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util-linux
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This commit is contained in:
Érico Rolim 2020-11-15 11:52:26 -03:00
parent 2db1cc1191
commit dd15639192
1 changed files with 6 additions and 8 deletions
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14
lib/caputils.c
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@ -20,7 +20,7 @@
#include "caputils.h"
#include "pathnames.h"
static int test_cap(int cap)
static int test_cap(unsigned int cap)
{
/* prctl returns 0 or 1 for valid caps, -1 otherwise */
return prctl(PR_CAPBSET_READ, cap, 0, 0, 0) >= 0;
@ -35,19 +35,17 @@ int cap_last_cap(void)
if (last_cap) return last_cap;
/* binary search over capabilities */
int cap0 = 0, cap1 = INT_MAX;
while (1) {
int cap = (cap0 + cap1) / 2;
/* starting with cap=INT_MAX means we always know that cap1 is invalid */
unsigned int cap0 = 0, cap1 = INT_MAX, cap = INT_MAX;
while (cap0 + 1 < cap1) {
if (test_cap(cap)) {
cap0 = cap;
} else {
cap1 = cap;
}
if (cap0 + 1 == cap1) break;
cap = (cap0 + cap1) / 2;
}
/* either cap0 or cap1 can be the last cap, test */
last_cap = test_cap(cap1) ? cap1 : cap0;
last_cap = cap;
return last_cap;
}