mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-18 01:16:52 +07:00
6b6e177d63
Pull arch/tile updates from Chris Metcalf: "These are mostly nohz_full changes, plus a smattering of minor fixes (notably a couple for ftrace)" * git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile: tile: nohz: warn if nohz_full uses hypervisor shared cores tile: ftrace: fix function_graph tracer issues tile: map data region shadow of kernel as R/W tile: support CONTEXT_TRACKING and thus NOHZ_FULL tile: support arch_irq_work_raise arch: tile: fix null pointer dereference on pt_regs pointer tile/elf: reorganize notify_exec() tile: use si_int instead of si_ptr for compat_siginfo
249 lines
7.2 KiB
C
249 lines
7.2 KiB
C
/*
|
|
* Copyright 2010 Tilera Corporation. All Rights Reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation, version 2.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
|
* more details.
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/unistd.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/personality.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/ptrace.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/ucontext.h>
|
|
#include <asm/sigframe.h>
|
|
#include <asm/syscalls.h>
|
|
#include <asm/vdso.h>
|
|
#include <arch/interrupts.h>
|
|
|
|
struct compat_ucontext {
|
|
compat_ulong_t uc_flags;
|
|
compat_uptr_t uc_link;
|
|
struct compat_sigaltstack uc_stack;
|
|
struct sigcontext uc_mcontext;
|
|
sigset_t uc_sigmask; /* mask last for extensibility */
|
|
};
|
|
|
|
struct compat_rt_sigframe {
|
|
unsigned char save_area[C_ABI_SAVE_AREA_SIZE]; /* caller save area */
|
|
struct compat_siginfo info;
|
|
struct compat_ucontext uc;
|
|
};
|
|
|
|
int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from)
|
|
{
|
|
int err;
|
|
|
|
if (!access_ok(VERIFY_WRITE, to, sizeof(struct compat_siginfo)))
|
|
return -EFAULT;
|
|
|
|
/* If you change siginfo_t structure, please make sure that
|
|
this code is fixed accordingly.
|
|
It should never copy any pad contained in the structure
|
|
to avoid security leaks, but must copy the generic
|
|
3 ints plus the relevant union member. */
|
|
err = __put_user(from->si_signo, &to->si_signo);
|
|
err |= __put_user(from->si_errno, &to->si_errno);
|
|
err |= __put_user((short)from->si_code, &to->si_code);
|
|
|
|
if (from->si_code < 0) {
|
|
err |= __put_user(from->si_pid, &to->si_pid);
|
|
err |= __put_user(from->si_uid, &to->si_uid);
|
|
err |= __put_user(from->si_int, &to->si_int);
|
|
} else {
|
|
/*
|
|
* First 32bits of unions are always present:
|
|
* si_pid === si_band === si_tid === si_addr(LS half)
|
|
*/
|
|
err |= __put_user(from->_sifields._pad[0],
|
|
&to->_sifields._pad[0]);
|
|
switch (from->si_code >> 16) {
|
|
case __SI_FAULT >> 16:
|
|
break;
|
|
case __SI_CHLD >> 16:
|
|
err |= __put_user(from->si_utime, &to->si_utime);
|
|
err |= __put_user(from->si_stime, &to->si_stime);
|
|
err |= __put_user(from->si_status, &to->si_status);
|
|
/* FALL THROUGH */
|
|
default:
|
|
case __SI_KILL >> 16:
|
|
err |= __put_user(from->si_uid, &to->si_uid);
|
|
break;
|
|
case __SI_POLL >> 16:
|
|
err |= __put_user(from->si_fd, &to->si_fd);
|
|
break;
|
|
case __SI_TIMER >> 16:
|
|
err |= __put_user(from->si_overrun, &to->si_overrun);
|
|
err |= __put_user(from->si_int, &to->si_int);
|
|
break;
|
|
/* This is not generated by the kernel as of now. */
|
|
case __SI_RT >> 16:
|
|
case __SI_MESGQ >> 16:
|
|
err |= __put_user(from->si_uid, &to->si_uid);
|
|
err |= __put_user(from->si_int, &to->si_int);
|
|
break;
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
|
|
{
|
|
int err;
|
|
|
|
if (!access_ok(VERIFY_READ, from, sizeof(struct compat_siginfo)))
|
|
return -EFAULT;
|
|
|
|
memset(to, 0, sizeof(*to));
|
|
|
|
err = __get_user(to->si_signo, &from->si_signo);
|
|
err |= __get_user(to->si_errno, &from->si_errno);
|
|
err |= __get_user(to->si_code, &from->si_code);
|
|
|
|
err |= __get_user(to->si_pid, &from->si_pid);
|
|
err |= __get_user(to->si_uid, &from->si_uid);
|
|
err |= __get_user(to->si_int, &from->si_int);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* The assembly shim for this function arranges to ignore the return value. */
|
|
long compat_sys_rt_sigreturn(void)
|
|
{
|
|
struct pt_regs *regs = current_pt_regs();
|
|
struct compat_rt_sigframe __user *frame =
|
|
(struct compat_rt_sigframe __user *) compat_ptr(regs->sp);
|
|
sigset_t set;
|
|
|
|
if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
|
|
goto badframe;
|
|
if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
|
|
goto badframe;
|
|
|
|
set_current_blocked(&set);
|
|
|
|
if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
|
|
goto badframe;
|
|
|
|
if (compat_restore_altstack(&frame->uc.uc_stack))
|
|
goto badframe;
|
|
|
|
return 0;
|
|
|
|
badframe:
|
|
signal_fault("bad sigreturn frame", regs, frame, 0);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Determine which stack to use..
