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procps/lib/signals.c
Qualys Security Advisory d3ff255fa5 0041-proc/sig.c: Harden print_given_signals(). 
And signal_name_to_number().

---------------------------- adapted for newlib branch
. file has been moved to: lib/signals.c
. only 'signal_name_to_number()' was impacted
. function 'print_given_signals()' no longer exists
. thus the bulk of original patch no longer applicable

Signed-off-by: Jim Warner <james.warner@comcast.net>
2018-06-09 21:35:19 +10:00

317 lines
8.4 KiB
C
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/*
* signals.c - signal name, and number, conversions
* Copyright 1998-2003 by Albert Cahalan
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <ctype.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "signals.h"
#include "c.h"
/* Linux signals:
*
* SIGSYS is required by Unix98.
* SIGEMT is part of SysV, BSD, and ancient UNIX tradition.
*
* They are provided by these Linux ports: alpha, mips, sparc, and sparc64.
* You get SIGSTKFLT and SIGUNUSED instead on i386, m68k, ppc, and arm.
* (this is a Linux & libc bug -- both must be fixed)
*
* Total garbage: SIGIO SIGINFO SIGIOT SIGCLD
* (popular ones are handled as aliases)
* SIGLOST
* (except on the Hurd; reused to mean a server died)
* Nearly garbage: SIGSTKFLT SIGUNUSED (nothing else to fill slots)
*/
/* Linux 2.3.29 replaces SIGUNUSED with the standard SIGSYS signal */
#ifndef SIGSYS
# warning Standards require that <signal.h> define SIGSYS
# define SIGSYS SIGUNUSED
#endif
/* If we see both, it is likely SIGSTKFLT (junk) was replaced. */
#ifdef SIGEMT
# undef SIGSTKFLT
#endif
#ifndef SIGRTMIN
# warning Standards require that <signal.h> define SIGRTMIN; assuming 32
# define SIGRTMIN 32
#endif
/* It seems the SPARC libc does not know the kernel supports SIGPWR. */
#if defined(__linux__) && !defined(SIGPWR)
# warning Your header files lack SIGPWR. (assuming it is number 29)
# define SIGPWR 29
#endif
typedef struct mapstruct {
const char *name;
int num;
} mapstruct;
static const mapstruct sigtable[] = {
{"ABRT", SIGABRT}, /* IOT */
{"ALRM", SIGALRM},
{"BUS", SIGBUS},
{"CHLD", SIGCHLD}, /* CLD */
{"CONT", SIGCONT},
#ifdef SIGEMT
{"EMT", SIGEMT},
#endif
{"FPE", SIGFPE},
{"HUP", SIGHUP},
{"ILL", SIGILL},
{"INT", SIGINT},
{"KILL", SIGKILL},
#if defined(__GNU__)
{"LOST", SIGLOST}, /* Hurd-specific */
#endif
{"PIPE", SIGPIPE},
{"POLL", SIGPOLL}, /* IO */
{"PROF", SIGPROF},
#ifdef SIGPWR
{"PWR", SIGPWR},
#endif
{"QUIT", SIGQUIT},
{"SEGV", SIGSEGV},
#ifdef SIGSTKFLT
{"STKFLT", SIGSTKFLT},
#endif
{"STOP", SIGSTOP},
{"SYS", SIGSYS}, /* UNUSED */
{"TERM", SIGTERM},
{"TRAP", SIGTRAP},
{"TSTP", SIGTSTP},
{"TTIN", SIGTTIN},
{"TTOU", SIGTTOU},
{"URG", SIGURG},
{"USR1", SIGUSR1},
{"USR2", SIGUSR2},
{"VTALRM", SIGVTALRM},
{"WINCH", SIGWINCH},
{"XCPU", SIGXCPU},
{"XFSZ", SIGXFSZ}
};
#define number_of_signals (sizeof(sigtable)/sizeof(mapstruct))
#define XJOIN(a, b) JOIN(a, b)
#define JOIN(a, b) a##b
#define STATIC_ASSERT(x) typedef int XJOIN(static_assert_on_line_,__LINE__)[(x) ? 1 : -1]
/* sanity check */
#if defined(__linux__)
STATIC_ASSERT(number_of_signals == 31);
#elif defined(__FreeBSD_kernel__) || defined(__FreeBSD__)
STATIC_ASSERT(number_of_signals == 30);
#elif defined(__GNU__)
STATIC_ASSERT(number_of_signals == 31);
#elif defined(__CYGWIN__)
STATIC_ASSERT(number_of_signals == 31);
#else
# warning Unknown operating system; assuming number_of_signals is correct
#endif
static int compare_signal_names(const void *a, const void *b){
return strcasecmp( ((const mapstruct*)a)->name, ((const mapstruct*)b)->name );
}
const char *get_sigtable_name(int row)
{
if (row < 0 || row >= number_of_signals)
return NULL;
return sigtable[row].name;
}
const int get_sigtable_num(int row)
{
if (row < 0 || row >= number_of_signals)
return -1;
return sigtable[row].num;
}
/* return -1 on failure */
int signal_name_to_number(const char *restrict name){
long val;
int offset;
/* clean up name */
if(!strncasecmp(name,"SIG",3))
name += 3;
if(!strcasecmp(name,"CLD"))
return SIGCHLD;
if(!strcasecmp(name,"IO"))
return SIGPOLL;
if(!strcasecmp(name,"IOT"))
return SIGABRT;
/* search the table */
{
const mapstruct ms = {name,0};
const mapstruct *restrict const ptr = bsearch(
&ms,
sigtable,
number_of_signals,
sizeof(mapstruct),
compare_signal_names);
if(ptr)
return ptr->num;
}
if(!strcasecmp(name,"RTMIN"))
return SIGRTMIN;
if(!strcasecmp(name,"EXIT"))
return 0;
if(!strcasecmp(name,"NULL"))
return 0;
offset = 0;
if(!strncasecmp(name,"RTMIN+",6)) {
name += 6;
offset = SIGRTMIN;
}
/* not found, so try as a number */
{
char *endp;
val = strtol(name,&endp,10);
if(*endp || endp==name)
return -1; /* not valid */
}
if(val<0 || val+SIGRTMIN>127)
return -1; /* not valid */
return val+offset;
}
const char *signal_number_to_name(int signo)
{
static char buf[32];
int n = number_of_signals;
signo &= 0x7f; /* need to process exit values too */
while (n--) {
if(sigtable[n].num==signo)
return sigtable[n].name;
}
if (signo == SIGRTMIN)
return "RTMIN";
if (signo)
sprintf(buf, "RTMIN+%d", signo-SIGRTMIN);
else
strcpy(buf,"0"); /* AIX has NULL; Solaris has EXIT */
return buf;
}
int skill_sig_option(int *argc, char **argv)
{
int i;
int signo = -1;
for (i = 1; i < *argc; i++) {
if (argv[i][0] == '-') {
signo = signal_name_to_number(argv[i] + 1);
if (-1 < signo) {
memmove(argv + i, argv + i + 1,
sizeof(char *) * (*argc - i));
(*argc)--;
return signo;
}
}
}
return signo;
}
/* strtosig is similar to print_given_signals() with exception, that
* this function takes a string, and converts it to a signal name or
* a number string depending on which way a round conversion is
* queried. Non-existing signals return NULL. Notice that the
* returned string should be freed after use.
*/
char *strtosig(const char *restrict s)
{
char *converted = NULL, *copy, *p, *endp;
int i, numsignal = 0;
copy = strdup(s);
if (!copy)
xerrx(EXIT_FAILURE, "cannot duplicate string");
for (p = copy; *p != '\0'; p++)
*p = toupper(*p);
p = copy;
if (p[0] == 'S' && p[1] == 'I' && p[2] == 'G')
p += 3;
if (isdigit(*p)){
numsignal = strtol(s,&endp,10);
if(*endp || endp==s){
free(p);
return NULL; /* not valid */
}
}
if (numsignal){
for (i = 0; i < number_of_signals; i++){
if (numsignal == get_sigtable_num(i)){
converted = strdup(get_sigtable_name(i));
break;
}
}
} else {
for (i = 0; i < number_of_signals; i++){
if (strcmp(p, get_sigtable_name(i)) == 0){
converted = malloc(12);
if (converted)
snprintf(converted, 12, "%d", sigtable[i].num);
break;
}
}
}
free(copy);
return converted;
}
void unix_print_signals(void)
{
int pos = 0;
int i = 0;
while(++i <= number_of_signals){
if(i-1) printf("%c", (pos>73)?(pos=0,'\n'):(pos++,' ') );
pos += printf("%s", signal_number_to_name(i));
}
printf("\n");
}
void pretty_print_signals(void)
{
int i = 0;
while(++i <= number_of_signals){
int n;
n = printf("%2d %s", i, signal_number_to_name(i));
if(n>0 && i%7)
printf("%s", " \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" + n);
else
printf("\n");
}
if((i-1)%7) printf("\n");
}
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