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Fix VFS file creation bugs (rhbz 844485)

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This commit is contained in:
Josh Boyer 2012-08-13 14:58:51 -04:00
parent 0f5d14cc69
commit 83eda0f218
2 changed files with 403 additions and 1 deletions
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11
kernel.spec
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@ -62,7 +62,7 @@ Summary: The Linux kernel
# For non-released -rc kernels, this will be appended after the rcX and # For non-released -rc kernels, this will be appended after the rcX and
# gitX tags, so a 3 here would become part of release "0.rcX.gitX.3" # gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
# #
%global baserelease 1 %global baserelease 2
%global fedora_build %{baserelease} %global fedora_build %{baserelease}
# base_sublevel is the kernel version we're starting with and patching # base_sublevel is the kernel version we're starting with and patching
@ -746,6 +746,9 @@ Patch22001: selinux-apply-different-permission-to-ptrace-child.patch
#rhbz 836742 #rhbz 836742
Patch22059: uvcvideo-Reset-bytesused-field-when-recycling-erroneous-buffer.patch Patch22059: uvcvideo-Reset-bytesused-field-when-recycling-erroneous-buffer.patch
#rhbz 844485
Patch22060: vfs-fix-file-creation-bugs.patch
# END OF PATCH DEFINITIONS # END OF PATCH DEFINITIONS
%endif %endif
@ -1436,6 +1439,9 @@ ApplyPatch selinux-apply-different-permission-to-ptrace-child.patch
#rhbz 836742 #rhbz 836742
ApplyPatch uvcvideo-Reset-bytesused-field-when-recycling-erroneous-buffer.patch ApplyPatch uvcvideo-Reset-bytesused-field-when-recycling-erroneous-buffer.patch
#rhbz 844485
ApplyPatch vfs-fix-file-creation-bugs.patch
# END OF PATCH APPLICATIONS # END OF PATCH APPLICATIONS
%endif %endif
@ -2293,6 +2299,9 @@ fi
# ||----w | # ||----w |
# || || # || ||
%changelog %changelog
* Mon Aug 13 2012 Josh Boyer <jwboyer@redhat.com> - 3.6.0-0.rc1.git5.2
- Fix VFS file creation bugs (rhbz 844485)
* Mon Aug 13 2012 Josh Boyer <jwboyer@redhat.com> - 3.6.0-0.rc1.git5.1 * Mon Aug 13 2012 Josh Boyer <jwboyer@redhat.com> - 3.6.0-0.rc1.git5.1
- Linux v3.6-rc1-312-g3bf671a - Linux v3.6-rc1-312-g3bf671a

393
vfs-fix-file-creation-bugs.patch Normal file
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@ -0,0 +1,393 @@
Path: news.gmane.org!not-for-mail
From: Miklos Szeredi <miklos@szeredi.hu>
Newsgroups: gmane.linux.kernel,gmane.linux.file-systems,gmane.linux.kernel.stable
Subject: [PATCH 1/4] vfs: canonicalize create mode in build_open_flags()
Date: Tue, 7 Aug 2012 14:45:46 +0200
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Approved: news@gmane.org
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From: Miklos Szeredi <mszeredi@suse.cz>
Userspace can pass weird create mode in open(2) that we canonicalize to
"(mode & S_IALLUGO) | S_IFREG" in vfs_create().
The problem is that we use the uncanonicalized mode before calling vfs_create()
with unforseen consequences.
So do the canonicalization early in build_open_flags().
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
CC: stable@vger.kernel.org
---
fs/open.c | 7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/fs/open.c b/fs/open.c
index bc132e1..e1f2cdb 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -852,9 +852,10 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
int lookup_flags = 0;
int acc_mode;
- if (!(flags & O_CREAT))
- mode = 0;
- op->mode = mode;
+ if (flags & O_CREAT)
+ op->mode = (mode & S_IALLUGO) | S_IFREG;
+ else
+ op->mode = 0;
/* Must never be set by userspace */
flags &= ~FMODE_NONOTIFY;
--
1.7.7
Path: news.gmane.org!not-for-mail
From: Miklos Szeredi <miklos@szeredi.hu>
Newsgroups: gmane.linux.kernel,gmane.linux.file-systems
Subject: [PATCH 2/4] vfs: atomic_open(): fix create mode usage
Date: Tue, 7 Aug 2012 14:45:47 +0200
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From: Miklos Szeredi <mszeredi@suse.cz>
Don't mask S_ISREG off the create mode before passing to ->atomic_open(). Other
methods (->create, ->mknod) also get the complete file mode and filesystems
expect it.
Reported-by: Steve <steveamigauk@yahoo.co.uk>
Reported-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---
fs/namei.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 1b46439..5bac1bb 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2414,7 +2414,7 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
goto out;
}
- mode = op->mode & S_IALLUGO;
+ mode = op->mode;
if ((open_flag & O_CREAT) && !IS_POSIXACL(dir))
mode &= ~current_umask();
--
1.7.7
Path: news.gmane.org!not-for-mail
From: Miklos Szeredi <miklos@szeredi.hu>
Newsgroups: gmane.linux.kernel,gmane.linux.file-systems
Subject: [PATCH 3/4] vfs: pass right create mode to may_o_create()
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From: Miklos Szeredi <mszeredi@suse.cz>
Pass the umask-ed create mode to may_o_create() instead of the original one.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---
fs/namei.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/namei.c b/fs/namei.c
index 5bac1bb..26c28ec 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2452,7 +2452,7 @@ static int atomic_open(struct nameidata *nd, struct dentry *dentry,
}
if (open_flag & O_CREAT) {
- error = may_o_create(&nd->path, dentry, op->mode);
+ error = may_o_create(&nd->path, dentry, mode);
if (error) {
create_error = error;
if (open_flag & O_EXCL)
--
1.7.7
Path: news.gmane.org!not-for-mail
From: Miklos Szeredi <miklos@szeredi.hu>
Newsgroups: gmane.linux.kernel,gmane.linux.file-systems
Subject: [PATCH 4/4] fuse: check create mode in atomic open
Date: Tue, 7 Aug 2012 14:45:49 +0200
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Xref: news.gmane.org gmane.linux.kernel:1338998 gmane.linux.file-systems:66447
Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1338998>
From: Miklos Szeredi <mszeredi@suse.cz>
Verify that the VFS is passing us a complete create mode with the S_IFREG to
atomic open.
Reported-by: Steve <steveamigauk@yahoo.co.uk>
Reported-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---
fs/fuse/dir.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 8964cf3..324bc08 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -383,6 +383,9 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
struct fuse_entry_out outentry;
struct fuse_file *ff;
+ /* Userspace expects S_IFREG in create mode */
+ BUG_ON((mode & S_IFMT) != S_IFREG);
+
forget = fuse_alloc_forget();
err = -ENOMEM;
if (!forget)
--
1.7.7