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e90e6fddc5
linux/arch/mips/include/asm
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Alex Smith e90e6fddc5 MIPS: O32/32-bit: Fix bug which can cause incorrect system call restarts 
On 32-bit/O32, pt_regs has a padding area at the beginning into which the
syscall arguments passed via the user stack are copied. 4 arguments
totalling 16 bytes are copied to offset 16 bytes into this area, however
the area is only 24 bytes long. This means the last 2 arguments overwrite
pt_regs->regs[{0,1}].

If a syscall function returns an error, handle_sys stores the original
syscall number in pt_regs->regs[0] for syscall restart. signal.c checks
whether regs[0] is non-zero, if it is it will check whether the syscall
return value is one of the ERESTART* codes to see if it must be
restarted.

Should a syscall be made that results in a non-zero value being copied
off the user stack into regs[0], and then returns a positive (non-error)
value that matches one of the ERESTART* error codes, this can be mistaken
for requiring a syscall restart.

While the possibility for this to occur has always existed, it is made
much more likely to occur by commit 46e12c07b3 ("MIPS: O32 / 32-bit:
Always copy 4 stack arguments."), since now every syscall will copy 4
arguments and overwrite regs[0], rather than just those with 7 or 8
arguments.

Since that commit, booting Debian under a 32-bit MIPS kernel almost
always results in a hang early in boot, due to a wait4 syscall returning
a PID that matches one of the ERESTART* codes, which then causes an
incorrect restart of the syscall.

The problem is fixed by increasing the size of the padding area so that
arguments copied off the stack will not overwrite pt_regs->regs[{0,1}].

Signed-off-by: Alex Smith <alex.smith@imgtec.com>
Cc: <stable@vger.kernel.org> # v3.13+
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Tested-by: Aurelien Jarno <aurelien@aurel32.net>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7454/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2014-08-02 00:06:37 +02:00
..
dec DEC: Document the R4k MB ASIC mini interrupt controller 2014-06-04 22:50:41 +02:00
emma MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
fw MIPS: malta: malta-memory: Add support for the 'ememsize' variable 2014-03-26 23:09:20 +01:00
ip32 MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
lasat MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
mach-ar7 Revert "MIPS: make CAC_ADDR and UNCAC_ADDR account for PHYS_OFFSET" 2013-07-01 15:10:58 +02:00
mach-ath79 mips: delete non-required instances of include <linux/init.h> 2014-01-24 22:39:56 +01:00
mach-au1x00 MIPS: Alchemy: remove old clock support 2014-07-30 14:12:00 +02:00
mach-bcm47xx MIPS: BCM47xx: Distinguish WRT54G series devices by boardtype 2014-07-30 22:16:02 +02:00
mach-bcm63xx MIPS: BCM63xx: Append irq line to irq_{stat,mask}* 2014-07-30 15:28:11 +02:00
mach-cavium-octeon MIPS: Octeon: Add twsi interrupt initialization for OCTEON 3XXX, 5XXX, 63XX 2014-06-04 22:50:42 +02:00
mach-cobalt MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
mach-db1x00 MIPS: Alchemy: fold mach-db1xxx/db1x00 headers into board code 2014-03-26 23:09:21 +01:00
mach-dec MIPS: DECstation CPU feature overrides 2013-10-29 21:24:46 +01:00
mach-emma2rh MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
mach-generic mips: delete non-required instances of include <linux/init.h> 2014-01-24 22:39:56 +01:00
mach-ip22 MIPS: IP22: This platform may come with either MIPS III or MIPS IV CPUs. 2014-05-23 15:10:59 +02:00
