#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
-#include <string.h>
+#include <libgen.h>
#include <syslog.h>
+#include <limits.h>
#ifndef PTRACE_EVENT_STOP
/* PTRACE_EVENT_STOP is defined in linux/ptrace.h, but this header
#define PTRACE_EVENT_STOP 128
#endif
+#ifndef PTRACE_EVENT_SECCOMP
+/* undefined with uClibc-ng */
+#define PTRACE_EVENT_SECCOMP 7
+#endif
+
#include <libubox/ulog.h>
#include <libubox/uloop.h>
#include <libubox/blobmsg.h>
#define _offsetof(a, b) __builtin_offsetof(a,b)
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
-#ifdef __amd64__
+#if defined (__aarch64__)
+#include <linux/ptrace.h>
+#elif defined(__amd64__)
#define reg_syscall_nr _offsetof(struct user, regs.orig_rax)
+#elif defined(__arm__)
+#include <asm/ptrace.h> /* for PTRACE_SET_SYSCALL */
+#define reg_syscall_nr _offsetof(struct user, regs.uregs[7])
+# if defined(__ARM_EABI__)
+# define reg_retval_nr _offsetof(struct user, regs.uregs[0])
+# endif
#elif defined(__i386__)
#define reg_syscall_nr _offsetof(struct user, regs.orig_eax)
#elif defined(__mips)
# define EF_REG2 8
# endif
#define reg_syscall_nr (EF_REG2 / 4)
-#elif defined(__arm__)
-#include <asm/ptrace.h> /* for PTRACE_SET_SYSCALL */
-#define reg_syscall_nr _offsetof(struct user, regs.uregs[7])
-# if defined(__ARM_EABI__)
-# define reg_retval_nr _offsetof(struct user, regs.uregs[0])
-# endif
+#elif defined(__PPC__)
+#define reg_syscall_nr _offsetof(struct user, regs.gpr[0])
+#define reg_retval_nr _offsetof(struct user, regs.gpr[3])
#else
#error tracing is not supported on this architecture
#endif
static void print_syscalls(int policy, const char *json)
{
- void *c;
+ void *c, *d, *e;
int i;
+ char *tmp;
if (mode == UTRACE) {
set_syscall("rt_sigaction", 1);
qsort(sorted, SYSCALL_COUNT, sizeof(sorted[0]), cmp_count);
blob_buf_init(&b, 0);
- c = blobmsg_open_array(&b, "whitelist");
+ blobmsg_add_string(&b, "defaultAction", "SCMP_ACT_KILL_PROCESS");
+ c = blobmsg_open_array(&b, "syscalls");
+ d = blobmsg_open_table(&b, "");
+ e = blobmsg_open_array(&b, "names");
for (i = 0; i < SYSCALL_COUNT; i++) {
int sc = sorted[i].syscall;
ULOG_ERR("no name found for syscall(%d)\n", sc);
}
}
+ blobmsg_close_array(&b, e);
+ blobmsg_add_string(&b, "action", "SCMP_ACT_ALLOW");
+ blobmsg_close_table(&b, d);
blobmsg_close_array(&b, c);
- blobmsg_add_u32(&b, "policy", policy);
if (json) {
FILE *fp = fopen(json, "w");
if (fp) {
- fprintf(fp, "%s", blobmsg_format_json_indent(b.head, true, 0));
+ tmp = blobmsg_format_json_indent(b.head, true, 0);
+ if (!tmp) {
+ fclose(fp);
+ return;
+ }
+
+ fprintf(fp, "%s\n", tmp);
+ free(tmp);
fclose(fp);
ULOG_INFO("saving syscall trace to %s\n", json);
} else {
ULOG_ERR("failed to open %s\n", json);
}
} else {
- printf("%s\n",
- blobmsg_format_json_indent(b.head, true, 0));
- }
+ tmp = blobmsg_format_json_indent(b.head, true, 0);
+ if (!tmp)
+ return;
+ printf("%s\n", tmp);
+ free(tmp);
+ }
}
static void report_seccomp_vialation(pid_t pid, unsigned syscall)
char buf[200];
snprintf(buf, sizeof(buf), "/proc/%d/cmdline", pid);
int f = open(buf, O_RDONLY);
+ if (f < 0)
+ return;
+
int r = read(f, buf, sizeof(buf) - 1);
+ buf[sizeof(buf) - 1] = '\0';
+
if (r >= 0)
buf[r] = 0;
else
if (WIFSTOPPED(ret) || (ret >> 16)) {
if (WSTOPSIG(ret) & 0x80) {
if (!tracee->in_syscall) {
+#ifdef __aarch64__
+ int syscall = -1;
+ struct ptrace_syscall_info ptsi = {.op=PTRACE_SYSCALL_INFO_ENTRY};
