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![Will Springer](/assets/img/avatar_default.png)
Swap upper/lower 32 bits for 64-bit compat syscalls, conditioned on endianness. This is modeled after the same functionality in arch/mips/kernel/linux32.c. This fixes compat_sys on ppc64le, when called by 32-bit little-endian processes. Tested with `file /bin/bash` (pread64) and `truncate -s 5G test` (ftruncate64). Signed-off-by: Will Springer <skirmisher@protonmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/2765111.e9J7NaK4W3@sheen
122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* sys_ppc32.c: Conversion between 32bit and 64bit native syscalls.
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*
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* Copyright (C) 2001 IBM
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
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*
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* These routines maintain argument size conversion between 32bit and 64bit
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* environment.
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/file.h>
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#include <linux/signal.h>
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#include <linux/resource.h>
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#include <linux/times.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/poll.h>
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#include <linux/personality.h>
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#include <linux/stat.h>
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#include <linux/mman.h>
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#include <linux/in.h>
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#include <linux/syscalls.h>
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#include <linux/unistd.h>
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#include <linux/sysctl.h>
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#include <linux/binfmts.h>
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#include <linux/security.h>
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#include <linux/compat.h>
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#include <linux/ptrace.h>
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#include <linux/elf.h>
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#include <linux/ipc.h>
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#include <linux/slab.h>
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#include <asm/ptrace.h>
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#include <asm/types.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/time.h>
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#include <asm/mmu_context.h>
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#include <asm/ppc-pci.h>
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#include <asm/syscalls.h>
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#include <asm/switch_to.h>
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unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
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unsigned long prot, unsigned long flags,
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unsigned long fd, unsigned long pgoff)
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{
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/* This should remain 12 even if PAGE_SIZE changes */
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return sys_mmap(addr, len, prot, flags, fd, pgoff << 12);
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}
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/*
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* long long munging:
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* The 32 bit ABI passes long longs in an odd even register pair.
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* High and low parts are swapped depending on endian mode,
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* so define a macro (similar to mips linux32) to handle that.
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*/
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#ifdef __LITTLE_ENDIAN__
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#define merge_64(low, high) ((u64)high << 32) | low
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#else
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#define merge_64(high, low) ((u64)high << 32) | low
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#endif
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compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count,
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u32 reg6, u32 pos1, u32 pos2)
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{
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return ksys_pread64(fd, ubuf, count, merge_64(pos1, pos2));
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}
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compat_ssize_t compat_sys_pwrite64(unsigned int fd, const char __user *ubuf, compat_size_t count,
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u32 reg6, u32 pos1, u32 pos2)
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{
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return ksys_pwrite64(fd, ubuf, count, merge_64(pos1, pos2));
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}
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compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offset1, u32 offset2, u32 count)
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{
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return ksys_readahead(fd, merge_64(offset1, offset2), count);
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}
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asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4,
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unsigned long len1, unsigned long len2)
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{
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return ksys_truncate(path, merge_64(len1, len2));
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}
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asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offset1, u32 offset2,
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u32 len1, u32 len2)
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{
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return ksys_fallocate(fd, mode, ((loff_t)offset1 << 32) | offset2,
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merge_64(len1, len2));
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}
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asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long len1,
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unsigned long len2)
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{
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return ksys_ftruncate(fd, merge_64(len1, len2));
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}
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long ppc32_fadvise64(int fd, u32 unused, u32 offset1, u32 offset2,
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size_t len, int advice)
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{
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return ksys_fadvise64_64(fd, merge_64(offset1, offset2), len,
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advice);
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}
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asmlinkage long compat_sys_sync_file_range2(int fd, unsigned int flags,
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unsigned offset1, unsigned offset2,
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unsigned nbytes1, unsigned nbytes2)
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{
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loff_t offset = merge_64(offset1, offset2);
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loff_t nbytes = merge_64(nbytes1, nbytes2);
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return ksys_sync_file_range(fd, offset, nbytes, flags);
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}
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