mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-11-03 01:25:36 +01:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
256
arch/tile/kernel/compat_signal.c
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256
arch/tile/kernel/compat_signal.c
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/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/kernel.h>
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#include <linux/signal.h>
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#include <linux/errno.h>
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#include <linux/wait.h>
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#include <linux/unistd.h>
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#include <linux/stddef.h>
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#include <linux/personality.h>
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#include <linux/suspend.h>
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#include <linux/ptrace.h>
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#include <linux/elf.h>
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#include <linux/compat.h>
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#include <linux/syscalls.h>
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#include <linux/uaccess.h>
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#include <asm/processor.h>
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#include <asm/ucontext.h>
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#include <asm/sigframe.h>
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#include <asm/syscalls.h>
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#include <asm/vdso.h>
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#include <arch/interrupts.h>
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struct compat_ucontext {
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compat_ulong_t uc_flags;
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compat_uptr_t uc_link;
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struct compat_sigaltstack uc_stack;
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struct sigcontext uc_mcontext;
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sigset_t uc_sigmask; /* mask last for extensibility */
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};
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struct compat_rt_sigframe {
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unsigned char save_area[C_ABI_SAVE_AREA_SIZE]; /* caller save area */
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struct compat_siginfo info;
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struct compat_ucontext uc;
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};
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int copy_siginfo_to_user32(struct compat_siginfo __user *to, const siginfo_t *from)
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{
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int err;
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if (!access_ok(VERIFY_WRITE, to, sizeof(struct compat_siginfo)))
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return -EFAULT;
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/* If you change siginfo_t structure, please make sure that
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this code is fixed accordingly.
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It should never copy any pad contained in the structure
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to avoid security leaks, but must copy the generic
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3 ints plus the relevant union member. */
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err = __put_user(from->si_signo, &to->si_signo);
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err |= __put_user(from->si_errno, &to->si_errno);
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err |= __put_user((short)from->si_code, &to->si_code);
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if (from->si_code < 0) {
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err |= __put_user(from->si_pid, &to->si_pid);
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err |= __put_user(from->si_uid, &to->si_uid);
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err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr);
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} else {
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/*
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* First 32bits of unions are always present:
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* si_pid === si_band === si_tid === si_addr(LS half)
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*/
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err |= __put_user(from->_sifields._pad[0],
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&to->_sifields._pad[0]);
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switch (from->si_code >> 16) {
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case __SI_FAULT >> 16:
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break;
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case __SI_CHLD >> 16:
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err |= __put_user(from->si_utime, &to->si_utime);
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err |= __put_user(from->si_stime, &to->si_stime);
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err |= __put_user(from->si_status, &to->si_status);
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/* FALL THROUGH */
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default:
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case __SI_KILL >> 16:
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err |= __put_user(from->si_uid, &to->si_uid);
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break;
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case __SI_POLL >> 16:
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err |= __put_user(from->si_fd, &to->si_fd);
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break;
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case __SI_TIMER >> 16:
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err |= __put_user(from->si_overrun, &to->si_overrun);
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err |= __put_user(ptr_to_compat(from->si_ptr),
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&to->si_ptr);
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break;
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/* This is not generated by the kernel as of now. */
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case __SI_RT >> 16:
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case __SI_MESGQ >> 16:
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err |= __put_user(from->si_uid, &to->si_uid);
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err |= __put_user(from->si_int, &to->si_int);
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break;
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}
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}
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return err;
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}
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int copy_siginfo_from_user32(siginfo_t *to, struct compat_siginfo __user *from)
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{
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int err;
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u32 ptr32;
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if (!access_ok(VERIFY_READ, from, sizeof(struct compat_siginfo)))
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return -EFAULT;
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err = __get_user(to->si_signo, &from->si_signo);
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err |= __get_user(to->si_errno, &from->si_errno);
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err |= __get_user(to->si_code, &from->si_code);
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err |= __get_user(to->si_pid, &from->si_pid);
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err |= __get_user(to->si_uid, &from->si_uid);
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err |= __get_user(ptr32, &from->si_ptr);
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to->si_ptr = compat_ptr(ptr32);
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return err;
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}
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/* The assembly shim for this function arranges to ignore the return value. */
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long compat_sys_rt_sigreturn(void)
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{
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struct pt_regs *regs = current_pt_regs();
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struct compat_rt_sigframe __user *frame =
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(struct compat_rt_sigframe __user *) compat_ptr(regs->sp);
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sigset_t set;
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if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
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goto badframe;
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if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
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goto badframe;
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set_current_blocked(&set);
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if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
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goto badframe;
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if (compat_restore_altstack(&frame->uc.uc_stack))
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goto badframe;
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return 0;
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badframe:
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signal_fault("bad sigreturn frame", regs, frame, 0);
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return 0;
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}
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/*
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* Determine which stack to use..
