[CVE-2009-0029] System call wrapper special cases

System calls with an unsigned long long argument can't be converted with
the standard wrappers since that would include a cast to long, which in
turn means that we would lose the upper 32 bit on 32 bit architectures.
Also semctl can't use the standard wrapper since it has a 'union'
parameter.

So we handle them as special case and add some extra wrappers instead.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

diff --git a/fs/dcookies.c b/fs/dcookies.c
index 180e9fe..a21cabd 100644 (file)
--- a/fs/dcookies.c
+++ b/fs/dcookies.c
@@ -145,7 +145,7 @@ out:
 /* And here is where the userspace process can look up the cookie value
  * to retrieve the path.
  */
-asmlinkage long sys_lookup_dcookie(u64 cookie64, char __user * buf, size_t len)
+SYSCALL_DEFINE(lookup_dcookie)(u64 cookie64, char __user * buf, size_t len)
 {
        unsigned long cookie = (unsigned long)cookie64;
        int err = -EINVAL;
@@ -198,7 +198,13 @@ out:
        mutex_unlock(&dcookie_mutex);
        return err;
 }
-
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_lookup_dcookie(u64 cookie64, long buf, long len)
+{
+       return SYSC_lookup_dcookie(cookie64, (char __user *) buf, (size_t) len);
+}
+SYSCALL_ALIAS(sys_lookup_dcookie, SyS_lookup_dcookie);
+#endif
 
 static int dcookie_init(void)
 {

diff --git a/fs/open.c b/fs/open.c
index d882fd2..e349013 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -351,21 +351,35 @@ asmlinkage long sys_ftruncate(unsigned int fd, unsigned long length)
 
 /* LFS versions of truncate are only needed on 32 bit machines */
 #if BITS_PER_LONG == 32
-asmlinkage long sys_truncate64(const char __user * path, loff_t length)
+SYSCALL_DEFINE(truncate64)(const char __user * path, loff_t length)
 {
        return do_sys_truncate(path, length);
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_truncate64(long path, loff_t length)
+{
+       return SYSC_truncate64((const char __user *) path, length);
+}
+SYSCALL_ALIAS(sys_truncate64, SyS_truncate64);
+#endif
 
-asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length)
+SYSCALL_DEFINE(ftruncate64)(unsigned int fd, loff_t length)
 {
        long ret = do_sys_ftruncate(fd, length, 0);
        /* avoid REGPARM breakage on x86: */
        asmlinkage_protect(2, ret, fd, length);
        return ret;
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_ftruncate64(long fd, loff_t length)
+{
+       return SYSC_ftruncate64((unsigned int) fd, length);
+}
+SYSCALL_ALIAS(sys_ftruncate64, SyS_ftruncate64);
 #endif
+#endif /* BITS_PER_LONG == 32 */
 
-asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len)
+SYSCALL_DEFINE(fallocate)(int fd, int mode, loff_t offset, loff_t len)
 {
        struct file *file;
        struct inode *inode;
@@ -422,6 +436,13 @@ out_fput:
 out:
        return ret;
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_fallocate(long fd, long mode, loff_t offset, loff_t len)
+{
+       return SYSC_fallocate((int)fd, (int)mode, offset, len);
+}
+SYSCALL_ALIAS(sys_fallocate, SyS_fallocate);
+#endif
 
 /*
  * access() needs to use the real uid/gid, not the effective uid/gid.

diff --git a/fs/read_write.c b/fs/read_write.c
index 940367f..7a8326b 100644 (file)
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -403,8 +403,8 @@ asmlinkage long sys_write(unsigned int fd, const char __user * buf, size_t count
        return ret;
 }
 
-asmlinkage long sys_pread64(unsigned int fd, char __user *buf,
-                            size_t count, loff_t pos)
+SYSCALL_DEFINE(pread64)(unsigned int fd, char __user *buf,
+                       size_t count, loff_t pos)
 {
        struct file *file;
        ssize_t ret = -EBADF;
@@ -423,9 +423,17 @@ asmlinkage long sys_pread64(unsigned int fd, char __user *buf,
 
        return ret;
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_pread64(long fd, long buf, long count, loff_t pos)
+{
+       return SYSC_pread64((unsigned int) fd, (char __user *) buf,
+                           (size_t) count, pos);
+}
+SYSCALL_ALIAS(sys_pread64, SyS_pread64);
+#endif
 
-asmlinkage long sys_pwrite64(unsigned int fd, const char __user *buf,
-                             size_t count, loff_t pos)
+SYSCALL_DEFINE(pwrite64)(unsigned int fd, const char __user *buf,
+                        size_t count, loff_t pos)
 {
        struct file *file;
        ssize_t ret = -EBADF;
@@ -444,6 +452,14 @@ asmlinkage long sys_pwrite64(unsigned int fd, const char __user *buf,
 
        return ret;
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_pwrite64(long fd, long buf, long count, loff_t pos)
+{
+       return SYSC_pwrite64((unsigned int) fd, (const char __user *) buf,
+                            (size_t) count, pos);
+}
+SYSCALL_ALIAS(sys_pwrite64, SyS_pwrite64);
+#endif
 
