mirror of
https://github.com/raspberrypi/linux.git
synced 2025-12-20 08:42:06 +00:00
d1d7f01f7c
Mark read-only data actually read-only (simple mprotect), and to be able to test it also implement _nofault accesses. This works by setting up a new "segv_continue" pointer in current, and then when we hit a segfault we change the signal return context so that we continue at that address. The code using this sets it up so that it jumps to a label and then aborts the access that way, returning -EFAULT. It's possible to optimize the ___backtrack_faulted() thing by using asm goto (compiler version dependent) and/or gcc's (not sure if clang has it) &&label extension, but at least in one attempt I made the && caused the compiler to not load -EFAULT into the register in case of jumping to the &&label from the fault handler. So leave it like this for now. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Co-developed-by: Benjamin Berg <benjamin.berg@intel.com> Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20250210160926.420133-2-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
26 lines
547 B
C
26 lines
547 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
*/
|
|
|
|
#ifndef __IRQ_USER_H__
|
|
#define __IRQ_USER_H__
|
|
|
|
#include <sysdep/ptrace.h>
|
|
|
|
enum um_irq_type {
|
|
IRQ_READ,
|
|
IRQ_WRITE,
|
|
NUM_IRQ_TYPES,
|
|
};
|
|
|
|
struct siginfo;
|
|
extern void sigio_handler(int sig, struct siginfo *unused_si,
|
|
struct uml_pt_regs *regs, void *mc);
|
|
void sigio_run_timetravel_handlers(void);
|
|
extern void free_irq_by_fd(int fd);
|
|
extern void deactivate_fd(int fd, int irqnum);
|
|
extern int deactivate_all_fds(void);
|
|
|
|
#endif
|