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Code Issues Releases Wiki Activity

Make call to open a temporary file name safe during NZF creation (#38331)

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Based on a patch sent in by Tony Finch <dot@dotat.at>.

Also fix win32 implementation of isc_file_openunique() to use a random
filename instead of using the process id.
This commit is contained in:
Mukund Sivaraman 2015-01-16 18:28:35 +05:30
parent f91c369b4a
commit b05a50c852
4 changed files with 17 additions and 8 deletions
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3
CHANGES
View File

@ -1,3 +1,6 @@
4036. [bug] Make call to open a temporary file name safe during
NZF creation. [RT #38331]
4035. [bug] Close temporary and NZF FILE pointers before moving
the former into the latter's place, as required on
Windows. [RT #38332]

2
bin/named/server.c
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@ -9197,7 +9197,7 @@ nzf_remove(const char *nzfile, const char *viewname, const char *zonename) {
/* Create a temporary file */
CHECK(isc_file_template("", "nzf-XXXXXXXX", tmp, sizeof(tmp)));
CHECK(isc_stdio_open(tmp, "w", &ofp));
CHECK(isc_file_openunique(tmp, &ofp));
CHECK(add_comment(ofp, viewname));
/* Look for the entry for that zone */

8
lib/isc/unix/file.c
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@ -256,14 +256,13 @@ isc_file_template(const char *path, const char *templet, char *buf,
return (ISC_R_SUCCESS);
}
static char alphnum[] =
static const char alphnum[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
isc_result_t
isc_file_renameunique(const char *file, char *templet) {
char *x;
char *cp;
isc_uint32_t which;
REQUIRE(file != NULL);
REQUIRE(templet != NULL);
@ -276,6 +275,8 @@ isc_file_renameunique(const char *file, char *templet) {
x = cp--;
while (cp >= templet && *cp == 'X') {
isc_uint32_t which;
isc_random_get(&which);
*cp = alphnum[which % (sizeof(alphnum) - 1)];
x = cp--;
@ -321,7 +322,6 @@ isc_file_openuniquemode(char *templet, int mode, FILE **fp) {
isc_result_t result = ISC_R_SUCCESS;
char *x;
char *cp;
isc_uint32_t which;
REQUIRE(templet != NULL);
REQUIRE(fp != NULL && *fp == NULL);
@ -334,6 +334,8 @@ isc_file_openuniquemode(char *templet, int mode, FILE **fp) {
x = cp--;
while (cp >= templet && *cp == 'X') {
isc_uint32_t which;
isc_random_get(&which);
*cp = alphnum[which % (sizeof(alphnum) - 1)];
x = cp--;

12
lib/isc/win32/file.c
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@ -33,6 +33,7 @@
#include <isc/file.h>
#include <isc/mem.h>
#include <isc/print.h>
#include <isc/random.h>
#include <isc/result.h>
#include <isc/sha2.h>
#include <isc/stat.h>
@ -42,6 +43,9 @@
#include "errno2result.h"
static const char alphnum[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
/*
* Emulate UNIX mkstemp, which returns an open FD to the new file
*
@ -50,7 +54,6 @@ static int
gettemp(char *path, isc_boolean_t binary, int *doopen) {
char *start, *trv;
struct stat sbuf;
int pid;
int flags = O_CREAT|O_EXCL|O_RDWR;
if (binary)
@ -58,11 +61,12 @@ gettemp(char *path, isc_boolean_t binary, int *doopen) {
trv = strrchr(path, 'X');
trv++;
pid = getpid();
/* extra X's get set to 0's */
while (*--trv == 'X') {
*trv = (pid % 10) + '0';
pid /= 10;
isc_uint32_t which;
isc_random_get(&which);
*trv = alphnum[which % (sizeof(alphnum) - 1)];
}
/*
* check the target directory; if you have six X's and it