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Fix fuzzing stderr override on os x

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This commit is contained in:
Matt Johnston 2020-10-26 23:44:43 +08:00
parent bf4058d1df
commit 1b603069db
2 changed files with 17 additions and 6 deletions
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10
fuzz.h
View File

@ -74,18 +74,24 @@ struct dropbear_fuzz_options {
int recv_dumpfd;
// avoid filling fuzzing logs, this points to /dev/null
FILE *stderr;
FILE *fake_stderr;
};
extern struct dropbear_fuzz_options fuzz;
/* guard for when fuzz.h is included by fuzz-common.c */
#ifndef FUZZ_NO_REPLACE_STDERR
/* This is a bodge but seems to work.
glibc stdio.h has the comment
"C89/C99 say they're macros. Make them happy." */
/* OS X has it as a macro */
#ifdef stderr
#undef stderr
#endif
#define stderr (fuzz.stderr)
#define stderr (fuzz.fake_stderr)
#endif /* FUZZ_NO_REPLACE_STDERR */
#endif // DROPBEAR_FUZZ

13
fuzz/fuzz-common.c
View File

@ -1,7 +1,6 @@
#include "includes.h"
#include "includes.h"
#include "fuzz.h"
#include "dbutil.h"
#include "runopts.h"
#include "crypto_desc.h"
@ -11,8 +10,14 @@
#include "atomicio.h"
#include "fuzz-wrapfd.h"
#define FUZZ_NO_REPLACE_STDERR
#include "fuzz.h"
/* fuzz.h redefines stderr, we don't want that here */
#ifdef origstderr
#undef stderr
#define stderr origstderr
#endif // origstderr
struct dropbear_fuzz_options fuzz;
@ -23,7 +28,7 @@ static void load_fixed_client_key(void);
// This runs automatically before main, due to contructor attribute in fuzz.h
void fuzz_early_setup(void) {
/* Set stderr to point to normal stderr by default */
fuzz.stderr = stderr;
fuzz.fake_stderr = stderr;
}
void fuzz_common_setup(void) {
@ -50,8 +55,8 @@ void fuzz_common_setup(void) {
else
{
fprintf(stderr, "Dropbear fuzzer: Disabling stderr output\n");
fuzz.stderr = fopen("/dev/null", "w");
assert(fuzz.stderr);
fuzz.fake_stderr = fopen("/dev/null", "w");
assert(fuzz.fake_stderr);
}
}