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// SPDX-License-Identifier: GPL-2.0
#include "cap_helpers.h"
/* Avoid including <sys/capability.h> from the libcap-devel package,
* so directly declare them here and use them from glibc.
*/
int capget(cap_user_header_t header, cap_user_data_t data);
int capset(cap_user_header_t header, const cap_user_data_t data);
int cap_enable_effective(__u64 caps, __u64 *old_caps)
{
struct __user_cap_data_struct data[_LINUX_CAPABILITY_U32S_3];
struct __user_cap_header_struct hdr = {
.version = _LINUX_CAPABILITY_VERSION_3,
};
__u32 cap0 = caps;
__u32 cap1 = caps >> 32;
int err;
err = capget(&hdr, data);
if (err)
return err;
if (old_caps)
*old_caps = (__u64)(data[1].effective) << 32 | data[0].effective;
if ((data[0].effective & cap0) == cap0 &&
(data[1].effective & cap1) == cap1)
return 0;
data[0].effective |= cap0;
data[1].effective |= cap1;
err = capset(&hdr, data);
if (err)
return err;
return 0;
}
int cap_disable_effective(__u64 caps, __u64 *old_caps)
{
struct __user_cap_data_struct data[_LINUX_CAPABILITY_U32S_3];
struct __user_cap_header_struct hdr = {
.version = _LINUX_CAPABILITY_VERSION_3,
};
__u32 cap0 = caps;
__u32 cap1 = caps >> 32;
int err;
err = capget(&hdr, data);
if (err)
return err;
if (old_caps)
*old_caps = (__u64)(data[1].effective) << 32 | data[0].effective;
if (!(data[0].effective & cap0) && !(data[1].effective & cap1))
return 0;
data[0].effective &= ~cap0;
data[1].effective &= ~cap1;
err = capset(&hdr, data);
if (err)
return err;
return 0;
}
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