x86/entry/32: Use IA32-specific wrappers for syscalls taking 64-bit arguments
For the 32-bit syscall interface, 64-bit arguments (loff_t) are passed via a pair of 32-bit registers. These register pairs end up in consecutive stack slots, which matches the C ABI for 64-bit arguments. But when accessing the registers directly from pt_regs, the wrapper needs to manually reassemble the 64-bit value. These wrappers already exist for 32-bit compat, so make them available to 32-bit native in preparation for enabling pt_regs-based syscalls. Signed-off-by: Brian Gerst <brgerst@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net> Link: https://lkml.kernel.org/r/20200313195144.164260-16-brgerst@gmail.com
This commit is contained in:
Brian Gerst
Thomas Gleixner
parent
866128a996
commit
121b32a58a
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@ -191,8 +191,8 @@
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177 i386 rt_sigtimedwait sys_rt_sigtimedwait_time32 compat_sys_rt_sigtimedwait_time32
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178 i386 rt_sigqueueinfo sys_rt_sigqueueinfo compat_sys_rt_sigqueueinfo
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179 i386 rt_sigsuspend sys_rt_sigsuspend compat_sys_rt_sigsuspend
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180 i386 pread64 sys_pread64 compat_sys_ia32_pread64
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181 i386 pwrite64 sys_pwrite64 compat_sys_ia32_pwrite64
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180 i386 pread64 sys_ia32_pread64
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181 i386 pwrite64 sys_ia32_pwrite64
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182 i386 chown sys_chown16
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183 i386 getcwd sys_getcwd
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184 i386 capget sys_capget
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@ -204,8 +204,8 @@
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190 i386 vfork sys_vfork
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191 i386 ugetrlimit sys_getrlimit compat_sys_getrlimit
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192 i386 mmap2 sys_mmap_pgoff
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193 i386 truncate64 sys_truncate64 compat_sys_ia32_truncate64
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194 i386 ftruncate64 sys_ftruncate64 compat_sys_ia32_ftruncate64
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193 i386 truncate64 sys_ia32_truncate64
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194 i386 ftruncate64 sys_ia32_ftruncate64
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195 i386 stat64 sys_stat64 compat_sys_ia32_stat64
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196 i386 lstat64 sys_lstat64 compat_sys_ia32_lstat64
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197 i386 fstat64 sys_fstat64 compat_sys_ia32_fstat64
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@ -236,7 +236,7 @@
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# 222 is unused
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# 223 is unused
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224 i386 gettid sys_gettid
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225 i386 readahead sys_readahead compat_sys_ia32_readahead
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225 i386 readahead sys_ia32_readahead
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226 i386 setxattr sys_setxattr
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227 i386 lsetxattr sys_lsetxattr
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228 i386 fsetxattr sys_fsetxattr
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@ -261,7 +261,7 @@
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247 i386 io_getevents sys_io_getevents_time32
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248 i386 io_submit sys_io_submit compat_sys_io_submit
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249 i386 io_cancel sys_io_cancel
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250 i386 fadvise64 sys_fadvise64 compat_sys_ia32_fadvise64
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250 i386 fadvise64 sys_ia32_fadvise64
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# 251 is available for reuse (was briefly sys_set_zone_reclaim)
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252 i386 exit_group sys_exit_group
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253 i386 lookup_dcookie sys_lookup_dcookie compat_sys_lookup_dcookie
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@ -283,7 +283,7 @@
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269 i386 fstatfs64 sys_fstatfs64 compat_sys_fstatfs64
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270 i386 tgkill sys_tgkill
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271 i386 utimes sys_utimes_time32
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272 i386 fadvise64_64 sys_fadvise64_64 compat_sys_ia32_fadvise64_64
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272 i386 fadvise64_64 sys_ia32_fadvise64_64
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273 i386 vserver
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274 i386 mbind sys_mbind
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275 i386 get_mempolicy sys_get_mempolicy compat_sys_get_mempolicy
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@ -325,7 +325,7 @@
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311 i386 set_robust_list sys_set_robust_list compat_sys_set_robust_list
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312 i386 get_robust_list sys_get_robust_list compat_sys_get_robust_list
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313 i386 splice sys_splice
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314 i386 sync_file_range sys_sync_file_range compat_sys_ia32_sync_file_range
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314 i386 sync_file_range sys_ia32_sync_file_range
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315 i386 tee sys_tee
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316 i386 vmsplice sys_vmsplice compat_sys_vmsplice
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317 i386 move_pages sys_move_pages compat_sys_move_pages
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@ -335,7 +335,7 @@
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321 i386 signalfd sys_signalfd compat_sys_signalfd
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322 i386 timerfd_create sys_timerfd_create
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323 i386 eventfd sys_eventfd
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324 i386 fallocate sys_fallocate compat_sys_ia32_fallocate
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324 i386 fallocate sys_ia32_fallocate
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325 i386 timerfd_settime sys_timerfd_settime32
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326 i386 timerfd_gettime sys_timerfd_gettime32
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327 i386 signalfd4 sys_signalfd4 compat_sys_signalfd4
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@ -3,7 +3,7 @@
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# Makefile for the ia32 kernel emulation subsystem.
