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tree-wide: remove support for kernels lacking ambient caps

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Let's bump the kernel baseline a bit to 4.3 and thus require ambient
caps.

This allows us to remove support for a variety of special casing, most
importantly the ExecStart=!! hack.
This commit is contained in:
Lennart Poettering
2024-12-17 17:34:46 +01:00
parent 96ec3911f3
commit 00a415fc8f
18 changed files with 70 additions and 134 deletions
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src/basic/capability-util.c
+2 -35
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@@ -123,12 +123,6 @@ int capability_ambient_set_apply(uint64_t set, bool also_inherit) {
/* Add the capabilities to the ambient set (an possibly also the inheritable set) */
/* Check that we can use PR_CAP_AMBIENT or quit early. */
if (!ambient_capabilities_supported())
return (set & all_capabilities()) == 0 ?
0 : -EOPNOTSUPP; /* if actually no ambient caps are to be set, be silent,
* otherwise fail recognizably */
if (also_inherit) {
caps = cap_get_proc();
if (!caps)
@@ -395,32 +389,12 @@ int keep_capability(cap_value_t cv) {
return change_capability(cv, CAP_SET);
}
bool ambient_capabilities_supported(void) {
static int cache = -1;
if (cache >= 0)
return cache;
/* If PR_CAP_AMBIENT returns something valid, or an unexpected error code we assume that ambient caps are
* available. */
cache = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, CAP_KILL, 0, 0) >= 0 ||
!IN_SET(errno, EINVAL, EOPNOTSUPP, ENOSYS);
return cache;
}
bool capability_quintet_mangle(CapabilityQuintet *q) {
uint64_t combined, drop = 0;
bool ambient_supported;
assert(q);
combined = q->effective | q->bounding | q->inheritable | q->permitted;
ambient_supported = q->ambient != CAP_MASK_UNSET;
if (ambient_supported)
combined |= q->ambient;
combined = q->effective | q->bounding | q->inheritable | q->permitted | q->ambient;
for (unsigned i = 0; i <= cap_last_cap(); i++) {
unsigned long bit = UINT64_C(1) << i;
@@ -439,9 +413,7 @@ bool capability_quintet_mangle(CapabilityQuintet *q) {
q->bounding &= ~drop;
q->inheritable &= ~drop;
q->permitted &= ~drop;
if (ambient_supported)
q->ambient &= ~drop;
q->ambient &= ~drop;
return drop != 0; /* Let the caller know we changed something */
}
@@ -623,11 +595,6 @@ int capability_get_ambient(uint64_t *ret) {
assert(ret);
if (!ambient_capabilities_supported()) {
*ret = 0;
return 0;
}
for (unsigned i = 0; i <= cap_last_cap(); i++) {
r = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, i, 0, 0);
if (r < 0)