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support file-based capabilities instead of SUID root for giving PA rights to acquire RT/HP scheduling: setcap cap_sys_nice=ep /usr/bin/pulseaudio

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This commit is contained in:
Lennart Poettering 2008-06-22 01:48:46 +02:00
parent ab93f2a087
commit 8885ddf716
3 changed files with 48 additions and 17 deletions
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31
src/daemon/caps.c
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@ -91,13 +91,18 @@ void pa_limit_caps(void) {
pa_assert_se(cap_clear(caps) == 0);
pa_assert_se(cap_set_flag(caps, CAP_EFFECTIVE, 1, &nice_cap, CAP_SET) == 0);
pa_assert_se(cap_set_flag(caps, CAP_PERMITTED, 1, &nice_cap, CAP_SET) == 0);
pa_assert_se(cap_set_proc(caps) == 0);
pa_assert_se(prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == 0);
pa_log_info("Dropped capabilities successfully.");
if (cap_set_proc(caps) < 0)
/* Hmm, so we couldn't limit our caps, which probably means we
* hadn't any in the first place, so let's just make sure of
* that */
pa_drop_caps();
else
pa_log_info("Limited capabilities successfully to CAP_SYS_NICE.");
pa_assert_se(cap_free(caps) == 0);
pa_assert_se(prctl(PR_SET_KEEPCAPS, 1, 0, 0, 0) == 0);
}
/* Drop all capabilities, effectively becoming a normal user */
@ -110,17 +115,33 @@ void pa_drop_caps(void) {
pa_assert_se(cap_clear(caps) == 0);
pa_assert_se(cap_set_proc(caps) == 0);
pa_assert_se(cap_free(caps) == 0);
pa_assert_se(!pa_have_caps());
}
pa_bool_t pa_have_caps(void) {
cap_t caps;
cap_flag_value_t flag = CAP_CLEAR;
pa_assert_se(caps = cap_get_proc());
pa_assert_se(cap_get_flag(caps, CAP_SYS_NICE, CAP_EFFECTIVE, &flag) >= 0);
pa_assert_se(cap_free(caps) == 0);
return flag == CAP_SET;
}
#else
/* NOOPs in case capabilities are not available. */
void pa_limit_caps(void) {
return 0;
}
void pa_drop_caps(void) {
pa_drop_root();
}
pa_bool_t pa_have_caps(void) {
return FALSE;
}
#endif