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Fix some POSIX-compliance bugs in link, rename, mkdir.

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* syscalls.cc (link): Delete obsolete comment.  Reject directories
and missing source up front.
(rename): Use correct errno for trailing '.'.  Detect empty
strings.  Allow trailing slash to newpath iff oldpath is
directory.
* dir.cc (mkdir): Reject dangling symlink with trailing slash.
* fhandler_disk_file.cc (fhandler_disk_file::link): Reject
trailing slash.
* fhandler.cc (fhandler_base::link): Match Linux errno.
This commit is contained in:
Eric Blake 2009-09-26 15:51:53 +00:00
parent 1e6459d3e5
commit 52dba6a5c4
5 changed files with 109 additions and 42 deletions
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12
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,15 @@
2009-09-26 Eric Blake <ebb9@byu.net>
* syscalls.cc (link): Delete obsolete comment. Reject directories
and missing source up front.
(rename): Use correct errno for trailing '.'. Detect empty
strings. Allow trailing slash to newpath iff oldpath is
directory.
* dir.cc (mkdir): Reject dangling symlink with trailing slash.
* fhandler_disk_file.cc (fhandler_disk_file::link): Reject
trailing slash.
* fhandler.cc (fhandler_base::link): Match Linux errno.
2009-09-25 Eric Blake <ebb9@byu.net>
* syscalls.cc (fchmodat): lchmod is not yet implemented.

23
winsup/cygwin/dir.cc
View File

@ -1,6 +1,7 @@
/* dir.cc: Posix directory-related routines
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2006, 2007 Red Hat, Inc.
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2006, 2007,
2008, 2009 Red Hat, Inc.
This file is part of Cygwin.
@ -21,6 +22,7 @@ details. */
#include "dtable.h"
#include "cygheap.h"
#include "cygtls.h"
#include "tls_pbuf.h"
extern "C" int
dirfd (DIR *dir)
@ -273,11 +275,30 @@ mkdir (const char *dir, mode_t mode)
{
int res = -1;
fhandler_base *fh = NULL;
tmp_pathbuf tp;
myfault efault;
if (efault.faulted (EFAULT))
return -1;
/* POSIX says mkdir("symlink-to-missing/") should create the
directory "missing", but Linux rejects it with EEXIST. Copy
Linux behavior for now. */
if (!*dir)
{
set_errno (ENOENT);
goto done;
}
if (isdirsep (dir[strlen (dir) - 1]))
{
/* This converts // to /, but since both give EEXIST, we're okay. */
char *buf;
char *p = stpcpy (buf = tp.c_get (), dir) - 1;
dir = buf;
while (p > dir && isdirsep (*p))
*p-- = '\0';
}
if (!(fh = build_fh_name (dir, NULL, PC_SYM_NOFOLLOW)))
goto done; /* errno already set */;

2
winsup/cygwin/fhandler.cc
View File

@ -1541,7 +1541,7 @@ fhandler_base::ftruncate (_off64_t length, bool allow_truncate)
int
fhandler_base::link (const char *newpath)
{
set_errno (EINVAL);
set_errno (EPERM);
return -1;
}

11
winsup/cygwin/fhandler_disk_file.cc
View File

@ -1186,7 +1186,8 @@ fhandler_disk_file::ftruncate (_off64_t length, bool allow_truncate)
int
fhandler_disk_file::link (const char *newpath)
{
path_conv newpc (newpath, PC_SYM_NOFOLLOW | PC_POSIX, stat_suffixes);
size_t nlen = strlen (newpath);
path_conv newpc (newpath, PC_SYM_NOFOLLOW | PC_POSIX | PC_NULLEMPTY, stat_suffixes);
if (newpc.error)
{
set_errno (newpc.error);
@ -1200,7 +1201,13 @@ fhandler_disk_file::link (const char *newpath)
return -1;
}
char new_buf[strlen (newpath) + 5];
if (isdirsep (newpath[nlen - 1]) || has_dot_last_component (newpath, false))
{
set_errno (ENOENT);
return -1;
}
char new_buf[nlen + 5];
if (!newpc.error)
{
if (pc.is_lnk_special ())