mach-ip27 MIPS: Remove unnecessary platform dma helper functions 2013-10-29 21:24:40 +01:00
mach-ip28 MIPS: Optimize current_cpu_type() for better code. 2013-09-17 18:50:53 +02:00
mach-ip32 MIPS: Remove unnecessary platform dma helper functions 2013-10-29 21:24:40 +01:00
mach-jazz mips: delete non-required instances of include <linux/init.h> 2014-01-24 22:39:56 +01:00
mach-jz4740 ASoC: jz4740: Improve build test coverage 2014-04-23 12:18:44 +01:00
mach-lantiq MIPS: Lantiq: Falcon: add cpu-feature-override.h 2013-09-03 23:22:16 +02:00
mach-lasat MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
mach-loongson MIPS: Loongson: Rename CONFIG_LEMOTE_MACH3A to CONFIG_LOONGSON_MACH3X 2014-07-30 21:47:33 +02:00
mach-loongson1 MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
mach-malta MIPS: Malta: add suspend state entry code 2014-05-30 21:01:09 +02:00
mach-netlogic MIPS: Netlogic: Fix uniprocessor compilation 2014-05-30 16:44:55 +02:00
mach-paravirt MIPS: Add code for new system 'paravirt' 2014-06-02 12:34:20 +02:00
mach-pmcs-msp71xx MIPS: MSP71xx: Remove checks for two macros 2014-05-23 15:12:39 +02:00
mach-pnx833x MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
mach-ralink MIPS: Ralink: Remove surviving RM9000 bits. 2014-05-23 15:12:40 +02:00
mach-rc32434 MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
mach-rm MIPS: PMC-Sierra Yosemite: Remove support. 2012-12-13 18:15:30 +01:00
mach-sead3 MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
mach-sibyte MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
mach-tx39xx MIPS: PMC-Sierra Yosemite: Remove support. 2012-12-13 18:15:30 +01:00
mach-tx49xx MIPS: PMC-Sierra Yosemite: Remove support. 2012-12-13 18:15:30 +01:00
mach-vr41xx MIPS: PMC-Sierra Yosemite: Remove support. 2012-12-13 18:15:30 +01:00
mips-boards Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-06-09 18:10:34 -07:00
netlogic MIPS: Add MSI support for XLP9XX 2014-05-30 16:51:02 +02:00
octeon MIPS: Octeon: Remove checks for CONFIG_CAVIUM_GDB 2014-05-23 15:12:39 +02:00
pci MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
sgi MIPS: IP22/IP28: Improve GIO support 2014-06-04 22:50:42 +02:00
sibyte MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
sn MIPS: IP27: Remove pfn_t. 2013-05-08 03:51:58 +02:00
txx9 MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
vr41xx MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
xtalk MIPS: IP27: Fix build errors with CONFIG_PCI disabled. 2013-06-21 18:07:00 +02:00
abi.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
addrspace.h MIPS: Add NUMA support for Loongson-3 2014-07-30 21:46:19 +02:00
amon.h MIPS: APRP: Code formatting clean-ups. 2014-01-22 20:19:02 +01:00
arch_hweight.h
asm-eva.h MIPS: asm: Add wrappers for EVA/non-EVA instructions 2014-03-26 23:09:12 +01:00
asm-offsets.h
asm.h MIPS: Fix gigaton of warning building with microMIPS. 2014-03-31 18:17:12 +02:00
asmmacro-32.h MIPS: Don't assume 64-bit FP registers for context switch 2014-03-26 23:09:10 +01:00
asmmacro-64.h MIPS: Support for 64-bit FP with O32 binaries 2014-01-13 23:40:56 +01:00
asmmacro.h MIPS: Add microMIPS MSA support. 2014-06-04 22:50:41 +02:00
atomic.h arch,mips: Convert smp_mb__*() 2014-04-18 14:20:38 +02:00
barrier.h arch,mips: Convert smp_mb__*() 2014-04-18 14:20:38 +02:00
bcache.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
bitops.h MIPS: asm/bitops.h: Guard CLZ with `.set mips32' 2014-07-30 15:51:55 +02:00
bmips.h MIPS: BMIPS: add a smp ops registration helper 2014-01-22 20:18:52 +01:00
bootinfo.h MIPS: Loongson 3: Add Lemote-3A machtypes definition 2014-03-31 18:17:12 +02:00