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#
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obj-$(CONFIG_IA32_EMULATION) := sys_ia32.o ia32_signal.o
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obj-$(CONFIG_IA32_EMULATION) := ia32_signal.o
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obj-$(CONFIG_IA32_AOUT) += ia32_aout.o
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@ -53,6 +53,8 @@ obj-y += setup.o x86_init.o i8259.o irqinit.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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obj-$(CONFIG_IRQ_WORK) += irq_work.o
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obj-y += probe_roms.o
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obj-$(CONFIG_X86_32) += sys_ia32.o
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obj-$(CONFIG_IA32_EMULATION) += sys_ia32.o
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obj-$(CONFIG_X86_64) += sys_x86_64.o
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obj-$(CONFIG_X86_ESPFIX64) += espfix_64.o
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obj-$(CONFIG_SYSFS) += ksysfs.o
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@ -51,20 +51,80 @@
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#define AA(__x) ((unsigned long)(__x))
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COMPAT_SYSCALL_DEFINE3(ia32_truncate64, const char __user *, filename,
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unsigned long, offset_low, unsigned long, offset_high)
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SYSCALL_DEFINE3(ia32_truncate64, const char __user *, filename,
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unsigned long, offset_low, unsigned long, offset_high)
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{
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return ksys_truncate(filename,
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((loff_t) offset_high << 32) | offset_low);
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}
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COMPAT_SYSCALL_DEFINE3(ia32_ftruncate64, unsigned int, fd,
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unsigned long, offset_low, unsigned long, offset_high)
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SYSCALL_DEFINE3(ia32_ftruncate64, unsigned int, fd,
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unsigned long, offset_low, unsigned long, offset_high)
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{
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return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
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}
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/* warning: next two assume little endian */
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SYSCALL_DEFINE5(ia32_pread64, unsigned int, fd, char __user *, ubuf,
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u32, count, u32, poslo, u32, poshi)
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{
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return ksys_pread64(fd, ubuf, count,
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((loff_t)AA(poshi) << 32) | AA(poslo));
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}
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SYSCALL_DEFINE5(ia32_pwrite64, unsigned int, fd, const char __user *, ubuf,
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u32, count, u32, poslo, u32, poshi)
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{
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return ksys_pwrite64(fd, ubuf, count,
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((loff_t)AA(poshi) << 32) | AA(poslo));
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}
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/*
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* Some system calls that need sign extended arguments. This could be
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* done by a generic wrapper.
