X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Fcapability.c;h=58f00e6daec180c910bb72ff4cf83efd0c7c1ec3;hb=a7f7d1bde43fc825c49afea3f946f5b4b3d563e0;hp=dcf7ce1a69ec58b252c4dcf1bc06ace259b5c48e;hpb=51ddf61540976fc7b09ce5ace707b27f3acc3871;p=elogind.git
diff --git a/src/shared/capability.c b/src/shared/capability.c
index dcf7ce1a6..58f00e6da 100644
--- a/src/shared/capability.c
+++ b/src/shared/capability.c
@@ -19,14 +19,9 @@
along with systemd; If not, see .
***/
-#include
-#include
#include
#include
#include
-#include
-#include
-#include
#include
#include
#include "grp.h"
@@ -55,7 +50,7 @@ unsigned long cap_last_cap(void) {
static thread_local unsigned long saved;
static thread_local bool valid = false;
_cleanup_free_ char *content = NULL;
- unsigned long p;
+ unsigned long p = 0;
int r;
if (valid)
@@ -269,12 +264,17 @@ int drop_privileges(uid_t uid, gid_t gid, uint64_t keep_capabilities) {
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;
+ /* use enough bits */
+ assert(i == 64 || (keep_capabilities >> i) == 0);
+ /* don't use too many bits */
+ assert(keep_capabilities & (1ULL << (i - 1)));
+
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");