branch.h MIPS: Sort out mm_isBranchInstr. 2014-05-23 15:12:37 +02:00
break.h MIPS: Quit exporting kernel internel break codes to uapi/asm/break.h 2013-02-20 18:24:24 +01:00
bug.h
bugs.h
cache.h MIPS: Rename .data..mostly and properly handle it in linker script 2011-05-10 18:15:24 +01:00
cacheflush.h MIPS: add kmap_noncoherent to wire a cached non-coherent TLB entry 2014-05-28 16:20:14 +01:00
cacheops.h MIPS: fix case mismatch in local_r4k_flush_icache_range() 2014-01-15 14:19:42 +07:00
cevt-r4k.h MIPS: MSP: Fix build error 2011-05-10 18:15:24 +01:00
checksum.h MIPS: asm: checksum: Add MIPS specific csum_and_copy_from_user function 2014-03-26 23:09:17 +01:00
clkdev.h clk: Add common __clk_get(), __clk_put() implementations 2013-12-04 17:19:44 +01:00
clock.h MIPS: clock.h: Remove declaration of cpu_wait. 2013-05-22 01:34:25 +02:00
cmp.h MIPS: SMP: Remove plat_smp_ops cpus_done method. 2014-05-27 11:06:42 +02:00
cmpxchg.h MIPS: Fix gigaton of warning building with microMIPS. 2014-03-31 18:17:12 +02:00
compat-signal.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
compat.h Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2013-03-02 07:44:16 -08:00
compiler.h
cop2.h MIPS: Loongson-3: Enable the COP2 usage 2014-07-30 21:47:17 +02:00
cpu-features.h MIPS: Don't use RI/XI with 32-bit kernels on 64-bit CPUs 2014-05-30 21:01:10 +02:00
cpu-info.h MIPS: Support CPU topology files in sysfs 2014-07-30 21:45:39 +02:00
cpu-type.h MIPS: OCTEON: Add OCTEON3 to __get_cpu_type 2014-05-30 21:01:11 +02:00
cpu.h MIPS: Add Loongson-3B support 2014-07-30 21:47:00 +02:00
debug.h
delay.h MIPS: Make __{,n,u}delay declarations match definitions and generic delay.h 2012-10-16 22:20:03 +02:00
device.h
div64.h
dma-coherence.h MIPS: improve checks for noncoherent DMA 2014-01-22 20:43:10 +01:00
dma-mapping.h MIPS: Loongson: Add swiotlb to support All-Memory DMA 2014-03-31 18:17:12 +02:00
dma.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
ds1287.h
dsp.h MIPS: DSP: Fix DSP mask for registers. 2013-01-24 13:20:09 +01:00
edac.h
elf.h MIPS: Support for 64-bit FP with O32 binaries 2014-01-13 23:40:56 +01:00
errno.h UAPI: (Scripted) Disintegrate arch/mips/include/asm 2012-10-09 09:47:14 +01:00
exec.h Disintegrate asm/system.h for MIPS 2012-03-28 18:30:02 +01:00
fb.h
fixmap.h MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
floppy.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
fpregdef.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
fpu_emulator.h MIPS: math-emu: Add IEEE754 exception statistics to debugfs 2014-05-30 11:55:23 +02:00
fpu.h MIPS: math-emu: Inline fpu_emulator_init_fpu() 2014-05-23 15:12:37 +02:00
ftrace.h MIPS: ftrace: Tweak safe_load()/safe_store() macros 2014-03-19 23:18:40 +01:00
futex.h MIPS: Fix gigaton of warning building with microMIPS. 2014-03-31 18:17:12 +02:00
gic.h MIPS: allow GIC clockevent device config from other CPUs 2014-05-02 16:39:11 +01:00
gio_device.h MIPS: IP22/IP28: Improve GIO support 2014-06-04 22:50:42 +02:00
gpio.h
gt64120.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
hardirq.h
hazards.h MIPS: Get rid of the use of .macro in C code. 2013-04-11 15:39:51 +02:00
highmem.h mips: delete non-required instances of include <linux/init.h> 2014-01-24 22:39:56 +01:00
hugetlb.h mm/hugetlb: add more arch-defined huge_pte functions 2013-04-29 15:54:33 -07:00
hw_irq.h atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
i8259.h
ide.h
idle.h MIPS: cpuidle wait instruction state 2014-05-28 16:20:34 +01:00
inst.h MIPS: MIPS16e: Support handling of delay slots. 2013-05-09 17:55:20 +02:00
io.h MIPS: Fix gigaton of warning building with microMIPS. 2014-03-31 18:17:12 +02:00
