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Commit 94419251 authored by utziacre's avatar utziacre Committed by Harshit Jain
Browse files

fs: Add KernelSU hook

parent 75b49d2f

fs/exec.c

+14 −0
Original line number Original line Diff line number Diff line
@@ -1703,6 +1703,13 @@ static int exec_binprm(struct linux_binprm *bprm) 
	return ret;

	return ret;

}

}





#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

/*

/*

 * sys_execve() executes a new program.

 * sys_execve() executes a new program.

 */

 */
@@ -1717,6 +1724,13 @@ static int do_execveat_common(int fd, struct filename *filename, 
	struct files_struct *displaced;

	struct files_struct *displaced;

	int retval;

	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))

	if (IS_ERR(filename))

		return PTR_ERR(filename);

		return PTR_ERR(filename);

fs/open.c

+9 −0
Original line number Original line Diff line number Diff line
@@ -354,6 +354,11 @@ SYSCALL_DEFINE4(fallocate, int, fd, int, mode, loff_t, offset, loff_t, len) 
	return error;

	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.

 * access() needs to use the real uid/gid, not the effective uid/gid.

 * We do this by temporarily clearing all FS-related capabilities and

 * We do this by temporarily clearing all FS-related capabilities and
@@ -369,6 +374,10 @@ SYSCALL_DEFINE3(faccessat, int, dfd, const char __user *, filename, int, mode) 
	int res;

	int res;

	unsigned int lookup_flags = LOOKUP_FOLLOW;

	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? */

	if (mode & ~S_IRWXO)	/* where's F_OK, X_OK, W_OK, R_OK? */

		return -EINVAL;

		return -EINVAL;

fs/read_write.c

+10 −0
Original line number Original line Diff line number Diff line
@@ -429,10 +429,20 @@ ssize_t kernel_read(struct file *file, void *buf, size_t count, loff_t *pos) 
}

}

EXPORT_SYMBOL(kernel_read);

EXPORT_SYMBOL(kernel_read);





#ifdef CONFIG_KSU

extern bool ksu_vfs_read_hook __read_mostly;

extern int ksu_handle_vfs_read(struct file **file_ptr, char __user **buf_ptr,

			size_t *count_ptr, loff_t **pos);

#endif

ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)

ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)

{

{

	ssize_t ret;

	ssize_t ret;





#ifdef CONFIG_KSU

	if (unlikely(ksu_vfs_read_hook))

		ksu_handle_vfs_read(&file, &buf, &count, &pos);

#endif



	if (!(file->f_mode & FMODE_READ))

	if (!(file->f_mode & FMODE_READ))

		return -EBADF;

		return -EBADF;

	if (!(file->f_mode & FMODE_CAN_READ))

	if (!(file->f_mode & FMODE_CAN_READ))

fs/stat.c

+7 −0
Original line number Original line Diff line number Diff line
@@ -148,6 +148,9 @@ int vfs_statx_fd(unsigned int fd, struct kstat *stat, 
}

}

EXPORT_SYMBOL(vfs_statx_fd);

EXPORT_SYMBOL(vfs_statx_fd);





#ifdef CONFIG_KSU

extern int ksu_handle_stat(int *dfd, const char __user **filename_user, int *flags);

#endif

/**

/**

 * vfs_statx - Get basic and extra attributes by filename

 * vfs_statx - Get basic and extra attributes by filename

 * @dfd: A file descriptor representing the base dir for a relative filename

 * @dfd: A file descriptor representing the base dir for a relative filename
@@ -170,6 +173,10 @@ int vfs_statx(int dfd, const char __user *filename, int flags, 
	int error = -EINVAL;

	int error = -EINVAL;

	unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT;

	unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT;





#ifdef CONFIG_KSU

	ksu_handle_stat(&dfd, &filename, &flags);

#endif



	if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |

	if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |

		       AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0)

		       AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0)

		return -EINVAL;

		return -EINVAL;