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when called with the setid bit change euid to uid sooner to make sure that we can access our own files even when we dropped most capabilities. (Closes #21)

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1455 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2007-05-25 20:35:30 +00:00
parent 65e8761683
commit 4d88fcd59d
3 changed files with 66 additions and 32 deletions
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34
src/pulsecore/core-util.c
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@ -51,6 +51,10 @@
#include <sys/resource.h>
#endif
#ifdef HAVE_SYS_CAPABILITY_H
#include <sys/capability.h>
#endif
#ifdef HAVE_PTHREAD
#include <pthread.h>
#endif
@ -481,7 +485,23 @@ char *pa_strlcpy(char *b, const char *s, size_t l) {
sensible: set the nice level to -15 and enable realtime scheduling if
supported.*/
void pa_raise_priority(void) {
#if defined(HAVE_SYS_CAPABILITY_H)
cap_t caps;
/* Temporarily acquire CAP_SYS_NICE in the effective set */
if ((caps = cap_get_proc())) {
cap_t caps_new;
cap_value_t nice_cap = CAP_SYS_NICE;
if ((caps_new = cap_dup(caps))) {
cap_set_flag(caps_new, CAP_EFFECTIVE, 1, &nice_cap, CAP_SET);
cap_set_flag(caps_new, CAP_PERMITTED, 1, &nice_cap, CAP_SET);
cap_set_proc(caps_new);
cap_free(caps_new);
}
}
#endif
#ifdef HAVE_SYS_RESOURCE_H
if (setpriority(PRIO_PROCESS, 0, NICE_LEVEL) < 0)
pa_log_warn("setpriority(): %s", pa_cstrerror(errno));
@ -495,13 +515,13 @@ void pa_raise_priority(void) {
if (sched_getparam(0, &sp) < 0) {
pa_log("sched_getparam(): %s", pa_cstrerror(errno));
return;
goto fail;
}
sp.sched_priority = 1;
if (sched_setscheduler(0, SCHED_FIFO, &sp) < 0) {
pa_log_warn("sched_setscheduler(): %s", pa_cstrerror(errno));
return;
goto fail;
}
pa_log_info("Successfully enabled SCHED_FIFO scheduling.");
@ -514,6 +534,16 @@ void pa_raise_priority(void) {
else
pa_log_info("Successfully gained high priority class.");
#endif
fail:
#if defined(HAVE_SYS_CAPABILITY_H)
if (caps) {
/* Restore original caps */
cap_set_proc(caps);
cap_free(caps);
}
#endif
}
/* Reset the priority to normal, inverting the changes made by pa_raise_priority() */