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fuzz: wrap kill()

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This commit is contained in:
Matt Johnston 2021-01-29 21:47:56 +08:00
parent 49177312fb
commit e8640bdca3
4 changed files with 19 additions and 0 deletions
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2
fuzz-wrapfd.h
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@ -1,6 +1,7 @@
#ifndef FUZZ_WRAPFD_H #ifndef FUZZ_WRAPFD_H
#define FUZZ_WRAPFD_H #define FUZZ_WRAPFD_H
#include "includes.h"
#include "buffer.h" #include "buffer.h"
enum wrapfd_mode { enum wrapfd_mode {
@ -21,5 +22,6 @@ int wrapfd_write(int fd, const void* in, size_t count);
int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds, int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds,
fd_set *exceptfds, struct timeval *timeout); fd_set *exceptfds, struct timeval *timeout);
int wrapfd_close(int fd); int wrapfd_close(int fd);
int fuzz_kill(pid_t pid, int sig);
#endif // FUZZ_WRAPFD_H #endif // FUZZ_WRAPFD_H

1
fuzz.h
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@ -59,6 +59,7 @@ void fuzz_dump(const unsigned char* data, size_t len);
#define write(fd, buf, count) wrapfd_write(fd, buf, count) #define write(fd, buf, count) wrapfd_write(fd, buf, count)
#define read(fd, buf, count) wrapfd_read(fd, buf, count) #define read(fd, buf, count) wrapfd_read(fd, buf, count)
#define close(fd) wrapfd_close(fd) #define close(fd) wrapfd_close(fd)
#define kill(pid, sig) fuzz_kill(pid, sig)
#endif // FUZZ_SKIP_WRAP #endif // FUZZ_SKIP_WRAP
struct dropbear_fuzz_options { struct dropbear_fuzz_options {

12
fuzz/fuzz-wrapfd.c
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@ -258,3 +258,15 @@ int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds,
return ret; return ret;
} }
int fuzz_kill(pid_t pid, int sig) {
if (fuzz.fuzzing) {
TRACE(("fuzz_kill ignoring pid %d signal %d", (pid), sig))
if (sig >= 0) {
return 0;
} else {
errno = EINVAL;
return -1;
}
}
return kill(pid, sig);
}

4
svr-chansession.c
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@ -423,12 +423,14 @@ out:
/* Send a signal to a session's process as requested by the client*/ /* Send a signal to a session's process as requested by the client*/
static int sessionsignal(const struct ChanSess *chansess) { static int sessionsignal(const struct ChanSess *chansess) {
TRACE(("sessionsignal"))
int sig = 0; int sig = 0;
char* signame = NULL; char* signame = NULL;
int i; int i;
if (chansess->pid == 0) { if (chansess->pid == 0) {
TRACE(("sessionsignal: done no pid"))
/* haven't got a process pid yet */ /* haven't got a process pid yet */
return DROPBEAR_FAILURE; return DROPBEAR_FAILURE;
} }
@ -446,12 +448,14 @@ static int sessionsignal(const struct ChanSess *chansess) {
m_free(signame); m_free(signame);
TRACE(("sessionsignal: pid %d signal %d", (int)chansess->pid, sig))
if (sig == 0) { if (sig == 0) {
/* failed */ /* failed */
return DROPBEAR_FAILURE; return DROPBEAR_FAILURE;
} }
if (kill(chansess->pid, sig) < 0) { if (kill(chansess->pid, sig) < 0) {
TRACE(("sessionsignal: kill() errored"))
return DROPBEAR_FAILURE; return DROPBEAR_FAILURE;
} }