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compat: move cp_compat_stat to common code
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struct stat / compat_stat is the same on all architectures, so
cp_compat_stat should be, too.

Turns out it is, except that various architectures have slightly and some
high2lowuid/high2lowgid or the direct assignment instead of the
SET_UID/SET_GID that expands to the correct one anyway.

This patch replaces the arch-specific cp_compat_stat implementations with
a common one based on the x86-64 one.

Signed-off-by: Christoph Hellwig <[email protected]>
Acked-by: David S. Miller <[email protected]> [ sparc bits ]
Acked-by: Kyle McMartin <[email protected]> [ parisc bits ]
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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@torvalds
Christoph Hellwig authored and torvalds committed Oct 16, 2008
1 parent f7ad160 commit f7a5000
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Showing 9 changed files with 39 additions and 259 deletions.
35 changes: 0 additions & 35 deletions arch/ia64/ia32/sys_ia32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -118,41 +118,6 @@ sys32_execve (char __user *name, compat_uptr_t __user *argv, compat_uptr_t __use
return error;
}

int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
{
compat_ino_t ino;
int err;

if ((u64) stat->size > MAX_NON_LFS ||
!old_valid_dev(stat->dev) ||
!old_valid_dev(stat->rdev))
return -EOVERFLOW;

ino = stat->ino;
if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
return -EOVERFLOW;

if (clear_user(ubuf, sizeof(*ubuf)))
return -EFAULT;

err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
err |= __put_user(ino, &ubuf->st_ino);
err |= __put_user(stat->mode, &ubuf->st_mode);
err |= __put_user(stat->nlink, &ubuf->st_nlink);
err |= __put_user(high2lowuid(stat->uid), &ubuf->st_uid);
err |= __put_user(high2lowgid(stat->gid), &ubuf->st_gid);
err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
err |= __put_user(stat->size, &ubuf->st_size);
err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
err |= __put_user(stat->blksize, &ubuf->st_blksize);
err |= __put_user(stat->blocks, &ubuf->st_blocks);
return err;
}

#if PAGE_SHIFT > IA32_PAGE_SHIFT

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35 changes: 0 additions & 35 deletions arch/mips/kernel/linux32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -63,41 +63,6 @@
#define merge_64(r1, r2) ((((r2) & 0xffffffffUL) << 32) + ((r1) & 0xffffffffUL))
#endif

/*
* Revalidate the inode. This is required for proper NFS attribute caching.
*/

int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
{
struct compat_stat tmp;

if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
return -EOVERFLOW;

memset(&tmp, 0, sizeof(tmp));
tmp.st_dev = new_encode_dev(stat->dev);
tmp.st_ino = stat->ino;
if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
return -EOVERFLOW;
tmp.st_mode = stat->mode;
tmp.st_nlink = stat->nlink;
SET_UID(tmp.st_uid, stat->uid);
SET_GID(tmp.st_gid, stat->gid);
tmp.st_rdev = new_encode_dev(stat->rdev);
tmp.st_size = stat->size;
tmp.st_atime = stat->atime.tv_sec;
tmp.st_mtime = stat->mtime.tv_sec;
tmp.st_ctime = stat->ctime.tv_sec;
#ifdef STAT_HAVE_NSEC
tmp.st_atime_nsec = stat->atime.tv_nsec;
tmp.st_mtime_nsec = stat->mtime.tv_nsec;
tmp.st_ctime_nsec = stat->ctime.tv_nsec;
#endif
tmp.st_blocks = stat->blocks;
tmp.st_blksize = stat->blksize;
return copy_to_user(statbuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
}

asmlinkage unsigned long
sys32_mmap2(unsigned long addr, unsigned long len, unsigned long prot,
unsigned long flags, unsigned long fd, unsigned long pgoff)
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47 changes: 0 additions & 47 deletions arch/parisc/kernel/sys_parisc32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -237,53 +237,6 @@ int sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user
return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
}

int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
{
compat_ino_t ino;
int err;

if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
!new_valid_dev(stat->rdev))
return -EOVERFLOW;

ino = stat->ino;
if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
return -EOVERFLOW;

err = put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
err |= put_user(ino, &statbuf->st_ino);
err |= put_user(stat->mode, &statbuf->st_mode);
err |= put_user(stat->nlink, &statbuf->st_nlink);
err |= put_user(0, &statbuf->st_reserved1);
err |= put_user(0, &statbuf->st_reserved2);
err |= put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
err |= put_user(stat->size, &statbuf->st_size);
err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
err |= put_user(stat->blksize, &statbuf->st_blksize);
err |= put_user(stat->blocks, &statbuf->st_blocks);
err |= put_user(0, &statbuf->__unused1);
err |= put_user(0, &statbuf->__unused2);
err |= put_user(0, &statbuf->__unused3);
err |= put_user(0, &statbuf->__unused4);
err |= put_user(0, &statbuf->__unused5);
err |= put_user(0, &statbuf->st_fstype); /* not avail */
err |= put_user(0, &statbuf->st_realdev); /* not avail */
err |= put_user(0, &statbuf->st_basemode); /* not avail */
err |= put_user(0, &statbuf->st_spareshort);
err |= put_user(stat->uid, &statbuf->st_uid);
err |= put_user(stat->gid, &statbuf->st_gid);
err |= put_user(0, &statbuf->st_spare4[0]);
err |= put_user(0, &statbuf->st_spare4[1]);
err |= put_user(0, &statbuf->st_spare4[2]);

