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Viewing changes to kernel/sysctl_binary.c

  • Committer: Bazaar Package Importer
  • Author(s): Paolo Pisati
  • Date: 2011-06-29 15:23:51 UTC
  • mfrom: (26.1.1 natty-proposed)
  • Revision ID: james.westby@ubuntu.com-20110629152351-xs96tm303d95rpbk
Tags: 3.0.0-1200.2
* Rebased against 3.0.0-6.7
* BSP from TI based on 3.0.0

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Lines of Context:
kernel/sysctl_binary.c
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        void __user *oldval, size_t oldlen, void __user *newval, size_t newlen)
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{
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        const struct bin_table *table = NULL;
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        struct nameidata nd;
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        struct vfsmount *mnt;
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        struct file *file;
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        ssize_t result;
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        char *pathname;
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        int flags;
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        int acc_mode;
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        pathname = sysctl_getname(name, nlen, &table);
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        result = PTR_ERR(pathname);
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        /* How should the sysctl be accessed? */
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        if (oldval && oldlen && newval && newlen) {
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                flags = O_RDWR;
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                acc_mode = MAY_READ | MAY_WRITE;
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        } else if (newval && newlen) {
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                flags = O_WRONLY;
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                acc_mode = MAY_WRITE;
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        } else if (oldval && oldlen) {
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                flags = O_RDONLY;
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                acc_mode = MAY_READ;
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        } else {
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                result = 0;
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                goto out_putname;
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        }
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        mnt = current->nsproxy->pid_ns->proc_mnt;
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        result = vfs_path_lookup(mnt->mnt_root, mnt, pathname, 0, &nd);
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        if (result)
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                goto out_putname;
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        result = may_open(&nd.path, acc_mode, flags);
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        if (result)
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                goto out_putpath;
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        file = dentry_open(nd.path.dentry, nd.path.mnt, flags, current_cred());
 
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        file = file_open_root(mnt->mnt_root, mnt, pathname, flags);
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        result = PTR_ERR(file);
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        if (IS_ERR(file))
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                goto out_putname;
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        putname(pathname);
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out:
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        return result;
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out_putpath:
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        path_put(&nd.path);
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        goto out_putname;
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}
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