 /*
  * Reduce an iovec's length in-place.  Return the resulting number of segments

diff --git a/fs/sync.c b/fs/sync.c
index ac02b56..23ebbd7 100644 (file)
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -201,8 +201,8 @@ asmlinkage long sys_fdatasync(unsigned int fd)
  * already-instantiated disk blocks, there are no guarantees here that the data
  * will be available after a crash.
  */
-asmlinkage long sys_sync_file_range(int fd, loff_t offset, loff_t nbytes,
-                                       unsigned int flags)
+SYSCALL_DEFINE(sync_file_range)(int fd, loff_t offset, loff_t nbytes,
+                               unsigned int flags)
 {
        int ret;
        struct file *file;
@@ -262,14 +262,32 @@ out_put:
 out:
        return ret;
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_sync_file_range(long fd, loff_t offset, loff_t nbytes,
+                                   long flags)
+{
+       return SYSC_sync_file_range((int) fd, offset, nbytes,
+                                   (unsigned int) flags);
+}
+SYSCALL_ALIAS(sys_sync_file_range, SyS_sync_file_range);
+#endif
 
 /* It would be nice if people remember that not all the world's an i386
    when they introduce new system calls */
-asmlinkage long sys_sync_file_range2(int fd, unsigned int flags,
-                                    loff_t offset, loff_t nbytes)
+SYSCALL_DEFINE(sync_file_range2)(int fd, unsigned int flags,
+                                loff_t offset, loff_t nbytes)
 {
        return sys_sync_file_range(fd, offset, nbytes, flags);
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_sync_file_range2(long fd, long flags,
+                                    loff_t offset, loff_t nbytes)
+{
+       return SYSC_sync_file_range2((int) fd, (unsigned int) flags,
+                                    offset, nbytes);
+}
+SYSCALL_ALIAS(sys_sync_file_range2, SyS_sync_file_range2);
+#endif
 
 /*
  * `endbyte' is inclusive

diff --git a/ipc/sem.c b/ipc/sem.c
index c68cd3f..c385c40 100644 (file)
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -887,7 +887,7 @@ out_up:
        return err;
 }
 
-asmlinkage long sys_semctl (int semid, int semnum, int cmd, union semun arg)
+SYSCALL_DEFINE(semctl)(int semid, int semnum, int cmd, union semun arg)
 {
        int err = -EINVAL;
        int version;
@@ -923,6 +923,13 @@ asmlinkage long sys_semctl (int semid, int semnum, int cmd, union semun arg)
                return -EINVAL;
        }
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_semctl(int semid, int semnum, int cmd, union semun arg)
+{
+       return SYSC_semctl((int) semid, (int) semnum, (int) cmd, arg);
+}
+SYSCALL_ALIAS(sys_semctl, SyS_semctl);
+#endif
 
 /* If the task doesn't already have a undo_list, then allocate one
  * here.  We guarantee there is only one thread using this undo list,

diff --git a/mm/fadvise.c b/mm/fadvise.c
index a1da969..54a0f80 100644 (file)
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -24,7 +24,7 @@
  * POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
  * deactivate the pages and clear PG_Referenced.
  */
-asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice)
+SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
 {
        struct file *file = fget(fd);
        struct address_space *mapping;
@@ -126,12 +126,26 @@ out:
        fput(file);
        return ret;
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_fadvise64_64(long fd, loff_t offset, loff_t len, long advice)
+{
+       return SYSC_fadvise64_64((int) fd, offset, len, (int) advice);
+}
+SYSCALL_ALIAS(sys_fadvise64_64, SyS_fadvise64_64);
+#endif
 
 #ifdef __ARCH_WANT_SYS_FADVISE64
 
-asmlinkage long sys_fadvise64(int fd, loff_t offset, size_t len, int advice)
+SYSCALL_DEFINE(fadvise64)(int fd, loff_t offset, size_t len, int advice)
 {
        return sys_fadvise64_64(fd, offset, len, advice);
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_fadvise64(long fd, loff_t offset, long len, long advice)
+{
+       return SYSC_fadvise64((int) fd, offset, (size_t)len, (int)advice);
+}
+SYSCALL_ALIAS(sys_fadvise64, SyS_fadvise64);
+#endif
 
 #endif

diff --git a/mm/filemap.c b/mm/filemap.c
index 538b75e..23acefe 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1374,7 +1374,7 @@ do_readahead(struct address_space *mapping, struct file *filp,
        return 0;
 }
 
-asmlinkage long sys_readahead(int fd, loff_t offset, size_t count)
+SYSCALL_DEFINE(readahead)(int fd, loff_t offset, size_t count)
 {
        ssize_t ret;
        struct file *file;
@@ -1393,6 +1393,13 @@ asmlinkage long sys_readahead(int fd, loff_t offset, size_t count)
        }
        return ret;
 }
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_readahead(long fd, loff_t offset, long count)
+{
+       return SYSC_readahead((int) fd, offset, (size_t) count);
+}
+SYSCALL_ALIAS(sys_readahead, SyS_readahead);
+#endif
 
 #ifdef CONFIG_MMU
 /**