return err;
}

/*** copied from mips64 ***/
/*
* Ooo, nasty. We need here to frob 32-bit unsigned longs to
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36 changes: 0 additions & 36 deletions arch/powerpc/kernel/sys_ppc32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -61,42 +61,6 @@ asmlinkage long ppc32_select(u32 n, compat_ulong_t __user *inp,
return compat_sys_select((int)n, inp, outp, exp, compat_ptr(tvp_x));
}

int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
{
compat_ino_t ino;
long err;

if (stat->size > MAX_NON_LFS || !new_valid_dev(stat->dev) ||
!new_valid_dev(stat->rdev))
return -EOVERFLOW;

ino = stat->ino;
if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
return -EOVERFLOW;

err = access_ok(VERIFY_WRITE, statbuf, sizeof(*statbuf)) ? 0 : -EFAULT;
err |= __put_user(new_encode_dev(stat->dev), &statbuf->st_dev);
err |= __put_user(ino, &statbuf->st_ino);
err |= __put_user(stat->mode, &statbuf->st_mode);
err |= __put_user(stat->nlink, &statbuf->st_nlink);
err |= __put_user(stat->uid, &statbuf->st_uid);
err |= __put_user(stat->gid, &statbuf->st_gid);
err |= __put_user(new_encode_dev(stat->rdev), &statbuf->st_rdev);
err |= __put_user(stat->size, &statbuf->st_size);
err |= __put_user(stat->atime.tv_sec, &statbuf->st_atime);
err |= __put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
err |= __put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
err |= __put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
err |= __put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
err |= __put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
err |= __put_user(stat->blksize, &statbuf->st_blksize);
err |= __put_user(stat->blocks, &statbuf->st_blocks);
err |= __put_user(0, &statbuf->__unused4[0]);
err |= __put_user(0, &statbuf->__unused4[1]);

return err;
}

/* Note: it is necessary to treat option as an unsigned int,
* with the corresponding cast to a signed int to insure that the
* proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
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35 changes: 0 additions & 35 deletions arch/s390/kernel/compat_linux.c
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Original file line number Diff line number Diff line change
Expand Up @@ -362,41 +362,6 @@ asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned
return sys_ftruncate(fd, (high << 32) | low);
}

int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
{
compat_ino_t ino;
int err;

if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
return -EOVERFLOW;

ino = stat->ino;
if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
return -EOVERFLOW;

err = put_user(old_encode_dev(stat->dev), &statbuf->st_dev);
err |= put_user(stat->ino, &statbuf->st_ino);
err |= put_user(stat->mode, &statbuf->st_mode);
err |= put_user(stat->nlink, &statbuf->st_nlink);
err |= put_user(high2lowuid(stat->uid), &statbuf->st_uid);
err |= put_user(high2lowgid(stat->gid), &statbuf->st_gid);
err |= put_user(old_encode_dev(stat->rdev), &statbuf->st_rdev);
err |= put_user(stat->size, &statbuf->st_size);
err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
err |= put_user(stat->blksize, &statbuf->st_blksize);
err |= put_user(stat->blocks, &statbuf->st_blocks);
/* fixme
err |= put_user(0, &statbuf->__unused4[0]);
err |= put_user(0, &statbuf->__unused4[1]);
*/
return err;
}

asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
struct compat_timespec __user *interval)
{
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35 changes: 0 additions & 35 deletions arch/sparc64/kernel/sys_sparc32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -148,41 +148,6 @@ asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned
return sys_ftruncate(fd, (high << 32) | low);
}

int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
{
compat_ino_t ino;
int err;

if (stat->size > MAX_NON_LFS || !old_valid_dev(stat->dev) ||
!old_valid_dev(stat->rdev))
return -EOVERFLOW;

ino = stat->ino;
if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
return -EOVERFLOW;

err = put_user(old_encode_dev(stat->dev), &statbuf->st_dev);
err |= put_user(stat->ino, &statbuf->st_ino);
err |= put_user(stat->mode, &statbuf->st_mode);
err |= put_user(stat->nlink, &statbuf->st_nlink);
err |= put_user(high2lowuid(stat->uid), &statbuf->st_uid);
err |= put_user(high2lowgid(stat->gid), &statbuf->st_gid);
err |= put_user(old_encode_dev(stat->rdev), &statbuf->st_rdev);
err |= put_user(stat->size, &statbuf->st_size);
err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
err |= put_user(stat->blksize, &statbuf->st_blksize);
err |= put_user(stat->blocks, &statbuf->st_blocks);
err |= put_user(0, &statbuf->__unused4[0]);
err |= put_user(0, &statbuf->__unused4[1]);

return err;
}

static int cp_compat_stat64(struct kstat *stat,
struct compat_stat64 __user *statbuf)
{
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35 changes: 0 additions & 35 deletions arch/x86/ia32/sys_ia32.c
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Original file line number Diff line number Diff line change
Expand Up @@ -49,41 +49,6 @@