irq_cpu.h MIPS: add irqdomain support for the CPU IRQ controller 2013-02-17 01:25:34 +01:00
irq_gt641xx.h
irq_regs.h
irq.h MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
irqflags.h MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
isadep.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
jazz.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
jazzdma.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
jump_label.h compiler/gcc4: Add quirk for 'asm goto' miscompilation bug 2013-10-11 07:39:14 +02:00
Kbuild locking/mcs: Allow architecture specific asm files to be used for contended case 2014-02-09 21:18:52 +01:00
kdebug.h
kexec.h MIPS: kdump: Add support 2012-12-13 16:46:47 +01:00
kgdb.h
kmap_types.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
kprobes.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
kvm_host.h MIPS: KVM: Whitespace fixes in kvm_mips_callbacks 2014-05-30 13:05:07 +02:00
kvm_para.h MIPS: Add functions for hypervisor call 2014-05-30 21:01:11 +02:00
linkage.h consolidate cond_syscall and SYSCALL_ALIAS declarations 2013-03-03 22:55:19 -05:00
local.h MIPS: Fix gigaton of warning building with microMIPS. 2014-03-31 18:17:12 +02:00
m48t37.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
mc146818-time.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
mc146818rtc.h
mips_machine.h MIPS: move mips_{set,get}_machine_name() to a more generic place 2013-05-08 01:19:07 +02:00
mips_mt.h MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
mips-cm.h MIPS: CM: use __raw_ memory access functions 2014-03-31 18:17:13 +02:00
mips-cpc.h MIPS: CPC: provide locking functions 2014-05-02 16:39:14 +01:00
mipsmtregs.h MIPS: MT: define write_c0_tchalt macro 2014-05-28 16:20:22 +01:00
mipsprom.h MIPS: SNI: Fix conflicting wrapper symbols for headers. 2011-10-20 15:00:18 +01:00
mipsregs.h MIPS: Add function get_ebase_cpunum 2014-05-30 21:01:11 +02:00
mmu_context.h Merge branch 'wip-mips-pm' of https://github.com/paulburton/linux into mips-for-linux-next 2014-05-29 15:08:23 +02:00
mmu.h
mmzone.h
module.h MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
msa.h Merge branch '3.15-fixes' into mips-for-linux-next 2014-06-04 22:53:02 +02:00
msc01_ic.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
nile4.h mips: Update the email address of Geert Uytterhoeven 2014-06-02 16:34:41 +02:00
paccess.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
page.h MIPS: asm: page: Allow __pa_symbol overrides 2014-03-26 23:09:18 +01:00
pci.h PCI: Turn pcibios_penalize_isa_irq() into a weak function 2014-05-27 16:23:58 -06:00
perf_event.h
pgalloc.h mips: handle pgtable_page_ctor() fail 2013-11-15 09:32:18 +09:00
pgtable-32.h MIPS: BCM47XX: Detect more then 128 MiB of RAM (HIGHMEM) 2014-07-30 23:27:02 +02:00
pgtable-64.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
pgtable-bits.h MIPS: Loongson: Add basic Loongson-3 definition 2014-03-31 18:17:12 +02:00
pgtable.h MIPS: add kmap_noncoherent to wire a cached non-coherent TLB entry 2014-05-28 16:20:14 +01:00
pm-cps.h MIPS: pm-cps: add PM state entry code for CPS systems 2014-05-28 16:20:31 +01:00
pm.h Merge branch 'wip-mips-pm' of https://github.com/paulburton/linux into mips-for-linux-next 2014-05-29 15:08:23 +02:00
pmon.h
prefetch.h
processor.h MIPS: Basic MSA context switching support 2014-03-26 23:09:10 +01:00
prom.h mips: convert fdt pointers to opaque pointers 2014-04-30 00:59:13 -05:00
ptrace.h MIPS: O32/32-bit: Fix bug which can cause incorrect system call restarts 2014-08-02 00:06:37 +02:00
r4k-timer.h MIPS: Synchronize MIPS count one CPU at a time 2012-08-17 10:57:28 +02:00
