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/* ioctl_trace.c - log the NVIDIA driver ioctls of a child process.
*
* libcuda issues raw syscall instructions, so LD_PRELOAD/ltrace never see
* them; ptrace does. Logs every ioctl whose request has the NVIDIA 'F' magic
* (0xc03046xx / 0xc01846xx / ...) with its arguments and return value, so the
* last driver call before a crash is visible.
*
* Build (guest): gcc -O1 -w -o /tmp/iot ioctl_trace.c
* Run: /tmp/iot /tmp/cdt
*/
#define _GNU_SOURCE
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/ptrace.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#define SYS_IOCTL_X86_64 16
/* Read memory from the traced child. */
static int read_child(pid_t pid, unsigned long addr, void *buf, size_t len)
{
size_t done = 0;
unsigned char *p = buf;
while (done < len) {
long word = ptrace(PTRACE_PEEKDATA, pid, addr + done, 0);
if (word == -1 && errno)
return -1;
memcpy(p + done, &word, sizeof(word) < len - done ?
sizeof(word) : len - done);
done += sizeof(word);
}
return 0;
}
static void dump_alloc(pid_t pid, unsigned long arg)
{
unsigned int v[12];
if (read_child(pid, arg, v, sizeof(v)))
return;
/* NVOS21_PARAMETERS: hRoot, hObjectParent, hObjectNew, hClass,
* pAllocParms, pRightsRequested, paramsSize, flags, status */
fprintf(stderr,
"[iot] alloc root=0x%x parent=0x%x new=0x%x class=0x%x params=%u flags=0x%x\n",
v[0], v[1], v[2], v[3], v[6], v[7]);
}
static void dump_control(pid_t pid, unsigned long arg)
{
unsigned int v[8];
unsigned long long pParams;
unsigned int cmd;
if (read_child(pid, arg, v, sizeof(v)))
return;
/* NVOS54_PARAMETERS: hClient, hObject, cmd, flags, params, paramsSize, ... */
cmd = v[2];
memcpy(&pParams, &v[4], sizeof(pParams));
fprintf(stderr,
"[iot] control client=0x%x object=0x%x cmd=0x%x params=0x%llx size=%u\n",
v[0], v[1], cmd, pParams, v[5]);
}
int main(int argc, char **argv)
{
pid_t pid;
int status;
unsigned long long nr = 0, a0 = 0, a1 = 0, a2 = 0, a3 = 0;
int entry_args_valid = 0;
if (argc < 2) {
fprintf(stderr, "usage: %s <prog> [args...]\n", argv[0]);
return 1;
}
pid = fork();
if (pid == 0) {
ptrace(PTRACE_TRACEME, 0, 0, 0);
raise(SIGSTOP);
execv(argv[1], &argv[1]);
perror("execv");
_exit(127);
}
waitpid(pid, &status, 0);
ptrace(PTRACE_SETOPTIONS, pid, 0, PTRACE_O_TRACESYSGOOD);
ptrace(PTRACE_SYSCALL, pid, 0, 0);
while (1) {
if (waitpid(pid, &status, 0) < 0)
break;
if (WIFEXITED(status)) {
fprintf(stderr, "[iot] child exited rc=%d\n",
WEXITSTATUS(status));
break;
}
if (WIFSIGNALED(status)) {
fprintf(stderr, "[iot] child killed by signal %d\n",
WTERMSIG(status));
break;
}
if (!WIFSTOPPED(status))
continue;
if (WSTOPSIG(status) != (SIGTRAP | 0x80))
goto cont;
if (!entry_args_valid) {
/* syscall entry */
struct user_regs_struct {
unsigned long long r15, r14, r13, r12, rbp,
rbx, r11, r10, r9, r8, rax, rcx,
rdx, rsi, rdi, orig_rax, rip, cs,
eflags, rsp, ss;
} regs;
if (ptrace(PTRACE_GETREGS, pid, 0, ®s) == 0 &&
regs.orig_rax == SYS_IOCTL_X86_64) {
nr = regs.orig_rax;
a0 = regs.rdi;
a1 = regs.rsi;
a2 = regs.rdx;
a3 = regs.r10;
entry_args_valid = 1;
}
} else {
/* syscall exit */
struct user_regs_struct {
unsigned long long r15, r14, r13, r12, rbp,
rbx, r11, r10, r9, r8, rax, rcx,
rdx, rsi, rdi, orig_rax, rip, cs,
eflags, rsp, ss;
} regs;
if (entry_args_valid &&
ptrace(PTRACE_GETREGS, pid, 0, ®s) == 0) {
unsigned long long req = a1;
unsigned long long ret =
(unsigned long long)regs.rax;
if (((req >> 8) & 0xff) == 0x46) {
fprintf(stderr,
"[iot] req=0x%llx arg=0x%llx ret=0x%llx\n",
req, a2, ret);
if (req == 0xc030462bULL)
dump_alloc(pid, a2);
else if ((req & 0xff) == 0x2a)
dump_control(pid, a2);
}
}
entry_args_valid = 0;
(void)nr; (void)a0; (void)a3;
}
cont:
ptrace(PTRACE_SYSCALL, pid, 0, 0);
}
return 0;
}
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