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The function copy_siginfo_from_user32 is used for two things, in ptrace since the dawn of siginfo for arbirarily modifying a signal that user space sees, and in sigqueueinfo to send a signal with arbirary siginfo data. Create a single copy of copy_siginfo_from_user32 that all architectures share, and teach it to handle all of the cases in the siginfo union. In the generic version of copy_siginfo_from_user32 ensure that all of the fields in siginfo are initialized so that the siginfo structure can be safely copied to userspace if necessary. When copying the embedded sigval union copy the si_int member. That ensures the 32bit values passes through the kernel unchanged. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
89 lines
3.6 KiB
C
89 lines
3.6 KiB
C
/*
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* Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org>
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* Copyright (C) 2003 Carlos O'Donell <carlos at parisc-linux.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _PARISC64_KERNEL_SIGNAL32_H
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#define _PARISC64_KERNEL_SIGNAL32_H
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#include <linux/compat.h>
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/* 32-bit ucontext as seen from an 64-bit kernel */
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struct compat_ucontext {
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compat_uint_t uc_flags;
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compat_uptr_t uc_link;
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compat_stack_t uc_stack; /* struct compat_sigaltstack (12 bytes)*/
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/* FIXME: Pad out to get uc_mcontext to start at an 8-byte aligned boundary */
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compat_uint_t pad[1];
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struct compat_sigcontext uc_mcontext;
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compat_sigset_t uc_sigmask; /* mask last for extensibility */
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};
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/* ELF32 signal handling */
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int copy_siginfo_to_user32 (compat_siginfo_t __user *to, const siginfo_t *from);
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/* In a deft move of uber-hackery, we decide to carry the top half of all
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* 64-bit registers in a non-portable, non-ABI, hidden structure.
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* Userspace can read the hidden structure if it *wants* but is never
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* guaranteed to be in the same place. In fact the uc_sigmask from the
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* ucontext_t structure may push the hidden register file downards
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*/
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struct compat_regfile {
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/* Upper half of all the 64-bit registers that were truncated
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on a copy to a 32-bit userspace */
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compat_int_t rf_gr[32];
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compat_int_t rf_iasq[2];
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compat_int_t rf_iaoq[2];
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compat_int_t rf_sar;
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};
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#define COMPAT_SIGRETURN_TRAMP 4
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#define COMPAT_SIGRESTARTBLOCK_TRAMP 5
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#define COMPAT_TRAMP_SIZE (COMPAT_SIGRETURN_TRAMP + \
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COMPAT_SIGRESTARTBLOCK_TRAMP)
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struct compat_rt_sigframe {
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/* XXX: Must match trampoline size in arch/parisc/kernel/signal.c
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Secondary to that it must protect the ERESTART_RESTARTBLOCK
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trampoline we left on the stack (we were bad and didn't
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change sp so we could run really fast.) */
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compat_uint_t tramp[COMPAT_TRAMP_SIZE];
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compat_siginfo_t info;
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struct compat_ucontext uc;
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/* Hidden location of truncated registers, *must* be last. */
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struct compat_regfile regs;
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};
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/*
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* The 32-bit ABI wants at least 48 bytes for a function call frame:
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* 16 bytes for arg0-arg3, and 32 bytes for magic (the only part of
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* which Linux/parisc uses is sp-20 for the saved return pointer...)
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* Then, the stack pointer must be rounded to a cache line (64 bytes).
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*/
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#define SIGFRAME32 64
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#define FUNCTIONCALLFRAME32 48
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#define PARISC_RT_SIGFRAME_SIZE32 (((sizeof(struct compat_rt_sigframe) + FUNCTIONCALLFRAME32) + SIGFRAME32) & -SIGFRAME32)
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long restore_sigcontext32(struct compat_sigcontext __user *sc,
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struct compat_regfile __user *rf,
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struct pt_regs *regs);
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long setup_sigcontext32(struct compat_sigcontext __user *sc,
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struct compat_regfile __user *rf,
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struct pt_regs *regs, int in_syscall);
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#endif
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