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Al Viro 666547ff59 separate kernel- and userland-side msghdr 
Kernel-side struct msghdr is (currently) using the same layout as
userland one, but it's not a one-to-one copy - even without considering
32bit compat issues, we have msg_iov, msg_name and msg_control copied
to kernel[1].  It's fairly localized, so we get away with a few functions
where that knowledge is needed (and we could shrink that set even
more).  Pretty much everything deals with the kernel-side variant and
the few places that want userland one just use a bunch of force-casts
to paper over the differences.

The thing is, kernel-side definition of struct msghdr is *not* exposed
in include/uapi - libc doesn't see it, etc.  So we can add struct user_msghdr,
with proper annotations and let the few places that ever deal with those
beasts use it for userland pointers.  Saner typechecking aside, that will
allow to change the layout of kernel-side msghdr - e.g. replace
msg_iov/msg_iovlen there with struct iov_iter, getting rid of the need
to modify the iovec as we copy data to/from it, etc.

We could introduce kernel_msghdr instead, but that would create much more
noise - the absolute majority of the instances would need to have the
type switched to kernel_msghdr and definition of struct msghdr in
include/linux/socket.h is not going to be seen by userland anyway.

This commit just introduces user_msghdr and switches the few places that
are dealing with userland-side msghdr to it.

