lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Fri, 22 Feb 2008 10:49:32 +0900 From: Kohei KaiGai <kaigai@...jp.nec.com> To: greg@...ah.com, morgan@...nel.org, serue@...ibm.com CC: linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH 3/3] exporting capability name/code pairs (final) [3/3] A new example to use kobject/kobj_attribute The attached patch can provide a new exmple to use kobject and attribute. The _show() and _store() method can refer/store the private data field of kobj_attribute structure to know what entries are accessed by users. It will make easier to share a single _show()/_store() method with several entries. KaiGai Kohei <kaigai@...jp.nec.com> -- samples/kobject/kobject-example.c | 32 ++++++++++++++++++++++++++++++++ 1 files changed, 32 insertions(+), 0 deletions(-) diff --git a/samples/kobject/kobject-example.c b/samples/kobject/kobject-example.c index 08d0d3f..f99d734 100644 --- a/samples/kobject/kobject-example.c +++ b/samples/kobject/kobject-example.c @@ -77,6 +77,35 @@ static struct kobj_attribute baz_attribute = static struct kobj_attribute bar_attribute = __ATTR(bar, 0666, b_show, b_store); +/* + * You can store a private data within 'data' field of kobj_attribute. + * It enables to share a single _show() or _store() method with several + * entries. + */ +static ssize_t integer_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return scnprintf(buf, PAGE_SIZE, "%d\n", (int) attr->data); +} + +static ssize_t integer_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + int code; + + sscanf(buf, "%du", &code); + attr->data = (void *) code; + return count; +} + +static struct kobj_attribute hoge_attribute = + __ATTR_DATA(hoge, 0666, integer_show, integer_store, 123); +static struct kobj_attribute piyo_attribute = + __ATTR_DATA(piyo, 0666, integer_show, integer_store, 456); +static struct kobj_attribute fuga_attribute = + __ATTR_DATA(fuga, 0444, integer_show, NULL, 789); /* * Create a group of attributes so that we can create and destory them all @@ -86,6 +115,9 @@ static struct attribute *attrs[] = { &foo_attribute.attr, &baz_attribute.attr, &bar_attribute.attr, + &hoge_attribute.attr, + &piyo_attribute.attr, + &fuga_attribute.attr, NULL, /* need to NULL terminate the list of attributes */ }; -- OSS Platform Development Division, NEC KaiGai Kohei <kaigai@...jp.nec.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists