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Dropped "-f" format flag for pidof command as it

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could be used to print information from memory or crash
pidof. Replaced flag with "-d" which allows for a custom
separator to be used between listed PIDs.
Patch supplied by KatolaZ.
This commit is contained in:
Jesse Smith 2019-03-20 13:46:36 -03:00
parent 4e2ad6a698
commit f1da344565
3 changed files with 16 additions and 98 deletions
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10
doc/Changelog
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@ -4,11 +4,11 @@ sysvinit (2.95) unreleased; urgency=low
* Fixed various typos and control codes in manual pages.
Patch provided by Bjarni Ingi Gislason.
* Patched pidof so that the -f flag does not print memory information
from the stack when passed a specially crafted format string.
Also prevent segfault when "%s" is used in a format string.
Special characters for the format string can be found in the man
page for pidof.
* Dropped "-f" format flag for pidof command as it
could be used to print information from memory or crash
pidof. Replaced flag with "-d" which allows for a custom
separator to be used between listed PIDs.
Patch supplied by KatolaZ.
sysvinit (2.94) released; urgency=low

12
man/pidof.8
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@ -28,8 +28,8 @@ pidof -- find the process ID of a running program.
.IR omitpid[,omitpid...] ]
.RB [ \-o
.IR omitpid[,omitpid...]... ]
.RB [ \-f
.IR format ]
.RB [ \-d
.IR sep ]
.B program
.RB [ program... ]
.SH DESCRIPTION
@ -64,15 +64,13 @@ a status of true or false to indicate whether a matching PID was found.
.IP \-x
Scripts too - this causes the program to also return process id's of
shells running the named scripts.
.IP "-d \fIsep\fP"
Tells \fIpidof\fP to use \fIsep\fP as an output separator if more than one PID
is shown. The default separator is a space.
.IP "-o \fIomitpid\fP"
Tells \fIpidof\fP to omit processes with that process id. The special
pid \fB%PPID\fP can be used to name the parent process of the \fIpidof\fP
program, in other words the calling shell or shell script.
.IP "-f \fIformat\fP"
Tells \fIpidof\fP to format the process IDs in the given \fIprintf\fP style string.
For example \fB" -p%d"\fP is useful for \fIstrace\fP.
The "%d" symbol is used as a place holder for the PID to be printed. A "\\n" can
be used to cause a newline to be printed. For example \fB" %d\\n"\fP.
.SH "EXIT STATUS"
.TP
.B 0

92
src/killall5.c
View File

@ -948,8 +948,8 @@ void pidof_usage(void)
{
printf("pidof usage: [options] <program-name>\n\n");
printf(" -c Return PIDs with the same root directory\n");
printf(" -d <sep> Use the provided character as output separator\n");
printf(" -h Display this help text\n");
printf(" -f <format> Display PIDs in a given printf-style format\n");
printf(" -n Avoid using stat system function on network shares\n");
printf(" -o <pid> Omit results with a given PID\n");
printf(" -q Quiet mode. Do not display output\n");
@ -985,66 +985,6 @@ void nsyslog(int pri, char *fmt, ...)
#define PIDOF_NETFS 0x04
#define PIDOF_QUIET 0x08
/* Replace elements (from) of the original string
with new elements (to).
Returns the new string on success or NULL on failure.
Free the returnedstring after use.
*/
char *Replace_String(char *from, char *to, char *original)
{
int from_length, to_length;
int source_length, destination_length;
int replace_count = 0;
char *replace_position;
char *destination_string;
char *source_position, *destination_position;
if ( (! from) || (! to) || (! original) )
return NULL;
from_length = strlen(from);
to_length = strlen(to);
source_length = strlen(original);
replace_position = strstr(original, from);
/* There is nothing to replace, return original string */
if (! replace_position)
return strdup(original);
/* count number of times we need to perform replacement */
while (replace_position)
{
replace_count++;
replace_position++;
replace_position = strstr(replace_position, from);
}
/* calculate length and allocate the new string */
destination_length = source_length + ( (to_length - from_length) * replace_count);
destination_string = calloc(destination_length, sizeof(char));
if (! destination_string)
return NULL;
/* Copy source string up to the part we need to replace. Then jump over the replaced bit */
source_position = original;
destination_position = destination_string;
replace_position = strstr(original, from);
while (replace_position)
{
for ( ; source_position < replace_position; source_position++)
{
destination_position[0] = source_position[0];
destination_position++;
}
strcat(destination_position, to);
source_position += from_length;
destination_position += to_length;
replace_position = strstr(source_position, from);
}
/* Replaced all the items, now copy the tail end of the original string */
strcat(destination_position, source_position);
return destination_string;
}
/*
* Pidof functionality.
*/
@ -1059,7 +999,7 @@ int main_pidof(int argc, char **argv)
int chroot_check = 0;
struct stat st;
char tmp[512];
char *format = NULL;
char sep = ' ';
omit = (OMIT*)0;
nlist = (NFS*)0;
@ -1068,7 +1008,7 @@ int main_pidof(int argc, char **argv)
if ((token = getenv("PIDOF_NETFS")) && (strcmp(token,"no") != 0))
flags |= PIDOF_NETFS;
while ((opt = getopt(argc,argv,"qhco:f:sxn")) != EOF) switch (opt) {
while ((opt = getopt(argc,argv,"qhco:d:sxn")) != EOF) switch (opt) {
case '?':
nsyslog(LOG_ERR,"invalid options on command line!\n");
closelog();
@ -1079,8 +1019,8 @@ int main_pidof(int argc, char **argv)
case 'h':
pidof_usage();
exit(0);
case 'f':
format = optarg;
case 'd':
sep = optarg[0];
break;
case 'o':
here = optarg;
@ -1178,29 +1118,9 @@ int main_pidof(int argc, char **argv)
}
if ( ~flags & PIDOF_QUIET ) {
if (format)
{
char *show_string, *final_string;
char my_pid[32];
snprintf(my_pid, 32, "%d", p->pid);
show_string = Replace_String("%d", my_pid, format);
final_string = Replace_String("\\n", "\n", show_string);
if (show_string) free(show_string);
if (final_string)
{
printf("%s", final_string);
free(final_string);
}
else
fprintf(stderr, "Cannot handle format provided by -f\n");
/* printf(format, p->pid); */
}
else
{
if (! first)
printf(" ");
printf("%c", sep);
printf("%d", p->pid);
}
}
first = 0;
}