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powerpc/32: fix syscall wrappers with 64-bit arguments of unaligned register-pairs
powerpc 32-bit system call (and function) calling convention for 64-bit
arguments requires the next available odd-pair (two sequential registers
with the first being odd-numbered) from the standard register argument
allocation.
The first argument register is r3, so a 64-bit argument that appears at
an even position in the argument list must skip a register (unless there
were preceding 64-bit arguments, which might throw things off). This
requires non-standard compat definitions to deal with the holes in the
argument register allocation.
With pt_regs syscall wrappers which use a standard mapper to map pt_regs
GPRs to function arguments, 32-bit kernels hit the same basic problem,
the standard definitions don't cope with the unused argument registers.
Fix this by having 32-bit kernels share those syscall definitions with
compat.
Thanks to Jason for spending a lot of time finding and bisecting this
and developing a trivial reproducer. The perfect bug report.
Reported-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Fixes: 7e92e01b72 ("powerpc: Provide syscall wrapper")
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221012035335.866440-1-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin
Michael Ellerman
parent
ae5b6779fa
commit
e237506238
@ -89,6 +89,22 @@ long compat_sys_rt_sigreturn(void);
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* responsible for combining parameter pairs.
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*/
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#ifdef CONFIG_PPC32
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long sys_ppc_pread64(unsigned int fd,
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char __user *ubuf, compat_size_t count,
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u32 reg6, u32 pos1, u32 pos2);
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long sys_ppc_pwrite64(unsigned int fd,
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const char __user *ubuf, compat_size_t count,
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u32 reg6, u32 pos1, u32 pos2);
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long sys_ppc_readahead(int fd, u32 r4,
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u32 offset1, u32 offset2, u32 count);
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long sys_ppc_truncate64(const char __user *path, u32 reg4,
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unsigned long len1, unsigned long len2);
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long sys_ppc_ftruncate64(unsigned int fd, u32 reg4,
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unsigned long len1, unsigned long len2);
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long sys_ppc32_fadvise64(int fd, u32 unused, u32 offset1, u32 offset2,
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size_t len, int advice);
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#endif
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#ifdef CONFIG_COMPAT
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long compat_sys_mmap2(unsigned long addr, size_t len,
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unsigned long prot, unsigned long flags,
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@ -73,6 +73,7 @@ obj-y := cputable.o syscalls.o \
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obj-y += ptrace/
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obj-$(CONFIG_PPC64) += setup_64.o irq_64.o\
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paca.o nvram_64.o note.o
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obj-$(CONFIG_PPC32) += sys_ppc32.o
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obj-$(CONFIG_COMPAT) += sys_ppc32.o signal_32.o
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obj-$(CONFIG_VDSO32) += vdso32_wrapper.o
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obj-$(CONFIG_PPC_WATCHDOG) += watchdog.o
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@ -1,13 +1,23 @@
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// 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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* sys_ppc32.c: 32-bit system calls with complex calling conventions.
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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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* 32-bit system calls with 64-bit arguments pass those in register pairs.
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* This must be specially dealt with on 64-bit kernels. The compat_arg_u64_dual
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* in generic compat syscalls is not always usable because the register
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* pairing is constrained depending on preceding arguments.
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*
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* An analogous problem exists on 32-bit kernels with ARCH_HAS_SYSCALL_WRAPPER,
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* the defined system call functions take the pt_regs as an argument, and there
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* is a mapping macro which maps registers to arguments
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* (SC_POWERPC_REGS_TO_ARGS) which also does not deal with these 64-bit
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* arguments.
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*
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* This file contains these system calls.