+ if (ptrace(PTRACE_GET_SYSCALL_INFO, c->pid, sizeof(ptsi), &ptsi) != -1)
+ syscall = ptsi.entry.nr;
+#else
int syscall = ptrace(PTRACE_PEEKUSER, c->pid, reg_syscall_nr);
+#endif
int i = syscall_index(syscall);
if (i >= 0) {
syscall_count[i]++;
(ret >> 8) == (SIGTRAP | (PTRACE_EVENT_CLONE << 8))) {
struct tracee *child = calloc(1, sizeof(struct tracee));
- ptrace(PTRACE_GETEVENTMSG, c->pid, 0, &child->proc.pid);
+ unsigned long msg;
+ ptrace(PTRACE_GETEVENTMSG, c->pid, 0, &msg);
+ child->proc.pid = msg;
child->proc.cb = tracer_cb;
ptrace(ptrace_restart, child->proc.pid, 0, 0);
uloop_process_add(&child->proc);
} else if ((ret >> 16) == PTRACE_EVENT_STOP) {
/* Nothing special to do here */
} else if ((ret >> 8) == (SIGTRAP | (PTRACE_EVENT_SECCOMP << 8))) {
+#ifdef __aarch64__
+ int syscall = -1;
+ struct ptrace_syscall_info ptsi = {.op=PTRACE_SYSCALL_INFO_SECCOMP};
+ if (ptrace(PTRACE_GET_SYSCALL_INFO, c->pid, sizeof(ptsi), &ptsi) != -1)
+ syscall = ptsi.entry.nr;
+#else
int syscall = ptrace(PTRACE_PEEKUSER, c->pid, reg_syscall_nr);
#if defined(__arm__)
ptrace(PTRACE_SET_SYSCALL, c->pid, 0, -1);
ptrace(PTRACE_POKEUSER, c->pid, reg_retval_nr, -ENOSYS);
#else
ptrace(PTRACE_POKEUSER, c->pid, reg_syscall_nr, -1);
+#endif
#endif
report_seccomp_vialation(c->pid, syscall);
} else {
case SECCOMP_TRACE:
preload = "/lib/libpreload-seccomp.so";
newenv = 2;
- asprintf(&_envp[1], "SECCOMP_FILE=%s", json ? json : "");
+ if (asprintf(&_envp[1], "SECCOMP_FILE=%s", json ? json : "") < 0)
+ ULOG_ERR("failed to allocate SECCOMP_FILE env: %m\n");
+
kill(getpid(), SIGSTOP);
break;
}
- asprintf(&_envp[0], "LD_PRELOAD=%s%s%s", preload,
- old_preload ? ":" : "",
- old_preload ? old_preload : "");
+ if (asprintf(&_envp[0], "LD_PRELOAD=%s%s%s", preload,
+ old_preload ? ":" : "",
+ old_preload ? old_preload : "") < 0)
+ ULOG_ERR("failed to allocate LD_PRELOAD env: %m\n");
+
memcpy(&_envp[newenv], envp, envc * sizeof(char *));
ret = execve(_argv[0], _argv, _envp);
- ULOG_ERR("failed to exec %s: %s\n", _argv[0], strerror(errno));
+ ULOG_ERR("failed to exec %s: %m\n", _argv[0]);
free(_argv);
+ if (_envp[0])
+ free(_envp[0]);
+ if (newenv == 2 && _envp[1])
+ free(_envp[1]);
free(_envp);
return ret;
}
return -1;
}
+ /* Initialize uloop to catch all ptrace stops from now on. */
+ uloop_init();
+
int ptrace_options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACECLONE;
switch (mode) {
case UTRACE:
break;
}
if (ptrace(PTRACE_SEIZE, child, 0, ptrace_options) == -1) {
- ULOG_ERR("PTRACE_SEIZE: %s\n", strerror(errno));
+ ULOG_ERR("PTRACE_SEIZE: %m\n");
return -1;
}
if (ptrace(ptrace_restart, child, 0, SIGCONT) == -1) {
- ULOG_ERR("ptrace_restart: %s\n", strerror(errno));
+ ULOG_ERR("ptrace_restart: %m\n");
return -1;
}
- uloop_init();
tracer.proc.pid = child;
tracer.proc.cb = tracer_cb;
uloop_process_add(&tracer.proc);
case UTRACE:
if (!json)
if (asprintf(&json, "/tmp/%s.%u.json", basename(*argv), child) < 0)
- ULOG_ERR("failed to allocate output path: %s\n", strerror(errno));
+ ULOG_ERR("failed to allocate output path: %m\n");
break;
case SECCOMP_TRACE:
if (!violation_count)
return 0;
- asprintf(&json, "/tmp/%s.%u.violations.json", basename(*argv), child);
+ if (asprintf(&json, "/tmp/%s.%u.violations.json", basename(*argv), child) < 0)
+ ULOG_ERR("failed to allocate violations output path: %m\n");
break;
}
print_syscalls(policy, json);
projects / project / procd.git / blobdiff