[1] actually, it's even trickier than that - we copy msg_control for
sendmsg, but keep the userland address on recvmsg.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2014-11-19 16:22:59 -05:00
..
.gitignore
arch_timer.c arch_timer: Move to generic sched_clock framework 2013-10-09 16:54:10 -07:00
armksyms.c ARM: 8151/1: add missing exports for asm functions required by get_user macro 2014-09-16 16:09:30 +01:00
arthur.c
asm-offsets.c ARM: Blacklist GCC 4.8.0 to GCC 4.8.2 - PR58854 2014-10-19 09:20:52 +01:00
atags.h
atags_compat.c
atags_parse.c ARM: 8152/1: Convert pr_warning to pr_warn 2014-09-26 14:39:53 +01:00
atags_proc.c
bios32.c ARM/PCI: Call pcie_bus_configure_settings() to set MPS 2014-05-30 10:50:57 -06:00
calls.S ARM: enable bpf syscall 2014-10-29 00:18:20 +00:00
cpuidle.c
crash_dump.c ARM: 8012/1: kdump: Avoid overflow when converting pfn to physaddr 2014-04-07 12:10:00 +01:00
debug.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
devtree.c arm: Add devicetree fixup machine function 2014-07-29 21:26:49 -06:00
dma-isa.c
dma.c
early_printk.c
elf.c
entry-armv.S Merge branches 'fiq' (early part), 'fixes', 'l2c' (early part) and 'misc' into for-next 2014-10-02 21:47:02 +01:00
entry-common.S ARM: Avoid writing to control register on every exception 2014-09-26 14:39:54 +01:00
entry-header.S Merge branches 'fiq' (early part), 'fixes', 'l2c' (early part) and 'misc' into for-next 2014-10-02 21:47:02 +01:00
entry-v7m.S ARM: 7890/1: v7-M: drop using mach/entry-macro.S 2013-12-29 12:32:32 +00:00
etm.c ARM: 7905/1: etm: Remove unnecessary amba_set_drvdata() 2013-12-29 12:32:34 +00:00
fiq.c ARM: 8150/3: fiq: Replace default FIQ handler 2014-09-18 00:35:18 +01:00
fiqasm.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
ftrace.c ARM: 8022/1: ftrace: work with CONFIG_DEBUG_SET_MODULE_RONX 2014-04-23 01:24:31 +01:00
head-common.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
head-nommu.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
head.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
hibernate.c nosave: consolidate __nosave_{begin,end} in <asm/sections.h> 2014-10-09 22:26:04 -04:00
hw_breakpoint.c ARM: 8152/1: Convert pr_warning to pr_warn 2014-09-26 14:39:53 +01:00
hyp-stub.S Here are the PPC and ARM changes for KVM, which I separated because 2014-08-07 11:35:30 -07:00
insn.c
insn.h
io.c ARM: 7930/1: Introduce atomic MMIO modify 2014-01-28 14:06:25 +00:00
irq.c Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-10-09 06:42:04 -04:00
isa.c arm: convert use of typedef ctl_table to struct ctl_table 2014-06-06 16:08:15 -07:00
iwmmxt.S Merge branches 'fixes' and 'misc' into for-next 2014-08-05 10:27:13 +01:00
jump_label.c
kgdb.c ARM: 8124/1: don't enter kgdb when userspace executes a kgdb break instruction 2014-08-02 15:20:30 +01:00
kprobes-arm.c ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
kprobes-common.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
kprobes-test-arm.c ARM: kprobes: Fix test code compilation errors for ARMv4 targets 2014-07-02 12:48:36 +01:00
kprobes-test-thumb.c ARM: kprobes-test: use <asm/opcodes.h> for Thumb instruction building 2014-04-01 16:48:26 +03:00
kprobes-test.c ARM: 8179/1: kprobes-test: Fix compile error "bad immediate value for offset" 2014-09-30 16:55:24 +01:00
kprobes-test.h ARM: 8179/1: kprobes-test: Fix compile error "bad immediate value for offset" 2014-09-30 16:55:24 +01:00
kprobes-thumb.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
kprobes.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
kprobes.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
machine_kexec.c ARM: 8030/1: ARM : kdump : add arch_crash_save_vmcoreinfo 2014-04-22 22:23:58 +01:00
Makefile Merge branches 'alignment', 'fixes', 'l2c' (early part) and 'misc' into for-next 2014-06-05 12:35:52 +01:00
module.c ARM: 8127/1: module: add support for R_ARM_TARGET1 relocations 2014-08-27 15:40:11 +01:00
opcodes.c
patch.c
patch.h
perf_event.c Merge branch 'devel-stable' into for-next 2014-08-05 10:27:25 +01:00
perf_event_cpu.c Merge branches 'fiq' (early part), 'fixes', 'l2c' (early part) and 'misc' into for-next 2014-10-02 21:47:02 +01:00
perf_event_v6.c arm: perf: clean up PMU names 2014-07-02 15:48:25 +01:00
perf_event_v7.c arm: perf: krait: stop using singleton PMU 2014-07-02 15:48:26 +01:00
perf_event_xscale.c arm: perf: clean up PMU names 2014-07-02 15:48:25 +01:00
perf_regs.c ARM: perf: add support for perf registers API 2013-09-30 16:41:50 +01:00
pj4-cp0.c ARM: 8040/1: pj4: properly detect existence of iWMMXt coprocessor 2014-04-25 12:07:34 +01:00
probes-arm.c ARM: kprobes: Disallow instructions with PC and register specified shift 2014-07-02 12:48:36 +01:00
probes-arm.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
probes-thumb.c ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
probes-thumb.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
probes.c ARM: probes: fix instruction fetch order with <asm/opcodes.h> 2014-04-01 16:45:19 +03:00
probes.h ARM: Make arch_specific_insn a define for new arch_probes_insn structure 2014-03-18 16:39:40 -04:00
process.c Immutable branch with restart handler patches for v3.18 2014-10-10 16:38:02 -04:00
psci.c PSCI: Add initial support for PSCIv0.2 functions 2014-05-15 10:16:00 -04:00
psci_smp.c ARM: Check if a CPU has gone offline 2014-05-15 10:16:30 -04:00
ptrace.c Merge git://git.infradead.org/users/eparis/audit 2014-10-19 16:25:56 -07:00
relocate_kernel.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
return_address.c ARM: 8160/1: drop warning about return_address not using unwind tables 2014-09-26 14:40:07 +01:00
setup.c ARM: 8150/3: fiq: Replace default FIQ handler 2014-09-18 00:35:18 +01:00
signal.c ARM: add uprobes support 2014-03-18 16:39:40 -04:00
sigreturn_codes.S ARM: 7895/1: signal: fix armv7-m build issue in sigreturn_codes.S 2013-11-30 22:21:00 +00:00
sleep.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
smp.c Merge branch 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-10-09 06:30:57 -04:00
smp_scu.c ARM: 8122/1: smp_scu: enable SCU standby support 2014-08-02 08:51:53 +01:00
smp_tlb.c ARM: 8111/1: Enable erratum 798181 for Broadcom Brahma-B15 2014-07-24 14:40:26 +01:00
smp_twd.c arm: Replace __this_cpu_ptr with raw_cpu_ptr 2014-08-26 13:45:50 -04:00
stacktrace.c ARM: 8049/1: ftrace/add save_stack_trace_regs() implementation 2014-05-30 01:12:32 +01:00
suspend.c
swp_emulate.c ARM: 8135/1: Fix in-correct barrier usage in SWP{B} emulation 2014-09-12 17:38:58 +01:00
sys_arm.c
sys_oabi-compat.c separate kernel- and userland-side msghdr 2014-11-19 16:22:59 -05:00
tcm.c ARM: add permission annotations to MT_MEMORY* mapping types 2013-12-11 09:53:14 +00:00
thumbee.c ARM: 8148/1: flush TLS and thumbee register state during exec 2014-09-16 16:09:32 +01:00
time.c ARM: 8072/1: time: Make use of arm_get_current_stackframe 2014-07-18 12:29:14 +01:00
topology.c ARM: topology: Use the new cpu_capacity interface 2014-09-19 12:35:27 +02:00
traps.c Merge branches 'fiq' (early part), 'fixes', 'l2c' (early part) and 'misc' into for-next 2014-10-02 21:47:02 +01:00
unwind.c ARM: 8152/1: Convert pr_warning to pr_warn 2014-09-26 14:39:53 +01:00
uprobes-arm.c ARM: add uprobes support 2014-03-18 16:39:40 -04:00
uprobes.c ARM: 8043/1: uprobes need icache flush after xol write 2014-05-25 23:48:45 +01:00
uprobes.h ARM: add uprobes support 2014-03-18 16:39:40 -04:00
v7m.c
vmlinux.lds.S ARM: 8168/1: extend __init_end to a page align address 2014-10-02 21:28:16 +01:00
xscale-cp0.c