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Subject[RFC PATCH v1 2/2] kernel/ksysfs.c: Add capabilities attribute.
Date
This new read-only attribute prints the capabilities values with their names:
0 CAP_CHOWN
1 CAP_DAC_OVERRIDE
...
39 CAP_BPF

Signed-off-by: Francis Laniel <flaniel@linux.microsoft.com>
---
kernel/ksysfs.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 35859da8bd4f..7d39794a55bc 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -182,6 +182,23 @@ static ssize_t rcu_normal_store(struct kobject *kobj,
KERNEL_ATTR_RW(rcu_normal);
#endif /* #ifndef CONFIG_TINY_RCU */

+static ssize_t capabilities_show(struct kobject *unused0,
+ struct kobj_attribute *unused1, char *buf)
+{
+ int at = 0;
+ int i;
+
+ for (i = 0; i < CAP_LAST_CAP; i++) {
+ if (at >= PAGE_SIZE)
+ return at;
+
+ at += sysfs_emit_at(buf, at, "%d\t%s\n", i, cap_strings[i]);
+ }
+
+ return at;
+}
+KERNEL_ATTR_RO(capabilities);
+
/*
* Make /sys/kernel/notes give the raw contents of our kernel .notes section.
*/
@@ -229,6 +246,7 @@ static struct attribute * kernel_attrs[] = {
&rcu_expedited_attr.attr,
&rcu_normal_attr.attr,
#endif
+ &capabilities_attr.attr,
NULL
};

--
2.30.2
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