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Fix proposal for libtokencap

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Avoiding fopen API seems buggy on NetBSD.
This commit is contained in:
David Carlier
2019-10-28 11:01:37 +00:00
parent 3ad5316dd1
commit 942f8d0ec9
2 changed files with 16 additions and 5 deletions
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3
libtokencap/Makefile
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@ -33,6 +33,9 @@ endif
ifeq "$(shell uname)" "OpenBSD"
TARGETS = libtokencap.so
endif
ifeq "$(shell uname)" "NetBSD"
TARGETS = libtokencap.so
endif
all: $(TARGETS)
libtokencap.so: libtokencap.so.c ../config.h

18
libtokencap/libtokencap.so.c
View File

@ -23,6 +23,7 @@
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <fcntl.h>
#include "../types.h"
#include "../config.h"
@ -49,7 +50,7 @@ static struct mapping { void *st, *en; } __tokencap_ro[MAX_MAPPINGS];
static u32 __tokencap_ro_cnt;
static u8 __tokencap_ro_loaded;
static FILE* __tokencap_out_file;
static int __tokencap_out_file = -1;
/* Identify read-only regions in memory. Only parameters that fall into these
ranges are worth dumping when passed to strcmp() and so on. Read-write
@ -211,7 +212,7 @@ static void __tokencap_dump(const u8* ptr, size_t len, u8 is_text) {
u32 i;
u32 pos = 0;
if (len < MIN_AUTO_EXTRA || len > MAX_AUTO_EXTRA || !__tokencap_out_file)
if (len < MIN_AUTO_EXTRA || len > MAX_AUTO_EXTRA || __tokencap_out_file == -1)
return;
for (i = 0; i < len; i++) {
@ -237,7 +238,9 @@ static void __tokencap_dump(const u8* ptr, size_t len, u8 is_text) {
buf[pos] = 0;
fprintf(__tokencap_out_file, "\"%s\"\n", buf);
write(__tokencap_out_file, "\"", 1);
write(__tokencap_out_file, buf, pos);
write(__tokencap_out_file, "\"\n", 2);
}
@ -403,8 +406,13 @@ char* strcasestr(const char* haystack, const char* needle) {
__attribute__((constructor)) void __tokencap_init(void) {
u8* fn = getenv("AFL_TOKEN_FILE");
if (fn) __tokencap_out_file = fopen(fn, "a");
if (!__tokencap_out_file) __tokencap_out_file = stderr;
if (fn) __tokencap_out_file = open(fn, O_RDWR | O_CREAT | O_APPEND, 0655);
if (__tokencap_out_file == -1) __tokencap_out_file = STDERR_FILENO;
}
/* closing as best as we can the tokens file */
__attribute__((destructor)) void __tokencap_shutdown(void) {
if (__tokencap_out_file != STDERR_FILENO) close(__tokencap_out_file);
}