X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Freaddir.c;h=7723401f8d8b58d43b780ed1d3ff1e5f38303b0d;hb=aed100fafb90aaabe8fb31e58af9dc7e68696507;hp=b03579bc021029ff86a81dd8bab5d9aafc3eec97;hpb=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2;p=safe%2Fjmp%2Flinux-2.6 diff --git a/fs/readdir.c b/fs/readdir.c index b03579b..7723401 100644 --- a/fs/readdir.c +++ b/fs/readdir.c @@ -4,13 +4,13 @@ * Copyright (C) 1995 Linus Torvalds */ +#include #include #include #include #include #include #include -#include #include #include #include @@ -21,7 +21,7 @@ int vfs_readdir(struct file *file, filldir_t filler, void *buf) { - struct inode *inode = file->f_dentry->d_inode; + struct inode *inode = file->f_path.dentry->d_inode; int res = -ENOTDIR; if (!file->f_op || !file->f_op->readdir) goto out; @@ -30,13 +30,16 @@ int vfs_readdir(struct file *file, filldir_t filler, void *buf) if (res) goto out; - down(&inode->i_sem); + res = mutex_lock_killable(&inode->i_mutex); + if (res) + goto out; + res = -ENOENT; if (!IS_DEADDIR(inode)) { res = file->f_op->readdir(file, buf, filler); file_accessed(file); } - up(&inode->i_sem); + mutex_unlock(&inode->i_mutex); out: return res; } @@ -52,7 +55,6 @@ EXPORT_SYMBOL(vfs_readdir); * case (the low-level handlers don't need to care about this). */ #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de))) -#define ROUND_UP(x) (((x)+sizeof(long)-1) & ~(sizeof(long)-1)) #ifdef __ARCH_WANT_OLD_READDIR @@ -69,20 +71,26 @@ struct readdir_callback { }; static int fillonedir(void * __buf, const char * name, int namlen, loff_t offset, - ino_t ino, unsigned int d_type) + u64 ino, unsigned int d_type) { struct readdir_callback * buf = (struct readdir_callback *) __buf; struct old_linux_dirent __user * dirent; + unsigned long d_ino; if (buf->result) return -EINVAL; + d_ino = ino; + if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { + buf->result = -EOVERFLOW; + return -EOVERFLOW; + } buf->result++; dirent = buf->dirent; if (!access_ok(VERIFY_WRITE, dirent, (unsigned long)(dirent->d_name + namlen + 1) - (unsigned long)dirent)) goto efault; - if ( __put_user(ino, &dirent->d_ino) || + if ( __put_user(d_ino, &dirent->d_ino) || __put_user(offset, &dirent->d_offset) || __put_user(namlen, &dirent->d_namlen) || __copy_to_user(dirent->d_name, name, namlen) || @@ -94,7 +102,8 @@ efault: return -EFAULT; } -asmlinkage long old_readdir(unsigned int fd, struct old_linux_dirent __user * dirent, unsigned int count) +SYSCALL_DEFINE3(old_readdir, unsigned int, fd, + struct old_linux_dirent __user *, dirent, unsigned int, count) { int error; struct file * file; @@ -109,7 +118,7 @@ asmlinkage long old_readdir(unsigned int fd, struct old_linux_dirent __user * di buf.dirent = dirent; error = vfs_readdir(file, fillonedir, &buf); - if (error >= 0) + if (buf.result) error = buf.result; fput(file); @@ -138,22 +147,28 @@ struct getdents_callback { }; static int filldir(void * __buf, const char * name, int namlen, loff_t offset, - ino_t ino, unsigned int d_type) + u64 ino, unsigned int d_type) { struct linux_dirent __user * dirent; struct getdents_callback * buf = (struct getdents_callback *) __buf; - int reclen = ROUND_UP(NAME_OFFSET(dirent) + namlen + 2); + unsigned long d_ino; + int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 2, sizeof(long)); buf->error = -EINVAL; /* only used if we fail.. */ if (reclen > buf->count) return -EINVAL; + d_ino = ino; + if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) { + buf->error = -EOVERFLOW; + return -EOVERFLOW; + } dirent = buf->previous; if (dirent) { if (__put_user(offset, &dirent->d_off)) goto efault; } dirent = buf->current_dir; - if (__put_user(ino, &dirent->d_ino)) + if (__put_user(d_ino, &dirent->d_ino)) goto efault; if (__put_user(reclen, &dirent->d_reclen)) goto efault; @@ -173,7 +188,8 @@ efault: return -EFAULT; } -asmlinkage long sys_getdents(unsigned int fd, struct linux_dirent __user * dirent, unsigned int count) +SYSCALL_DEFINE3(getdents, unsigned int, fd, + struct linux_dirent __user *, dirent, unsigned int, count) { struct file * file; struct linux_dirent __user * lastdirent; @@ -195,9 +211,8 @@ asmlinkage long sys_getdents(unsigned int fd, struct linux_dirent __user * diren buf.error = 0; error = vfs_readdir(file, filldir, &buf); - if (error < 0) - goto out_putf; - error = buf.error; + if (error >= 0) + error = buf.error; lastdirent = buf.previous; if (lastdirent) { if (put_user(file->f_pos, &lastdirent->d_off)) @@ -205,15 +220,11 @@ asmlinkage long sys_getdents(unsigned int fd, struct linux_dirent __user * diren else error = count - buf.count; } - -out_putf: fput(file); out: return error; } -#define ROUND_UP64(x) (((x)+sizeof(u64)-1) & ~(sizeof(u64)-1)) - struct getdents_callback64 { struct linux_dirent64 __user * current_dir; struct linux_dirent64 __user * previous; @@ -222,11 +233,11 @@ struct getdents_callback64 { }; static int filldir64(void * __buf, const char * name, int namlen, loff_t offset, - ino_t ino, unsigned int d_type) + u64 ino, unsigned int d_type) { struct linux_dirent64 __user *dirent; struct getdents_callback64 * buf = (struct getdents_callback64 *) __buf; - int reclen = ROUND_UP64(NAME_OFFSET(dirent) + namlen + 1); + int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 1, sizeof(u64)); buf->error = -EINVAL; /* only used if we fail.. */ if (reclen > buf->count) @@ -259,7 +270,8 @@ efault: return -EFAULT; } -asmlinkage long sys_getdents64(unsigned int fd, struct linux_dirent64 __user * dirent, unsigned int count) +SYSCALL_DEFINE3(getdents64, unsigned int, fd, + struct linux_dirent64 __user *, dirent, unsigned int, count) { struct file * file; struct linux_dirent64 __user * lastdirent; @@ -281,19 +293,16 @@ asmlinkage long sys_getdents64(unsigned int fd, struct linux_dirent64 __user * d buf.error = 0; error = vfs_readdir(file, filldir64, &buf); - if (error < 0) - goto out_putf; - error = buf.error; + if (error >= 0) + error = buf.error; lastdirent = buf.previous; if (lastdirent) { typeof(lastdirent->d_off) d_off = file->f_pos; - error = -EFAULT; if (__put_user(d_off, &lastdirent->d_off)) - goto out_putf; - error = count - buf.count; + error = -EFAULT; + else + error = count - buf.count; } - -out_putf: fput(file); out: return error;