statfs: move compat syscalls from compat.c
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
1a060ba3c8
commit
4ada54ee7a
2 changed files with 140 additions and 138 deletions
138
fs/compat.c
138
fs/compat.c
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@ -137,144 +137,6 @@ COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
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return error;
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}
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static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
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{
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if (sizeof ubuf->f_blocks == 4) {
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if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
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kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
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return -EOVERFLOW;
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/* f_files and f_ffree may be -1; it's okay
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* to stuff that into 32 bits */
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if (kbuf->f_files != 0xffffffffffffffffULL
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&& (kbuf->f_files & 0xffffffff00000000ULL))
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return -EOVERFLOW;
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if (kbuf->f_ffree != 0xffffffffffffffffULL
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&& (kbuf->f_ffree & 0xffffffff00000000ULL))
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return -EOVERFLOW;
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}
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if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
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__put_user(kbuf->f_type, &ubuf->f_type) ||
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__put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
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__put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
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__put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
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__put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
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__put_user(kbuf->f_files, &ubuf->f_files) ||
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__put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
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__put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
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__put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
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__put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
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__put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
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__put_user(kbuf->f_flags, &ubuf->f_flags) ||
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__clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
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return -EFAULT;
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return 0;
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}
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/*
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* The following statfs calls are copies of code from fs/statfs.c and
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* should be checked against those from time to time
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*/
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COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf)
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{
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struct kstatfs tmp;
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int error = user_statfs(pathname, &tmp);
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if (!error)
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error = put_compat_statfs(buf, &tmp);
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return error;
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}
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COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
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{
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struct kstatfs tmp;
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int error = fd_statfs(fd, &tmp);
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if (!error)
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error = put_compat_statfs(buf, &tmp);
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return error;
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}
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static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
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{
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if (sizeof(ubuf->f_bsize) == 4) {
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if ((kbuf->f_type | kbuf->f_bsize | kbuf->f_namelen |
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kbuf->f_frsize | kbuf->f_flags) & 0xffffffff00000000ULL)
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return -EOVERFLOW;
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/* f_files and f_ffree may be -1; it's okay
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* to stuff that into 32 bits */
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if (kbuf->f_files != 0xffffffffffffffffULL
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&& (kbuf->f_files & 0xffffffff00000000ULL))
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return -EOVERFLOW;
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if (kbuf->f_ffree != 0xffffffffffffffffULL
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&& (kbuf->f_ffree & 0xffffffff00000000ULL))
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return -EOVERFLOW;
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}
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if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
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__put_user(kbuf->f_type, &ubuf->f_type) ||
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__put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
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__put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
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__put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
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__put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
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__put_user(kbuf->f_files, &ubuf->f_files) ||
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__put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
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__put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
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__put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
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__put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
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__put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
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__put_user(kbuf->f_flags, &ubuf->f_flags) ||
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__clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
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return -EFAULT;
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return 0;
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}
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COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf)
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{
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struct kstatfs tmp;
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int error;
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if (sz != sizeof(*buf))
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return -EINVAL;
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error = user_statfs(pathname, &tmp);
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if (!error)
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error = put_compat_statfs64(buf, &tmp);
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return error;
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}
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COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
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{
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struct kstatfs tmp;
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int error;
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if (sz != sizeof(*buf))
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return -EINVAL;
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error = fd_statfs(fd, &tmp);
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if (!error)
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error = put_compat_statfs64(buf, &tmp);
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return error;
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}
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/*
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* This is a copy of sys_ustat, just dealing with a structure layout.
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* Given how simple this syscall is that apporach is more maintainable
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* than the various conversion hacks.