|
|
*/
|
|
static inline void __user *compat_get_sigframe(struct k_sigaction *ka,
|
|
struct pt_regs *regs,
|
|
size_t frame_size)
|
|
{
|
|
unsigned long sp;
|
|
|
|
/* Default to using normal stack */
|
|
sp = (unsigned long)compat_ptr(regs->sp);
|
|
|
|
/*
|
|
* If we are on the alternate signal stack and would overflow
|
|
* it, don't. Return an always-bogus address instead so we
|
|
* will die with SIGSEGV.
|
|
*/
|
|
if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
|
|
return (void __user __force *)-1UL;
|
|
|
|
/* This is the X/Open sanctioned signal stack switching. */
|
|
if (ka->sa.sa_flags & SA_ONSTACK) {
|
|
if (sas_ss_flags(sp) == 0)
|
|
sp = current->sas_ss_sp + current->sas_ss_size;
|
|
}
|
|
|
|
sp -= frame_size;
|
|
/*
|
|
* Align the stack pointer according to the TILE ABI,
|
|
* i.e. so that on function entry (sp & 15) == 0.
|
|
*/
|
|
sp &= -16UL;
|
|
return (void __user *) sp;
|
|
}
|
|
|
|
int compat_setup_rt_frame(struct ksignal *ksig, sigset_t *set,
|
|
struct pt_regs *regs)
|
|
{
|
|
unsigned long restorer;
|
|
struct compat_rt_sigframe __user *frame;
|
|
int err = 0, sig = ksig->sig;
|
|
|
|
frame = compat_get_sigframe(&ksig->ka, regs, sizeof(*frame));
|
|
|
|
if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
|
|
goto err;
|
|
|
|
/* Always write at least the signal number for the stack backtracer. */
|
|
if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
|
|
/* At sigreturn time, restore the callee-save registers too. */
|
|
err |= copy_siginfo_to_user32(&frame->info, &ksig->info);
|
|
regs->flags |= PT_FLAGS_RESTORE_REGS;
|
|
} else {
|
|
err |= __put_user(ksig->info.si_signo, &frame->info.si_signo);
|
|
}
|
|
|
|
/* Create the ucontext. */
|
|
err |= __clear_user(&frame->save_area, sizeof(frame->save_area));
|
|
err |= __put_user(0, &frame->uc.uc_flags);
|
|
err |= __put_user(0, &frame->uc.uc_link);
|
|
err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp);
|
|
err |= setup_sigcontext(&frame->uc.uc_mcontext, regs);
|
|
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
|
|
if (err)
|
|
goto err;
|
|
|
|
restorer = VDSO_SYM(&__vdso_rt_sigreturn);
|
|
if (ksig->ka.sa.sa_flags & SA_RESTORER)
|
|
restorer = ptr_to_compat_reg(ksig->ka.sa.sa_restorer);
|
|
|
|
/*
|
|
* Set up registers for signal handler.
|
|
* Registers that we don't modify keep the value they had from
|
|
* user-space at the time we took the signal.
|
|
* We always pass siginfo and mcontext, regardless of SA_SIGINFO,
|
|
* since some things rely on this (e.g. glibc's debug/segfault.c).
|
|
*/
|
|
regs->pc = ptr_to_compat_reg(ksig->ka.sa.sa_handler);
|
|
regs->ex1 = PL_ICS_EX1(USER_PL, 1); /* set crit sec in handler */
|
|
regs->sp = ptr_to_compat_reg(frame);
|
|
regs->lr = restorer;
|
|
regs->regs[0] = (unsigned long) sig;
|
|
regs->regs[1] = ptr_to_compat_reg(&frame->info);
|
|
regs->regs[2] = ptr_to_compat_reg(&frame->uc);
|
|
regs->flags |= PT_FLAGS_CALLER_SAVES;
|
|
return 0;
|
|
|
|
err:
|
|
trace_unhandled_signal("bad sigreturn frame", regs,
|
|
(unsigned long)frame, SIGSEGV);
|
|
return -EFAULT;
|
|
}
|