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*/
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static inline void __user *compat_get_sigframe(struct k_sigaction *ka,
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struct pt_regs *regs,
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size_t frame_size)
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{
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unsigned long sp;
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/* Default to using normal stack */
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sp = (unsigned long)compat_ptr(regs->sp);
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/*
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* If we are on the alternate signal stack and would overflow
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* it, don't. Return an always-bogus address instead so we
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* will die with SIGSEGV.
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*/
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if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
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return (void __user __force *)-1UL;
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/* This is the X/Open sanctioned signal stack switching. */
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if (ka->sa.sa_flags & SA_ONSTACK) {
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if (sas_ss_flags(sp) == 0)
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sp = current->sas_ss_sp + current->sas_ss_size;
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}
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sp -= frame_size;
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/*
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* Align the stack pointer according to the TILE ABI,
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* i.e. so that on function entry (sp & 15) == 0.
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*/
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sp &= -16UL;
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return (void __user *) sp;
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}
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int compat_setup_rt_frame(struct ksignal *ksig, sigset_t *set,
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struct pt_regs *regs)
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{
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unsigned long restorer;
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struct compat_rt_sigframe __user *frame;
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int err = 0, sig = ksig->sig;
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int usig;
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frame = compat_get_sigframe(&ksig->ka, regs, sizeof(*frame));
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if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
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goto err;
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usig = current_thread_info()->exec_domain
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&& current_thread_info()->exec_domain->signal_invmap
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&& sig < 32
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? current_thread_info()->exec_domain->signal_invmap[sig]
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: sig;
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/* Always write at least the signal number for the stack backtracer. */
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if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
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/* At sigreturn time, restore the callee-save registers too. */
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err |= copy_siginfo_to_user32(&frame->info, &ksig->info);
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regs->flags |= PT_FLAGS_RESTORE_REGS;
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} else {
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err |= __put_user(ksig->info.si_signo, &frame->info.si_signo);
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}
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/* Create the ucontext. */
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err |= __clear_user(&frame->save_area, sizeof(frame->save_area));
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err |= __put_user(0, &frame->uc.uc_flags);
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err |= __put_user(0, &frame->uc.uc_link);
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err |= __compat_save_altstack(&frame->uc.uc_stack, regs->sp);
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err |= setup_sigcontext(&frame->uc.uc_mcontext, regs);
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err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
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if (err)
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goto err;
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restorer = VDSO_SYM(&__vdso_rt_sigreturn);
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if (ksig->ka.sa.sa_flags & SA_RESTORER)
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restorer = ptr_to_compat_reg(ksig->ka.sa.sa_restorer);
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/*
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* Set up registers for signal handler.
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* Registers that we don't modify keep the value they had from
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* user-space at the time we took the signal.
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* We always pass siginfo and mcontext, regardless of SA_SIGINFO,
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* since some things rely on this (e.g. glibc's debug/segfault.c).
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*/
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regs->pc = ptr_to_compat_reg(ksig->ka.sa.sa_handler);
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regs->ex1 = PL_ICS_EX1(USER_PL, 1); /* set crit sec in handler */
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regs->sp = ptr_to_compat_reg(frame);
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regs->lr = restorer;
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regs->regs[0] = (unsigned long) usig;
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regs->regs[1] = ptr_to_compat_reg(&frame->info);
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regs->regs[2] = ptr_to_compat_reg(&frame->uc);
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regs->flags |= PT_FLAGS_CALLER_SAVES;
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return 0;
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err:
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trace_unhandled_signal("bad sigreturn frame", regs,
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(unsigned long)frame, SIGSEGV);
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return -EFAULT;
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}
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