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*/
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COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
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{
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struct compat_ustat tmp;
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struct kstatfs sbuf;
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int err = vfs_ustat(new_decode_dev(dev), &sbuf);
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if (err)
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return err;
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memset(&tmp, 0, sizeof(struct compat_ustat));
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tmp.f_tfree = sbuf.f_bfree;
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tmp.f_tinode = sbuf.f_ffree;
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if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
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return -EFAULT;
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return 0;
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}
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static int get_compat_flock(struct flock *kfl, struct compat_flock __user *ufl)
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{
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if (!access_ok(VERIFY_READ, ufl, sizeof(*ufl)) ||
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140
fs/statfs.c
140
fs/statfs.c
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@ -7,6 +7,7 @@
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#include <linux/statfs.h>
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#include <linux/security.h>
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#include <linux/uaccess.h>
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#include <linux/compat.h>
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#include "internal.h"
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static int flags_by_mnt(int mnt_flags)
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@ -239,3 +240,142 @@ SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
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return copy_to_user(ubuf, &tmp, sizeof(struct ustat)) ? -EFAULT : 0;
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}
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#ifdef CONFIG_COMPAT
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static int put_compat_statfs(struct compat_statfs __user *ubuf, struct kstatfs *kbuf)
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{
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if (sizeof ubuf->f_blocks == 4) {
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if ((kbuf->f_blocks | kbuf->f_bfree | kbuf->f_bavail |
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kbuf->f_bsize | kbuf->f_frsize) & 0xffffffff00000000ULL)
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return -EOVERFLOW;
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/* f_files and f_ffree may be -1; it's okay
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* to stuff that into 32 bits */
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if (kbuf->f_files != 0xffffffffffffffffULL
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&& (kbuf->f_files & 0xffffffff00000000ULL))
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return -EOVERFLOW;
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if (kbuf->f_ffree != 0xffffffffffffffffULL
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&& (kbuf->f_ffree & 0xffffffff00000000ULL))
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return -EOVERFLOW;
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}
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if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
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__put_user(kbuf->f_type, &ubuf->f_type) ||
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__put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
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__put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
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__put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
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__put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
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__put_user(kbuf->f_files, &ubuf->f_files) ||
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__put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
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__put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
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__put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
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__put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
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__put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
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__put_user(kbuf->f_flags, &ubuf->f_flags) ||
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__clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
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return -EFAULT;
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return 0;
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}
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/*
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* The following statfs calls are copies of code from fs/statfs.c and
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* should be checked against those from time to time
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*/
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COMPAT_SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct compat_statfs __user *, buf)
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{
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struct kstatfs tmp;
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int error = user_statfs(pathname, &tmp);
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if (!error)
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error = put_compat_statfs(buf, &tmp);
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return error;
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}
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COMPAT_SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct compat_statfs __user *, buf)
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{
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struct kstatfs tmp;
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int error = fd_statfs(fd, &tmp);
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if (!error)
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error = put_compat_statfs(buf, &tmp);
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return error;
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}
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static int put_compat_statfs64(struct compat_statfs64 __user *ubuf, struct kstatfs *kbuf)
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{
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if (sizeof(ubuf->f_bsize) == 4) {
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if ((kbuf->f_type | kbuf->f_bsize | kbuf->f_namelen |
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kbuf->f_frsize | kbuf->f_flags) & 0xffffffff00000000ULL)
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return -EOVERFLOW;
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/* f_files and f_ffree may be -1; it's okay
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* to stuff that into 32 bits */
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if (kbuf->f_files != 0xffffffffffffffffULL
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&& (kbuf->f_files & 0xffffffff00000000ULL))
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return -EOVERFLOW;
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if (kbuf->f_ffree != 0xffffffffffffffffULL
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&& (kbuf->f_ffree & 0xffffffff00000000ULL))
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return -EOVERFLOW;
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}
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if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)) ||
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__put_user(kbuf->f_type, &ubuf->f_type) ||
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__put_user(kbuf->f_bsize, &ubuf->f_bsize) ||
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__put_user(kbuf->f_blocks, &ubuf->f_blocks) ||
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__put_user(kbuf->f_bfree, &ubuf->f_bfree) ||
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__put_user(kbuf->f_bavail, &ubuf->f_bavail) ||
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__put_user(kbuf->f_files, &ubuf->f_files) ||
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__put_user(kbuf->f_ffree, &ubuf->f_ffree) ||
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__put_user(kbuf->f_namelen, &ubuf->f_namelen) ||
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__put_user(kbuf->f_fsid.val[0], &ubuf->f_fsid.val[0]) ||
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__put_user(kbuf->f_fsid.val[1], &ubuf->f_fsid.val[1]) ||
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__put_user(kbuf->f_frsize, &ubuf->f_frsize) ||
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__put_user(kbuf->f_flags, &ubuf->f_flags) ||
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__clear_user(ubuf->f_spare, sizeof(ubuf->f_spare)))
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return -EFAULT;
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return 0;
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}
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COMPAT_SYSCALL_DEFINE3(statfs64, const char __user *, pathname, compat_size_t, sz, struct compat_statfs64 __user *, buf)
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{
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struct kstatfs tmp;
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int error;
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if (sz != sizeof(*buf))
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return -EINVAL;
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error = user_statfs(pathname, &tmp);
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if (!error)
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error = put_compat_statfs64(buf, &tmp);
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return error;
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}
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COMPAT_SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, compat_size_t, sz, struct compat_statfs64 __user *, buf)
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{
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struct kstatfs tmp;
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int error;
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if (sz != sizeof(*buf))
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return -EINVAL;
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error = fd_statfs(fd, &tmp);
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if (!error)
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error = put_compat_statfs64(buf, &tmp);
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return error;
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}
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/*
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* This is a copy of sys_ustat, just dealing with a structure layout.
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* Given how simple this syscall is that apporach is more maintainable
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* than the various conversion hacks.
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*/
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COMPAT_SYSCALL_DEFINE2(ustat, unsigned, dev, struct compat_ustat __user *, u)
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{
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struct compat_ustat tmp;
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struct kstatfs sbuf;
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int err = vfs_ustat(new_decode_dev(dev), &sbuf);
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if (err)
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return err;
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memset(&tmp, 0, sizeof(struct compat_ustat));
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tmp.f_tfree = sbuf.f_bfree;
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tmp.f_tinode = sbuf.f_ffree;
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if (copy_to_user(u, &tmp, sizeof(struct compat_ustat)))
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return -EFAULT;
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return 0;
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}
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#endif
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