gtaxlve - sm-p619

[MatejMagat305]

according tutorial I was tryed find do_execveat_common and others, but it seems like diference from tutorial, I not found do_faccessat ......

static int do_execveat_common(int fd, struct filename *filename,
			      struct user_arg_ptr argv,
			      struct user_arg_ptr envp,
			      int flags)
{
	char *pathbuf = NULL;
	struct linux_binprm *bprm;
	struct file *file;
	struct files_struct *displaced;
	int retval;

	if (IS_ERR(filename))
		return PTR_ERR(filename);
....
	/*

what I should do? anstwer: nothing is ansver too

[addas]

Here is the way

 * sys_execve() executes a new program.
 */

#ifdef CONFIG_KSU
extern bool ksu_execveat_hook __read_mostly;
extern int ksu_handle_execveat(int *fd, struct filename **filename_ptr, void *argv,
			void *envp, int *flags);
extern int ksu_handle_execveat_sucompat(int *fd, struct filename **filename_ptr,
				 void *argv, void *envp, int *flags);
#endif

static int do_execveat_common(int fd, struct filename *filename,
			      struct user_arg_ptr argv,
			      struct user_arg_ptr envp,
			      int flags)
{
	char *pathbuf = NULL;
	struct linux_binprm *bprm;
	struct file *file;
	struct files_struct *displaced;
	int retval;
	
	#ifdef CONFIG_KSU
	if (unlikely(ksu_execveat_hook))
		ksu_handle_execveat(&fd, &filename, &argv, &envp, &flags);
	else
		ksu_handle_execveat_sucompat(&fd, &filename, &argv, &envp, &flags);
	#endif

	if (IS_ERR(filename))
		return PTR_ERR(filename);

	/*

[MatejMagat305]

ok, thank, but others funkcions such as do_faccessat I not found ...

[addas]

As per the guide, some older kernel have faccessat instead, here is for open.c

SYSCALL_DEFINE4(fallocate, int, fd, int, mode, loff_t, offset, loff_t, len)
{
	struct fd f = fdget(fd);
	int error = -EBADF;

	if (f.file) {
		error = vfs_fallocate(f.file, mode, offset, len);
		fdput(f);
	}
	return error;
}

#ifdef CONFIG_KSU
extern int ksu_handle_faccessat(int *dfd, const char __user **filename_user, int *mode,
			int *flags);
#endif

/*
 * access() needs to use the real uid/gid, not the effective uid/gid.
 * We do this by temporarily clearing all FS-related capabilities and
 * switching the fsuid/fsgid around to the real ones.
 */
SYSCALL_DEFINE3(faccessat, int, dfd, const char __user *, filename, int, mode)
{
	const struct cred *old_cred;
	struct cred *override_cred;
	struct path path;
	struct inode *inode;
	struct vfsmount *mnt;
	int res;
	unsigned int lookup_flags = LOOKUP_FOLLOW;
	
	#ifdef CONFIG_KSU
	ksu_handle_faccessat(&dfd, &filename, &mode, NULL);
	#endif
	
	if (mode & ~S_IRWXO)	/* where's F_OK, X_OK, W_OK, R_OK? */
		return -EINVAL;

[MatejMagat305]

ou, sorry, thank