user *uargv,
 			  char __user * __user *uenvp, unsigned long r7,
 			  struct pt_regs __regs);
 asmlinkage int sys_sigsuspend(old_sigset_t mask, unsigned long r5,

arch/sh/include/asm/syscalls_64.h

@@ -21,7 +21,7 @@ asmlinkage int sys_vfork(unsigned long r2, unsigned long r3,
 			 unsigned long r4, unsigned long r5,
 			 unsigned long r6, unsigned long r7,
 			 struct pt_regs *pregs);
-asmlinkage int sys_execve(char *ufilename, char **uargv,
+asmlinkage int sys_execve(const char *ufilename, char **uargv,
 			  char **uenvp, unsigned long r5,
 			  unsigned long r6, unsigned long r7,
 			  struct pt_regs *pregs);

arch/sh/kernel/process_64.c

@@ -483,7 +483,7 @@ asmlinkage int sys_vfork(unsigned long r2, unsigned long r3,
 /*
  * sys_execve() executes a new program.
  */
-asmlinkage int sys_execve(char *ufilename, char **uargv,
+asmlinkage int sys_execve(const char *ufilename, char **uargv,
 			  char **uenvp, unsigned long r5,
 			  unsigned long r6, unsigned long r7,
 			  struct pt_regs *pregs)

arch/sparc/kernel/sys_sparc32.c

@@ -162,7 +162,7 @@ static int cp_compat_stat64(struct kstat *stat,
 	return err;
 }
 
-asmlinkage long compat_sys_stat64(char __user * filename,
+asmlinkage long compat_sys_stat64(const char __user * filename,
 		struct compat_stat64 __user *statbuf)
 {
 	struct kstat stat;
@@ -173,7 +173,7 @@ asmlinkage long compat_sys_stat64(char __user * filename,
 	return error;
 }
 
-asmlinkage long compat_sys_lstat64(char __user * filename,
+asmlinkage long compat_sys_lstat64(const char __user * filename,
 		struct compat_stat64 __user *statbuf)
 {
 	struct kstat stat;
@@ -195,7 +195,8 @@ asmlinkage long compat_sys_fstat64(unsigned int fd,
 	return error;
 }
 
-asmlinkage long compat_sys_fstatat64(unsigned int dfd, char __user *filename,
+asmlinkage long compat_sys_fstatat64(unsigned int dfd,
+		const char __user *filename,
 		struct compat_stat64 __user * statbuf, int flag)
 {
 	struct kstat stat;