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*/
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SYSCALL_DEFINE6(ia32_fadvise64_64, int, fd, __u32, offset_low,
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__u32, offset_high, __u32, len_low, __u32, len_high,
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int, advice)
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{
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return ksys_fadvise64_64(fd,
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(((u64)offset_high)<<32) | offset_low,
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(((u64)len_high)<<32) | len_low,
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advice);
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}
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SYSCALL_DEFINE4(ia32_readahead, int, fd, unsigned int, off_lo,
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unsigned int, off_hi, size_t, count)
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{
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return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
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}
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SYSCALL_DEFINE6(ia32_sync_file_range, int, fd, unsigned int, off_low,
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unsigned int, off_hi, unsigned int, n_low,
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unsigned int, n_hi, int, flags)
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{
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return ksys_sync_file_range(fd,
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((u64)off_hi << 32) | off_low,
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((u64)n_hi << 32) | n_low, flags);
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}
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SYSCALL_DEFINE5(ia32_fadvise64, int, fd, unsigned int, offset_lo,
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unsigned int, offset_hi, size_t, len, int, advice)
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{
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return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
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len, advice);
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}
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SYSCALL_DEFINE6(ia32_fallocate, int, fd, int, mode,
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unsigned int, offset_lo, unsigned int, offset_hi,
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unsigned int, len_lo, unsigned int, len_hi)
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{
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return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
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((u64)len_hi << 32) | len_lo);
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}
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#ifdef CONFIG_IA32_EMULATION
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/*
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* Another set for IA32/LFS -- x86_64 struct stat is different due to
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* support for 64bit inode numbers.
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@ -170,66 +230,6 @@ COMPAT_SYSCALL_DEFINE1(ia32_mmap, struct mmap_arg_struct32 __user *, arg)
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a.offset>>PAGE_SHIFT);
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}
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/* warning: next two assume little endian */
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COMPAT_SYSCALL_DEFINE5(ia32_pread64, unsigned int, fd, char __user *, ubuf,
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u32, count, u32, poslo, u32, poshi)
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{
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return ksys_pread64(fd, ubuf, count,
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((loff_t)AA(poshi) << 32) | AA(poslo));
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}
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COMPAT_SYSCALL_DEFINE5(ia32_pwrite64, unsigned int, fd, const char __user *, ubuf,
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u32, count, u32, poslo, u32, poshi)
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{
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return ksys_pwrite64(fd, ubuf, count,
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((loff_t)AA(poshi) << 32) | AA(poslo));
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}
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/*
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* Some system calls that need sign extended arguments. This could be
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* done by a generic wrapper.
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*/
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COMPAT_SYSCALL_DEFINE6(ia32_fadvise64_64, int, fd, __u32, offset_low,
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__u32, offset_high, __u32, len_low, __u32, len_high,
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int, advice)
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{
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return ksys_fadvise64_64(fd,
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(((u64)offset_high)<<32) | offset_low,
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(((u64)len_high)<<32) | len_low,
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advice);
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}
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COMPAT_SYSCALL_DEFINE4(ia32_readahead, int, fd, unsigned int, off_lo,
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unsigned int, off_hi, size_t, count)
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{
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return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
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}
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COMPAT_SYSCALL_DEFINE6(ia32_sync_file_range, int, fd, unsigned int, off_low,
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unsigned int, off_hi, unsigned int, n_low,
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unsigned int, n_hi, int, flags)
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{
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return ksys_sync_file_range(fd,
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((u64)off_hi << 32) | off_low,
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((u64)n_hi << 32) | n_low, flags);
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}
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COMPAT_SYSCALL_DEFINE5(ia32_fadvise64, int, fd, unsigned int, offset_lo,
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unsigned int, offset_hi, size_t, len, int, advice)
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{
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return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
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len, advice);
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}
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COMPAT_SYSCALL_DEFINE6(ia32_fallocate, int, fd, int, mode,
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unsigned int, offset_lo, unsigned int, offset_hi,
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unsigned int, len_lo, unsigned int, len_hi)
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{
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return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
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((u64)len_hi << 32) | len_lo);
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}
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/*
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* The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS
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*/
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@ -252,3 +252,4 @@ COMPAT_SYSCALL_DEFINE5(ia32_clone, unsigned long, clone_flags,
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return _do_fork(&args);
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}
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#endif /* CONFIG_IA32_EMULATION */
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@ -21,6 +21,7 @@ obj-y += checksum_32.o syscalls_32.o
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obj-$(CONFIG_ELF_CORE) += elfcore.o
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subarch-y = ../lib/string_32.o ../lib/atomic64_32.o ../lib/atomic64_cx8_32.o
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subarch-y += ../kernel/sys_ia32.o
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else
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