checkpoint

NEWS

@@ -1,3 +1,9 @@
+procps-3.1.4 --> procps-3.1.5
+
+ancient (2.x.xx era) data corruption fixed
+serious hidden-process problem (3.1.3+) fixed
+escape sequence vulnerability fixed
+
 procps-3.1.3 --> procps-3.1.4
 
 top: was trashing every "3" in a command name

proc/readproc.c

@@ -77,6 +77,13 @@ void freeproc(proc_t* p) {
 }
 
 
+// 2.5.xx looks like:
+//
+// "State:\t%s\n"
+// "Tgid:\t%d\n"
+// "Pid:\t%d\n"
+// "PPid:\t%d\n"
+// "TracerPid:\t%d\n"
 
 static void status2proc(const char *S, proc_t *restrict P){
     char* tmp;
@@ -105,11 +112,9 @@ static void status2proc(const char *S, proc_t *restrict P){
     if(likely(tmp)) P->state = tmp[7];
     else fprintf(stderr, "Internal error!\n");
 
-    tmp = strstr (S,"Pid:");
+    tmp = strstr (S,"PPid:");
     if(likely(tmp)) sscanf (tmp,
-        "Pid:\t%d\n"
         "PPid:\t%d\n",
-        &P->pid,
         &P->ppid
     );
     else fprintf(stderr, "Internal error!\n");
@@ -166,10 +171,8 @@ static void status2proc(const char *S, proc_t *restrict P){
 
 
 
-/* stat2proc() makes sure it can handle arbitrary executable file basenames
+/* Reads /proc/*/stat files, being careful not to trip over processes with
- * for `cmd', i.e. those with embedded whitespace or embedded ')'s.
+ * names like ":-) 1 2 3 4 5 6".
- * Such names confuse %s (see scanf(3)), so the string is split and %39c
- * is used instead. (except for embedded ')' "(%[^)]c)" would work.
  */
 static void stat2proc(const char* S, proc_t *restrict P) {
     unsigned num;
@@ -181,9 +184,8 @@ static void stat2proc(const char* S, proc_t *restrict P) {
     P->rtprio = -1;
     P->sched = -1;
 
-    P->pid = strtol(S, &tmp, 10);
+    S = strchr(S, '(') + 1;
-    S = tmp + 2;
+    tmp = strrchr(S, ')');
-    tmp = strrchr(S, ')');	 // split into "PID (cmd" and "<rest>"
     num = tmp - S;
     if(unlikely(num >= sizeof P->cmd)) num = sizeof P->cmd - 1;
     memcpy(P->cmd, S, num);
@@ -376,16 +378,20 @@ next_proc:				/* get next PID for consideration */
 #define flags (PT->flags)
 
     if (flags & PROC_PID) {
-	if (unlikely(!*PT->pids))	/* set to next item in pids */
+        pid_t pid = *(PT->pids)++;
-	    return NULL;
+	if (unlikely(!pid)) return NULL;
-	sprintf(path, "/proc/%d", *(PT->pids)++);
+	p->pid = pid;
+	snprintf(path, sizeof path, "/proc/%d", pid);
     } else {					/* get next numeric /proc ent */
 	for (;;) {
 	    ent = readdir(PT->procfs);
 	    if(unlikely(unlikely(!ent) || unlikely(!ent->d_name))) return NULL;
-	    if(likely( likely(*ent->d_name > '0') && likely(*ent->d_name < '9') )) break;
+	    if(likely( likely(*ent->d_name > '0') && likely(*ent->d_name <= '9') )) break;
 	}
-	sprintf(path, "/proc/%s", ent->d_name);
+	p->pid = strtoul(ent->d_name, NULL, 10);
+	memcpy(path, "/proc/", 6);
+	strcpy(path+6, ent->d_name);  // trust /proc to not contain evil top-level entries
+//	snprintf(path, sizeof path, "/proc/%s", ent->d_name);
     }
 #ifdef FLASK_LINUX
     if ( stat_secure(path, &sb, &secsid) == -1 ) /* no such dirent (anymore) */
@@ -452,9 +458,6 @@ next_proc:				/* get next PID for consideration */
     else
         p->environ = NULL;
     
-    if (unlikely(p->state == 'Z'))	/* fixup cmd for zombies */
-	strncat(p->cmd," <defunct>", sizeof p->cmd);
-
     return p;
 }
 #undef flags
@@ -484,12 +487,15 @@ next_proc:				/* get next PID for consideration */
 /*printf("PT->flags is 0x%08x\n", PT->flags);*/
 #define flags (PT->flags)
 
-	while ((ent = readdir(PT->procfs)) &&
+    for (;;) {
-	       (*ent->d_name < '0' || *ent->d_name > '9'))
+	ent = readdir(PT->procfs);
-	    ;
+	if(unlikely(unlikely(!ent) || unlikely(!ent->d_name))) return NULL;
-	if (!ent || !ent->d_name)
+	if(likely( likely(*ent->d_name > '0') && likely(*ent->d_name <= '9') )) break;
-	    return NULL;
+    }
-	sprintf(path, "/proc/%s", ent->d_name);
+    p->pid = strtoul(ent->d_name, NULL, 10);
+    memcpy(path, "/proc/", 6);
+    strcpy(path+6, ent->d_name);  // trust /proc to not contain evil top-level entries
+//  snprintf(path, sizeof path, "/proc/%s", ent->d_name);
 
 #ifdef FLASK_LINUX
     if (stat_secure(path, &sb, &secsid) == -1) /* no such dirent (anymore) */
@@ -550,9 +556,6 @@ next_proc:				/* get next PID for consideration */
     else
         p->environ = NULL;
     
-    if (p->state == 'Z')		/* fixup cmd for zombies */
-	strncat(p->cmd," <defunct>", sizeof p->cmd);
-
     return p;
 }
 #undef flags

ps/TRANSLATION

@@ -24,5 +24,5 @@ I think these are the most important options:
 -f            full format
 s             signal format
 u             user-oriented format
---forest      ASCII art forest (process heirarchy)
+--forest      ASCII art forest (process hierarchy)
 c             show true command name

ps/help.c

@@ -42,7 +42,7 @@ const char *help_message =
 "-V,V show version       L  list format codes  f  ASCII art forest\n"
 "-m,m show threads       S  children in sum    -y change -l format\n"
 "-n,N set namelist file  c  true command name  n  numeric WCHAN,UID\n"
-"-w,w wide output        e  show environment   -H process heirarchy\n"
+"-w,w wide output        e  show environment   -H process hierarchy\n"
 ;
 
 

ps/module.mk

@@ -11,7 +11,7 @@ DIRS += ps/
 # a file to create
 ALL += ps/ps
 
-PS_C    := display escape global help output parser select sortformat
+PS_C    := display global help output parser select sortformat
 PSNAMES := $(addprefix ps/,$(PS_C))
 PSOBJ   := $(addsuffix .o,$(PSNAMES))
 PSSRC   := $(addsuffix .c,$(PSNAMES))

ps/parser.c

@@ -253,7 +253,7 @@ static const char *parse_sysv_option(void){
       selection_list->typecode = SEL_RGID;
       return NULL; /* can't have any more options */
     case 'H':     /* another nice HP/UX feature */
-      trace("-H Process heirarchy (like ASCII art forest option)\n");
+      trace("-H Process hierarchy (like ASCII art forest option)\n");
       forest_type = 'u';
       break;
     case 'L':  /*  */