From c43e259cc756ece387faae849af0058b56d78466 Mon Sep 17 00:00:00 2001 From: James Morris Date: Sat, 12 Jan 2008 22:05:48 +1100 Subject: security: call security_file_permission from rw_verify_area All instances of rw_verify_area() are followed by a call to security_file_permission(), so just call the latter from the former. Acked-by: Eric Paris Signed-off-by: James Morris --- fs/read_write.c | 63 ++++++++++++++++++++++----------------------------------- 1 file changed, 24 insertions(+), 39 deletions(-) (limited to 'fs/read_write.c') diff --git a/fs/read_write.c b/fs/read_write.c index ea1f94cc722e..c4d3d17923f1 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -197,25 +197,27 @@ int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count { struct inode *inode; loff_t pos; + int retval = -EINVAL; inode = file->f_path.dentry->d_inode; if (unlikely((ssize_t) count < 0)) - goto Einval; + return retval; pos = *ppos; if (unlikely((pos < 0) || (loff_t) (pos + count) < 0)) - goto Einval; + return retval; if (unlikely(inode->i_flock && mandatory_lock(inode))) { - int retval = locks_mandatory_area( + retval = locks_mandatory_area( read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE, inode, file, pos, count); if (retval < 0) return retval; } + retval = security_file_permission(file, + read_write == READ ? MAY_READ : MAY_WRITE); + if (retval) + return retval; return count > MAX_RW_COUNT ? MAX_RW_COUNT : count; - -Einval: - return -EINVAL; } static void wait_on_retry_sync_kiocb(struct kiocb *iocb) @@ -267,18 +269,15 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) ret = rw_verify_area(READ, file, pos, count); if (ret >= 0) { count = ret; - ret = security_file_permission (file, MAY_READ); - if (!ret) { - if (file->f_op->read) - ret = file->f_op->read(file, buf, count, pos); - else - ret = do_sync_read(file, buf, count, pos); - if (ret > 0) { - fsnotify_access(file->f_path.dentry); - add_rchar(current, ret); - } - inc_syscr(current); + if (file->f_op->read) + ret = file->f_op->read(file, buf, count, pos); + else + ret = do_sync_read(file, buf, count, pos); + if (ret > 0) { + fsnotify_access(file->f_path.dentry); + add_rchar(current, ret); } + inc_syscr(current); } return ret; @@ -325,18 +324,15 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_ ret = rw_verify_area(WRITE, file, pos, count); if (ret >= 0) { count = ret; - ret = security_file_permission (file, MAY_WRITE); - if (!ret) { - if (file->f_op->write) - ret = file->f_op->write(file, buf, count, pos); - else - ret = do_sync_write(file, buf, count, pos); - if (ret > 0) { - fsnotify_modify(file->f_path.dentry); - add_wchar(current, ret); - } - inc_syscw(current); + if (file->f_op->write) + ret = file->f_op->write(file, buf, count, pos); + else + ret = do_sync_write(file, buf, count, pos); + if (ret > 0) { + fsnotify_modify(file->f_path.dentry); + add_wchar(current, ret); } + inc_syscw(current); } return ret; @@ -603,9 +599,6 @@ static ssize_t do_readv_writev(int type, struct file *file, ret = rw_verify_area(type, file, pos, tot_len); if (ret < 0) goto out; - ret = security_file_permission(file, type == READ ? MAY_READ : MAY_WRITE); - if (ret) - goto out; fnv = NULL; if (type == READ) { @@ -737,10 +730,6 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, goto fput_in; count = retval; - retval = security_file_permission (in_file, MAY_READ); - if (retval) - goto fput_in; - /* * Get output file, and verify that it is ok.. */ @@ -759,10 +748,6 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, goto fput_out; count = retval; - retval = security_file_permission (out_file, MAY_WRITE); - if (retval) - goto fput_out; - if (!max) max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes); -- cgit v1.2.1