103
winsup/cygwin/syscalls.cc
View File

@ -1124,13 +1124,6 @@ isatty (int fd)
}
EXPORT_ALIAS (isatty, _isatty)
/* Under NT, try to make a hard link using backup API. If that
fails or we are Win 95, just copy the file.
FIXME: We should actually be checking partition type, not OS.
Under NTFS, we should support hard links. On FAT partitions,
we should just copy the file.
*/
extern "C" int
link (const char *oldpath, const char *newpath)
{
@ -1145,6 +1138,10 @@ link (const char *oldpath, const char *newpath)
debug_printf ("got %d error from build_fh_name", fh->error ());
set_errno (fh->error ());
}
else if (fh->pc.isdir ())
set_errno (EPERM); /* We do not permit linking directories. */
else if (!fh->pc.exists ())
set_errno (ENOENT);
else
res = fh->link (newpath);
@ -1651,7 +1648,6 @@ rename (const char *oldpath, const char *newpath)
{
tmp_pathbuf tp;
int res = -1;
char *oldbuf, *newbuf;
path_conv oldpc, newpc, new2pc, *dstpc, *removepc = NULL;
bool old_dir_requested = false, new_dir_requested = false;
bool old_explicit_suffix = false, new_explicit_suffix = false;
@ -1670,16 +1666,21 @@ rename (const char *oldpath, const char *newpath)
if (efault.faulted (EFAULT))
return -1;
if (!*oldpath || !*newpath)
{
set_errno (ENOENT);
goto out;
}
if (has_dot_last_component (oldpath, true))
{
oldpc.check (oldpath, PC_SYM_NOFOLLOW, stat_suffixes);
set_errno (oldpc.isdir () ? EBUSY : ENOTDIR);
set_errno (oldpc.isdir () ? EINVAL : ENOTDIR);
goto out;
}
if (has_dot_last_component (newpath, true))
{
newpc.check (newpath, PC_SYM_NOFOLLOW, stat_suffixes);
set_errno (!newpc.exists () ? ENOENT : newpc.isdir () ? EBUSY : ENOTDIR);
set_errno (!newpc.exists () ? ENOENT : newpc.isdir () ? EINVAL : ENOTDIR);
goto out;
}
@ -1689,10 +1690,20 @@ rename (const char *oldpath, const char *newpath)
olen = strlen (oldpath);
if (isdirsep (oldpath[olen - 1]))
{
stpcpy (oldbuf = tp.c_get (), oldpath);
while (olen > 0 && isdirsep (oldbuf[olen - 1]))
oldbuf[--olen] = '\0';
oldpath = oldbuf;
char *buf;
char *p = stpcpy (buf = tp.c_get (), oldpath) - 1;
oldpath = buf;
while (p >= oldpath && isdirsep (*p))
*p-- = '\0';
olen = p + 1 - oldpath;
if (!olen)
{
/* The root directory cannot be renamed. This also rejects
the corner case of rename("/","/"), even though it is the
same file. */
set_errno (EINVAL);
goto out;
}
old_dir_requested = true;
}
oldpc.check (oldpath, PC_SYM_NOFOLLOW, stat_suffixes);
@ -1724,10 +1735,17 @@ rename (const char *oldpath, const char *newpath)
nlen = strlen (newpath);
if (isdirsep (newpath[nlen - 1]))
{
stpcpy (newbuf = tp.c_get (), newpath);
while (nlen > 0 && isdirsep (newbuf[nlen - 1]))
newbuf[--nlen] = '\0';
newpath = newbuf;
char *buf;
char *p = stpcpy (buf = tp.c_get (), newpath) - 1;
newpath = buf;
while (p >= newpath && isdirsep (*p))
*p-- = '\0';
nlen = p + 1 - newpath;
if (!nlen) /* The root directory is never empty. */
{
set_errno (ENOTEMPTY);
goto out;
}
new_dir_requested = true;
}
newpc.check (newpath, PC_SYM_NOFOLLOW, stat_suffixes);
@ -1741,9 +1759,22 @@ rename (const char *oldpath, const char *newpath)
set_errno (EROFS);
goto out;
}
if (new_dir_requested && !newpc.isdir ())
if (new_dir_requested)
{
set_errno (ENOTDIR);
if (!newpc.exists())
{
set_errno (ENOENT);
goto out;
}
if (!newpc.isdir ())
{
set_errno (ENOTDIR);
goto out;
}
}
if (newpc.exists () && (oldpc.isdir () ? !newpc.isdir () : newpc.isdir ()))
{
set_errno (newpc.isdir () ? EISDIR : ENOTDIR);
goto out;
}
if (newpc.known_suffix
@ -1774,22 +1805,23 @@ rename (const char *oldpath, const char *newpath)
}
else if (oldpc.isdir ())
{
if (newpc.exists () && !newpc.isdir ())
{
set_errno (ENOTDIR);
goto out;
}
/* Check for newpath being a subdir of oldpath. */
/* Check for newpath being identical or a subdir of oldpath. */
if (RtlPrefixUnicodeString (oldpc.get_nt_native_path (),
newpc.get_nt_native_path (),
TRUE)
&& newpc.get_nt_native_path ()->Length >
oldpc.get_nt_native_path ()->Length
&& *(PWCHAR) ((PBYTE) newpc.get_nt_native_path ()->Buffer
+ oldpc.get_nt_native_path ()->Length) == L'\\')
TRUE))
{
set_errno (EINVAL);
goto out;
if (newpc.get_nt_native_path ()->Length
== oldpc.get_nt_native_path ()->Length)
{
res = 0;
goto out;
}
if (*(PWCHAR) ((PBYTE) newpc.get_nt_native_path ()->Buffer
+ oldpc.get_nt_native_path ()->Length) == L'\\')
{
set_errno (EINVAL);
goto out;
}
}
}
else if (!newpc.exists ())
@ -1816,11 +1848,6 @@ rename (const char *oldpath, const char *newpath)
.exe suffix must be given explicitly in oldpath. */
rename_append_suffix (newpc, newpath, nlen, ".exe");
}
else if (newpc.isdir ())
{
set_errno (EISDIR);
goto out;
}
else
{
if (equal_path && old_explicit_suffix != new_explicit_suffix)