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*/
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#include <linux/kernel.h>
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@ -47,7 +57,17 @@
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#include <asm/syscalls.h>
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#include <asm/switch_to.h>
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COMPAT_SYSCALL_DEFINE6(ppc_pread64,
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#ifdef CONFIG_PPC32
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#define PPC32_SYSCALL_DEFINE4 SYSCALL_DEFINE4
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#define PPC32_SYSCALL_DEFINE5 SYSCALL_DEFINE5
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#define PPC32_SYSCALL_DEFINE6 SYSCALL_DEFINE6
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#else
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#define PPC32_SYSCALL_DEFINE4 COMPAT_SYSCALL_DEFINE4
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#define PPC32_SYSCALL_DEFINE5 COMPAT_SYSCALL_DEFINE5
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#define PPC32_SYSCALL_DEFINE6 COMPAT_SYSCALL_DEFINE6
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#endif
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PPC32_SYSCALL_DEFINE6(ppc_pread64,
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unsigned int, fd,
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char __user *, ubuf, compat_size_t, count,
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u32, reg6, u32, pos1, u32, pos2)
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@ -55,7 +75,7 @@ COMPAT_SYSCALL_DEFINE6(ppc_pread64,
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return ksys_pread64(fd, ubuf, count, merge_64(pos1, pos2));
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}
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COMPAT_SYSCALL_DEFINE6(ppc_pwrite64,
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PPC32_SYSCALL_DEFINE6(ppc_pwrite64,
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unsigned int, fd,
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const char __user *, ubuf, compat_size_t, count,
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u32, reg6, u32, pos1, u32, pos2)
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@ -63,28 +83,28 @@ COMPAT_SYSCALL_DEFINE6(ppc_pwrite64,
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return ksys_pwrite64(fd, ubuf, count, merge_64(pos1, pos2));
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}
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COMPAT_SYSCALL_DEFINE5(ppc_readahead,
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PPC32_SYSCALL_DEFINE5(ppc_readahead,
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int, fd, u32, r4,
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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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COMPAT_SYSCALL_DEFINE4(ppc_truncate64,
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PPC32_SYSCALL_DEFINE4(ppc_truncate64,
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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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COMPAT_SYSCALL_DEFINE4(ppc_ftruncate64,
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PPC32_SYSCALL_DEFINE4(ppc_ftruncate64,
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unsigned int, fd, u32, reg4,
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unsigned long, len1, 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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COMPAT_SYSCALL_DEFINE6(ppc32_fadvise64,
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PPC32_SYSCALL_DEFINE6(ppc32_fadvise64,
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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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@ -228,8 +228,10 @@
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176 64 rt_sigtimedwait sys_rt_sigtimedwait
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177 nospu rt_sigqueueinfo sys_rt_sigqueueinfo compat_sys_rt_sigqueueinfo
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178 nospu rt_sigsuspend sys_rt_sigsuspend compat_sys_rt_sigsuspend
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179 common pread64 sys_pread64 compat_sys_ppc_pread64
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180 common pwrite64 sys_pwrite64 compat_sys_ppc_pwrite64
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179 32 pread64 sys_ppc_pread64 compat_sys_ppc_pread64
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179 64 pread64 sys_pread64
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180 32 pwrite64 sys_ppc_pwrite64 compat_sys_ppc_pwrite64
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180 64 pwrite64 sys_pwrite64
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181 common chown sys_chown
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182 common getcwd sys_getcwd
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183 common capget sys_capget
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@ -242,10 +244,11 @@
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188 common putpmsg sys_ni_syscall
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189 nospu vfork sys_vfork
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190 common ugetrlimit sys_getrlimit compat_sys_getrlimit
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191 common readahead sys_readahead compat_sys_ppc_readahead
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191 32 readahead sys_ppc_readahead compat_sys_ppc_readahead
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191 64 readahead sys_readahead
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192 32 mmap2 sys_mmap2 compat_sys_mmap2
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193 32 truncate64 sys_truncate64 compat_sys_ppc_truncate64
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194 32 ftruncate64 sys_ftruncate64 compat_sys_ppc_ftruncate64
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193 32 truncate64 sys_ppc_truncate64 compat_sys_ppc_truncate64
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194 32 ftruncate64 sys_ppc_ftruncate64 compat_sys_ppc_ftruncate64
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195 32 stat64 sys_stat64
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196 32 lstat64 sys_lstat64
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197 32 fstat64 sys_fstat64
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@ -288,7 +291,8 @@
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230 common io_submit sys_io_submit compat_sys_io_submit
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231 common io_cancel sys_io_cancel
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232 nospu set_tid_address sys_set_tid_address
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233 common fadvise64 sys_fadvise64 compat_sys_ppc32_fadvise64
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233 32 fadvise64 sys_ppc32_fadvise64 compat_sys_ppc32_fadvise64
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233 64 fadvise64 sys_fadvise64
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234 nospu exit_group sys_exit_group
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235 nospu lookup_dcookie sys_lookup_dcookie compat_sys_lookup_dcookie
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236 common epoll_create sys_epoll_create
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