diff options
Diffstat (limited to 'progs/setcap.c')
-rw-r--r-- | progs/setcap.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/progs/setcap.c b/progs/setcap.c index 0215fc4..83090ae 100644 --- a/progs/setcap.c +++ b/progs/setcap.c @@ -26,7 +26,7 @@ static void usage(void) static int read_caps(int quiet, const char *filename, char *buffer) { - int i=MAXCAP; + int i = MAXCAP; if (!quiet) { fprintf(stderr, "Please enter caps for file [empty line to end]:\n"); @@ -170,10 +170,33 @@ int main(int argc, char **argv) } retval = cap_set_file(*++argv, cap_d); if (retval != 0) { + int explained = 0; +#ifdef linux + cap_value_t cap; + cap_flag_value_t per_state; + + for (cap = 0; + cap_get_flag(cap_d, cap, CAP_PERMITTED, &per_state) != -1; + cap++) { + cap_flag_value_t inh_state, eff_state; + + cap_get_flag(cap_d, cap, CAP_INHERITABLE, &inh_state); + cap_get_flag(cap_d, cap, CAP_EFFECTIVE, &eff_state); + if ((inh_state | per_state) != eff_state) { + fprintf(stderr, "NOTE: Under Linux, effective file capabilities must either be empty, or\n" + " exactly match the union of selected permitted and inheritable bits.\n"); + explained = 1; + break; + } + } +#endif /* def linux */ + fprintf(stderr, "Failed to set capabilities on file `%s' (%s)\n", argv[0], strerror(errno)); - usage(); + if (!explained) { + usage(); + } } } if (cap_d) { |