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Fuzzer mods #328

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merged 2 commits into from
Dec 17, 2024
Merged

Fuzzer mods #328

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785678f
fuzz: defend against read(fd, NULL, size) and read(-1, buf, size)
dacav Dec 16, 2024
a6e50d0
fuzz: Fix compiler warnings
dacav Dec 16, 2024
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2 changes: 2 additions & 0 deletions fuzz/fuzz_auth.c
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Original file line number Diff line number Diff line change
Expand Up @@ -164,6 +164,8 @@ static void consume(const void *body, size_t len) {

while (len--)
x ^= *ptr++;

(void) x;
}

static int conv_cb(int num_msg, const struct pam_message **msg,
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13 changes: 11 additions & 2 deletions fuzz/wrap.c
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Expand Up @@ -15,6 +15,7 @@
#include <openssl/ec.h>
#include <fido.h>

#include "debug.h"
#include "drop_privs.h"
#include "fuzz/fuzz.h"

Expand Down Expand Up @@ -65,7 +66,6 @@ WRAP(int, gethostname, (char *name, size_t len), -1, (name, len))
WRAP(ssize_t, getline, (char **s, size_t *n, FILE *fp), -1, (s, n, fp))
WRAP(FILE *, fdopen, (int fd, const char *mode), NULL, (fd, mode))
WRAP(int, fstat, (int fd, struct stat *st), -1, (fd, st))
WRAP(ssize_t, read, (int fd, void *buf, size_t count), -1, (fd, buf, count))
WRAP(BIO *, BIO_new, (const BIO_METHOD *type), NULL, (type))
WRAP(int, BIO_write, (BIO * b, const void *data, int len), -1, (b, data, len))
WRAP(int, BIO_read, (BIO * b, void *data, int len), -1, (b, data, len))
Expand All @@ -75,7 +75,16 @@ WRAP(BIO *, BIO_new_mem_buf, (const void *buf, int len), NULL, (buf, len))
WRAP(EC_KEY *, EC_KEY_new_by_curve_name, (int nid), NULL, (nid))
WRAP(const EC_GROUP *, EC_KEY_get0_group, (const EC_KEY *key), NULL, (key))

extern int __wrap_asprintf(char **strp, const char *fmt, ...);
extern ssize_t __real_read(int fildes, void *buf, size_t nbyte);
extern ssize_t __wrap_read(int fildes, void *buf, size_t nbyte);
extern ssize_t __wrap_read(int fildes, void *buf, size_t nbyte) {
assert(fildes >= 0);
assert(buf != NULL);
return __real_read(fildes, buf, nbyte);
}

extern int __wrap_asprintf(char **strp, const char *fmt, ...)
ATTRIBUTE_FORMAT(printf, 2, 3);
extern int __wrap_asprintf(char **strp, const char *fmt, ...) {
va_list ap;
int r;
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