r4kcache.h MIPS: Add minimal support for OCTEON3 to c-r4k.c 2014-05-30 21:01:10 +02:00
reboot.h
reg.h MIPS: asm/reg.h: Make 32- and 64-bit definitions available at the same time 2014-07-30 23:27:40 +02:00
regdef.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
rtlx.h MIPS: APRP: Code formatting clean-ups. 2014-01-22 20:19:02 +01:00
seccomp.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
setup.h MIPS: Add 8250/16550 serial early printk driver 2013-10-29 21:24:36 +01:00
sgialib.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
sgiarcs.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
shmparam.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
sigcontext.h Revert "MIPS: Save/restore MSA context around signals" 2014-06-26 10:48:18 +01:00
siginfo.h UAPI: (Scripted) Disintegrate arch/mips/include/asm 2012-10-09 09:47:14 +01:00
signal.h Fix breakage in MIPS siginfo handling 2013-03-19 19:15:52 +01:00
sim.h mips: switch to generic sys_fork() and sys_clone() 2013-02-03 18:33:02 -05:00
smp-cps.h MIPS: pm-cps: Prevent use of mips_cps_* without CPS SMP 2014-07-30 20:47:39 +02:00
smp-ops.h MIPS: SMP: Remove plat_smp_ops cpus_done method. 2014-05-27 11:06:42 +02:00
smp.h MIPS: Support CPU topology files in sysfs 2014-07-30 21:45:39 +02:00
sni.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
socket.h UAPI: (Scripted) Disintegrate arch/mips/include/asm 2012-10-09 09:47:14 +01:00
sparsemem.h MIPS: Add NUMA support for Loongson-3 2014-07-30 21:46:19 +02:00
spinlock_types.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
spinlock.h MIPS: Remove redundant instructions from arch_spin_{,try}lock. 2013-04-26 17:18:24 +02:00
spram.h
stackframe.h MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
stackprotector.h MIPS: initial stack protector support 2013-07-01 15:10:48 +02:00
stacktrace.h MIPS: Add new unwind_stack variant 2011-06-15 14:35:33 +02:00
string.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
suspend.h PM / Hibernate: Remove arch_prepare_suspend() 2011-05-24 23:35:55 +02:00
switch_to.h MIPS: Basic MSA context switching support 2014-03-26 23:09:10 +01:00
syscall.h MIPS: Add new AUDIT_ARCH token for the N32 ABI on MIPS64 2014-05-14 01:39:54 +02:00
termios.h UAPI: (Scripted) Disintegrate arch/mips/include/asm 2012-10-09 09:47:14 +01:00
thread_info.h MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
time.h MIPS: MT: Remove SMTC support 2014-05-24 00:07:01 +02:00
timex.h MIPS: Implement random_get_entropy with CP0 Random 2014-05-30 18:21:30 +02:00
tlb.h MIPS: tlb: Set the EHINV bit for TLBINVF cores when invalidating the TLB 2014-01-22 20:18:59 +01:00
tlbdebug.h
tlbflush.h
tlbmisc.h MIPS: Fix Jazz 64-bit build error. 2011-12-07 22:01:45 +00:00
topology.h sched: Remove unused mc_capable() and smt_capable() 2014-03-11 12:05:45 +01:00
traps.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
txx9irq.h
txx9pio.h
txx9tmr.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
types.h UAPI: (Scripted) Disintegrate arch/mips/include/asm 2012-10-09 09:47:14 +01:00
uaccess.h MIPS: asm: uaccess: Add EVA support for str*_user operations 2014-03-26 23:09:16 +01:00
uasm.h MIPS: uasm: Add SLT uasm instruction 2014-06-26 10:48:19 +01:00
unaligned.h
unistd.h sys_sgetmask/sys_ssetmask: add CONFIG_SGETMASK_SYSCALL 2014-06-04 16:54:14 -07:00
user.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
vdso.h
vga.h MIPS: Fix VGA_MAP_MEM macro. 2013-09-18 17:13:58 +02:00
vpe.h Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2014-01-30 17:20:32 -08:00
war.h MIPS: Whitespace cleanup. 2013-02-01 10:00:22 +01:00
watch.h
wbflush.h