// 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 -errno; 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 -errno; 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 -errno; 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 -errno; return 0; }