b817644b5b
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=142713 /sbin/udevstart segfaults on an ATIIXP chipset which is not supported well by the kernel yet. There, /proc/ide/hda/media can not be read (EIO error) and udevstart seems to give a null-pointer to an SELinux function checking the media-type.
149 lines
3 KiB
C
149 lines
3 KiB
C
#ifndef SELINUX_H
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#define SELINUX_H
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#ifndef USE_SELINUX
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static inline void selinux_setfilecon(char *file, unsigned int mode) {}
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static inline void selinux_setfscreatecon(char *file, unsigned int mode) {}
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static inline void selinux_init(void) {}
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static inline void selinux_restore(void) {}
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#else
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#include <selinux/selinux.h>
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#include <stdio.h>
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#include <limits.h>
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#include <ctype.h>
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static int selinux_enabled=-1;
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static security_context_t prev_scontext=NULL;
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static inline int is_selinux_running(void)
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{
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if (selinux_enabled == -1)
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return selinux_enabled = is_selinux_enabled() > 0;
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return selinux_enabled;
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}
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static inline int selinux_get_media(char *path, int mode, char **media)
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{
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FILE *fp;
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char buf[PATH_MAX];
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char mediabuf[PATH_MAX];
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int ret = -1;
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*media = NULL;
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if (!(mode && S_IFBLK)) {
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return -1;
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}
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snprintf(buf, sizeof(buf), "/proc/ide/%s/media", basename(path));
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fp=fopen(buf,"r");
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if (!fp)
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goto out;
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mediabuf[0] = '\0';
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if (fgets(mediabuf, sizeof(mediabuf), fp) == NULL)
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goto close_out;
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int size = strlen(mediabuf);
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while (size-- > 0) {
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if (isspace(mediabuf[size])) {
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mediabuf[size]='\0';
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} else {
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break;
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}
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}
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*media = strdup(mediabuf);
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info("selinux_get_media(%s)->%s \n", path, *media);
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ret = 0;
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close_out:
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fclose(fp);
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out:
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return ret;
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}
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static inline void selinux_setfilecon(char *file, unsigned int mode)
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{
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if (is_selinux_running()) {
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security_context_t scontext=NULL;
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char *media;
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int ret=selinux_get_media(file, mode, &media);
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if (ret == 0) {
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ret = matchmediacon(media, &scontext);
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free(media);
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}
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if (ret == -1)
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if (matchpathcon(file, mode, &scontext) < 0) {
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dbg("matchpathcon(%s) failed\n", file);
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return;
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}
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if (setfilecon(file, scontext) < 0)
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dbg("setfiles %s failed with error '%s'",
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file, strerror(errno));
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freecon(scontext);
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}
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}
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static inline void selinux_setfscreatecon(char *file, unsigned int mode)
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{
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int retval = 0;
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security_context_t scontext=NULL;
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if (is_selinux_running()) {
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char *media;
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int ret = selinux_get_media(file, mode, &media);
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if (ret == 0) {
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ret = matchmediacon(media, &scontext);
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free(media);
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}
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if (ret == -1)
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if (matchpathcon(file, mode, &scontext) < 0) {
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dbg("matchpathcon(%s) failed\n", file);
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return;
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}
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retval = setfscreatecon(scontext);
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if (retval < 0)
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dbg("setfiles %s failed with error '%s'",
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file, strerror(errno));
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freecon(scontext);
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}
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}
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static inline void selinux_init(void)
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{
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/*
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* record the present security context, for file-creation
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* restoration creation purposes.
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*/
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if (is_selinux_running()) {
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if (getfscreatecon(&prev_scontext) < 0) {
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dbg("getfscreatecon failed\n");
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}
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prev_scontext = NULL;
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}
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}
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static inline void selinux_restore(void)
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{
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if (is_selinux_running()) {
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/* reset the file create context to its former glory */
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if (setfscreatecon(prev_scontext) < 0)
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dbg("setfscreatecon failed\n");
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if (prev_scontext) {
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freecon(prev_scontext);
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prev_scontext = NULL;
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}
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}
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}
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#endif /* USE_SELINUX */
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#endif /* SELINUX_H */
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