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| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2009-10-04 21:49:47 +0900 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-10-12 10:56:00 +1100 |
| commit | 89eda06837094ce9f34fae269b8773fcfd70f046 (patch) | |
| tree | dc11701c68ebcc8346d7567cfb53b9c7327ef445 /fs/open.c | |
| parent | 941fc5b2bf8f7dd1d0a9c502e152fa719ff6578e (diff) | |
| download | lwn-89eda06837094ce9f34fae269b8773fcfd70f046.tar.gz lwn-89eda06837094ce9f34fae269b8773fcfd70f046.zip | |
LSM: Add security_path_chmod() and security_path_chown().
This patch allows pathname based LSM modules to check chmod()/chown()
operations. Since notify_change() does not receive "struct vfsmount *",
we add security_path_chmod() and security_path_chown() to the caller of
notify_change().
These hooks are used by TOMOYO.
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'fs/open.c')
| -rw-r--r-- | fs/open.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/fs/open.c b/fs/open.c index 4f01e06227c6..b5c294d35bd1 100644 --- a/fs/open.c +++ b/fs/open.c @@ -616,6 +616,9 @@ SYSCALL_DEFINE2(fchmod, unsigned int, fd, mode_t, mode) err = mnt_want_write_file(file); if (err) goto out_putf; + err = security_path_chmod(dentry, file->f_vfsmnt, mode); + if (err) + goto out_drop_write; mutex_lock(&inode->i_mutex); if (mode == (mode_t) -1) mode = inode->i_mode; @@ -623,6 +626,7 @@ SYSCALL_DEFINE2(fchmod, unsigned int, fd, mode_t, mode) newattrs.ia_valid = ATTR_MODE | ATTR_CTIME; err = notify_change(dentry, &newattrs); mutex_unlock(&inode->i_mutex); +out_drop_write: mnt_drop_write(file->f_path.mnt); out_putf: fput(file); @@ -645,6 +649,9 @@ SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, mode_t, mode) error = mnt_want_write(path.mnt); if (error) goto dput_and_out; + error = security_path_chmod(path.dentry, path.mnt, mode); + if (error) + goto out_drop_write; mutex_lock(&inode->i_mutex); if (mode == (mode_t) -1) mode = inode->i_mode; @@ -652,6 +659,7 @@ SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, mode_t, mode) newattrs.ia_valid = ATTR_MODE | ATTR_CTIME; error = notify_change(path.dentry, &newattrs); mutex_unlock(&inode->i_mutex); +out_drop_write: mnt_drop_write(path.mnt); dput_and_out: path_put(&path); @@ -700,7 +708,9 @@ SYSCALL_DEFINE3(chown, const char __user *, filename, uid_t, user, gid_t, group) error = mnt_want_write(path.mnt); if (error) goto out_release; - error = chown_common(path.dentry, user, group); + error = security_path_chown(&path, user, group); + if (!error) + error = chown_common(path.dentry, user, group); mnt_drop_write(path.mnt); out_release: path_put(&path); @@ -725,7 +735,9 @@ SYSCALL_DEFINE5(fchownat, int, dfd, const char __user *, filename, uid_t, user, error = mnt_want_write(path.mnt); if (error) goto out_release; - error = chown_common(path.dentry, user, group); + error = security_path_chown(&path, user, group); + if (!error) + error = chown_common(path.dentry, user, group); mnt_drop_write(path.mnt); out_release: path_put(&path); @@ -744,7 +756,9 @@ SYSCALL_DEFINE3(lchown, const char __user *, filename, uid_t, user, gid_t, group error = mnt_want_write(path.mnt); if (error) goto out_release; - error = chown_common(path.dentry, user, group); + error = security_path_chown(&path, user, group); + if (!error) + error = chown_common(path.dentry, user, group); mnt_drop_write(path.mnt); out_release: path_put(&path); @@ -767,7 +781,9 @@ SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group) goto out_fput; dentry = file->f_path.dentry; audit_inode(NULL, dentry); - error = chown_common(dentry, user, group); + error = security_path_chown(&file->f_path, user, group); + if (!error) + error = chown_common(dentry, user, group); mnt_drop_write(file->f_path.mnt); out_fput: fput(file); |