ps: use attr/current as fallback for context
If SELINUX is enabled but the machine is using another MAC system (like apparmor), ps will fallback to just parsing "/proc/%d/attr/current", otherwise the label/context would not be properly displayed in that case. References: https://bugs.debian.org/786956 Signed-off-by: Craig Small <csmall@enc.com.au>
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@ -2,6 +2,7 @@ procps-ng-NEXT
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----------------
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* ps: sort by cgroup Debian #692279
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* ps: display control group name with -o cgname
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* ps: Fallback to attr/current for context Debian #786956
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procps-ng-3.3.11
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----------------
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73
ps/output.c
73
ps/output.c
@ -1283,67 +1283,69 @@ static int pr_lxcname(char *restrict const outbuf, const proc_t *restrict const
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/****************** FLASK & seLinux security stuff **********************/
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// move the bulk of this to libproc sometime
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#if !ENABLE_LIBSELINUX
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static int pr_context(char *restrict const outbuf, const proc_t *restrict const pp){
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char filename[48];
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size_t len;
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ssize_t num_read;
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int fd;
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// wchan file is suitable for testing
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//snprintf(filename, sizeof filename, "/proc/%d/wchan", pp->tgid);
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snprintf(filename, sizeof filename, "/proc/%d/attr/current", pp->tgid);
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fd = open(filename, O_RDONLY, 0);
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if(likely(fd==-1)) goto fail;
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num_read = read(fd, outbuf, 666);
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close(fd);
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if(unlikely(num_read<=0)) goto fail;
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outbuf[num_read] = '\0';
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len = 0;
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while(outbuf[len]>' ' && outbuf[len]<='~') len++;
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outbuf[len] = '\0';
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if(len) return len;
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fail:
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outbuf[0] = '-';
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outbuf[1] = '\0';
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return 1;
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}
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#else
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// This needs more study, considering:
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// 1. the static linking option (maybe disable this in that case)
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// 2. the -z and -Z option issue
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// 3. width of output
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static int pr_context(char *restrict const outbuf, const proc_t *restrict const pp){
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static void (*ps_freecon)(char*) = 0;
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static int (*ps_getpidcon)(pid_t pid, char **context) = 0;
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static int (*ps_is_selinux_enabled)(void) = 0;
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static int tried_load = 0;
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static int selinux_enabled = 0;
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size_t len;
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char *context;
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#if ENABLE_LIBSELINUX
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if(!ps_getpidcon && !tried_load){
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void *handle = dlopen("libselinux.so.1", RTLD_NOW);
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if(handle){
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ps_freecon = dlsym(handle, "freecon");
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if(dlerror())
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ps_freecon = 0;
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dlerror();
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ps_getpidcon = dlsym(handle, "getpidcon");
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if(dlerror())
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ps_getpidcon = 0;
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ps_is_selinux_enabled = dlsym(handle, "is_selinux_enabled");
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if(dlerror())
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ps_is_selinux_enabled = 0;
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else
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selinux_enabled = ps_is_selinux_enabled();
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}
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tried_load++;
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}
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if(ps_getpidcon && !ps_getpidcon(pp->tgid, &context)){
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#endif
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if(ps_getpidcon && selinux_enabled && !ps_getpidcon(pp->tgid, &context)){
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size_t max_len = OUTBUF_SIZE-1;
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len = strlen(context);
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if(len > max_len) len = max_len;
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memcpy(outbuf, context, len);
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if (outbuf[len-1] == '\n') --len;
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outbuf[len] = '\0';
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free(context);
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ps_freecon(context);
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}else{
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char filename[48];
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ssize_t num_read;
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int fd;
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// wchan file is suitable for testing
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//snprintf(filename, sizeof filename, "/proc/%d/wchan", pp->tgid);
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snprintf(filename, sizeof filename, "/proc/%d/attr/current", pp->tgid);
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if ((fd = open(filename, O_RDONLY, 0)) != -1) {
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num_read = read(fd, outbuf, OUTBUF_SIZE-1);
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close(fd);
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if (num_read > 0) {
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outbuf[num_read] = '\0';
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len = 0;
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while(isprint(outbuf[len]))
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len++;
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outbuf[len] = '\0';
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if(len)
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return len;
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}
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}
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outbuf[0] = '-';
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outbuf[1] = '\0';
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len = 1;
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@ -1351,9 +1353,6 @@ static int pr_context(char *restrict const outbuf, const proc_t *restrict const
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return len;
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}
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#endif
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////////////////////////////// Test code /////////////////////////////////
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// like "args"
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