return log_oom();
if (keep_capabilities) {
- cap_value_t bits[sizeof(keep_capabilities)*8];
+ cap_value_t bits[u64log2(keep_capabilities) + 1];
- for (i = 0; i < sizeof(keep_capabilities)*8; i++)
+ for (i = 0; i < ELEMENTSOF(bits); i++)
if (keep_capabilities & (1ULL << i))
bits[j++] = i;
+ /* don't keep too many bits */
+ assert((keep_capabilities & (~1ULL << i)) == 0);
+ /* don't throw away too many bits */
+ assert(((keep_capabilities >> i) & (~1ULL >> i)) == 0);
+
if (cap_set_flag(d, CAP_EFFECTIVE, j, bits, CAP_SET) < 0 ||
cap_set_flag(d, CAP_PERMITTED, j, bits, CAP_SET) < 0) {
log_error_errno(errno, "Failed to enable capabilities bits: %m");