#define AA(__x) ((unsigned long)(__x))

int cp_compat_stat(struct kstat *kbuf, struct compat_stat __user *ubuf)
{
compat_ino_t ino;

typeof(ubuf->st_uid) uid = 0;
typeof(ubuf->st_gid) gid = 0;
SET_UID(uid, kbuf->uid);
SET_GID(gid, kbuf->gid);
if (!old_valid_dev(kbuf->dev) || !old_valid_dev(kbuf->rdev))
return -EOVERFLOW;
if (kbuf->size >= 0x7fffffff)
return -EOVERFLOW;
ino = kbuf->ino;
if (sizeof(ino) < sizeof(kbuf->ino) && ino != kbuf->ino)
return -EOVERFLOW;
if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct compat_stat)) ||
__put_user(old_encode_dev(kbuf->dev), &ubuf->st_dev) ||
__put_user(ino, &ubuf->st_ino) ||
__put_user(kbuf->mode, &ubuf->st_mode) ||
__put_user(kbuf->nlink, &ubuf->st_nlink) ||
__put_user(uid, &ubuf->st_uid) ||
__put_user(gid, &ubuf->st_gid) ||
__put_user(old_encode_dev(kbuf->rdev), &ubuf->st_rdev) ||
__put_user(kbuf->size, &ubuf->st_size) ||
__put_user(kbuf->atime.tv_sec, &ubuf->st_atime) ||
__put_user(kbuf->atime.tv_nsec, &ubuf->st_atime_nsec) ||
__put_user(kbuf->mtime.tv_sec, &ubuf->st_mtime) ||
__put_user(kbuf->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
__put_user(kbuf->ctime.tv_sec, &ubuf->st_ctime) ||
__put_user(kbuf->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
__put_user(kbuf->blksize, &ubuf->st_blksize) ||
__put_user(kbuf->blocks, &ubuf->st_blocks))
return -EFAULT;
return 0;
}

asmlinkage long sys32_truncate64(char __user *filename,
unsigned long offset_low,
Expand Down
39 changes: 39 additions & 0 deletions fs/compat.c
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Original file line number Diff line number Diff line change
Expand Up @@ -137,6 +137,45 @@ asmlinkage long compat_sys_utimes(char __user *filename, struct compat_timeval _
return compat_sys_futimesat(AT_FDCWD, filename, t);
}

static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
{
compat_ino_t ino = stat->ino;
typeof(ubuf->st_uid) uid = 0;
typeof(ubuf->st_gid) gid = 0;
int err;

SET_UID(uid, stat->uid);
SET_GID(gid, stat->gid);

if ((u64) stat->size > MAX_NON_LFS ||
!old_valid_dev(stat->dev) ||
!old_valid_dev(stat->rdev))
return -EOVERFLOW;
if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
return -EOVERFLOW;

if (clear_user(ubuf, sizeof(*ubuf)))
return -EFAULT;

err = __put_user(old_encode_dev(stat->dev), &ubuf->st_dev);
err |= __put_user(ino, &ubuf->st_ino);
err |= __put_user(stat->mode, &ubuf->st_mode);
err |= __put_user(stat->nlink, &ubuf->st_nlink);
err |= __put_user(uid, &ubuf->st_uid);
err |= __put_user(gid, &ubuf->st_gid);
err |= __put_user(old_encode_dev(stat->rdev), &ubuf->st_rdev);
err |= __put_user(stat->size, &ubuf->st_size);
err |= __put_user(stat->atime.tv_sec, &ubuf->st_atime);
err |= __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec);
err |= __put_user(stat->mtime.tv_sec, &ubuf->st_mtime);
err |= __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec);
err |= __put_user(stat->ctime.tv_sec, &ubuf->st_ctime);
err |= __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec);
err |= __put_user(stat->blksize, &ubuf->st_blksize);
err |= __put_user(stat->blocks, &ubuf->st_blocks);
return err;
}

asmlinkage long compat_sys_newstat(char __user * filename,
struct compat_stat __user *statbuf)
{
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1 change: 0 additions & 1 deletion include/linux/compat.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,6 @@ typedef struct {
compat_sigset_word sig[_COMPAT_NSIG_WORDS];
} compat_sigset_t;

extern int cp_compat_stat(struct kstat *, struct compat_stat __user *);
extern int get_compat_timespec(struct timespec *, const struct compat_timespec __user *);
extern int put_compat_timespec(const struct timespec *, struct compat_timespec __user *);

Expand Down

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