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Modify canonicalize_path() so if we would return a trailing "..", throw

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an error instead.
This commit is contained in:
Bruce Momjian
2005-08-12 19:42:45 +00:00
parent a43ea120bf
commit 35379e9079
3 changed files with 59 additions and 21 deletions
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66
src/port/path.c
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@ -8,12 +8,16 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/port/path.c,v 1.54 2005/08/12 03:07:45 momjian Exp $
* $PostgreSQL: pgsql/src/port/path.c,v 1.55 2005/08/12 19:42:45 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#include "c.h"
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#include <ctype.h>
#include <sys/stat.h>
@ -226,6 +230,7 @@ canonicalize_path(char *path)
{
char *p, *to_p;
bool was_sep = false;
int pending_strips = 0;
#ifdef WIN32
/*
@ -284,19 +289,38 @@ canonicalize_path(char *path)
if (len > 2 && strcmp(path + len - 2, "/.") == 0)
trim_directory(path);
/*
* Process only a single trailing "..", and only if ".." does
* not preceed it.
* So, we only deal with "/usr/local/..", not with "/usr/local/../..".
* We don't handle the even more complex cases, like
* "usr/local/../../..".
*/
else if (len > 3 && strcmp(path + len - 3, "/..") == 0 &&
(len != 5 || strcmp(path, "../..") != 0) &&
(len < 6 || strcmp(path + len - 6, "/../..") != 0))
else if (len > 3 && strcmp(path + len - 3, "/..") == 0)
{
trim_directory(path);
trim_directory(path); /* remove directory above */
pending_strips++;
}
else if (pending_strips > 0)
{
/* If path is not "", we can keep trimming. Even if path is
* "/", we can keep trimming because trim_directory never removes
* the leading separator, and the parent directory of "/" is "/".
*/
if (*path != '\0')
{
trim_directory(path);
pending_strips--;
}
else
{
/*
* If we still have pending_strips, it means the supplied path
* was exhausted and we still have more directories to move up.
* This means that the resulting path is only parents, like
* ".." or "../..". If so, callers can not handle trailing "..",
* so we exit.
*/
#ifndef FRONTEND
elog(ERROR, "relative paths (\"..\") not supported");
#else
fprintf(stderr, _("relative paths (\"..\") not supported\n"));
exit(1);
#endif
}
}
else
break;
@ -305,8 +329,10 @@ canonicalize_path(char *path)
/*
* Extracts the actual name of the program as called -
* stripped of .exe suffix if any
* Extracts the actual name of the program as called -
* stripped of .exe suffix if any.
* The server calling this must check for NULL return
* and report the error.
*/
const char *
get_progname(const char *argv0)
@ -329,8 +355,16 @@ get_progname(const char *argv0)
progname = strdup(nodir_name);
if (progname == NULL)
{
#ifndef FRONTEND
/*
* No elog() support in postmaster at this stage,
* so return NULL and print error at the call.
*/
return NULL;
#else
fprintf(stderr, "%s: out of memory\n", nodir_name);
exit(1); /* This could exit the postmaster */
exit(1);
#endif
}
progname[strlen(progname) - (sizeof(EXE) - 1)] = '\0';
nodir_name = progname;