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5af2ed3669
linux/arch/mips
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James Cowgill 5af2ed3669 MIPS: Remove pt_regs adjustments in indirect syscall handler 
If a restartable syscall is called using the indirect o32 syscall
handler - eg: syscall(__NR_waitid, ...), then it is possible for the
incorrect arguments to be passed to the syscall after it has been
restarted. This is because the syscall handler tries to shift all the
registers down one place in pt_regs so that when the syscall is restarted,
the "real" syscall is called instead. Unfortunately it only shifts the
arguments passed in registers, not the arguments on the user stack. This
causes the 4th argument to be duplicated when the syscall is restarted.

Fix by removing all the pt_regs shifting so that the indirect syscall
handler is called again when the syscall is restarted. The comment "some
syscalls like execve get their arguments from struct pt_regs" is long
out of date so this should now be safe.

Signed-off-by: James Cowgill <James.Cowgill@imgtec.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Tested-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/15856/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2017-08-29 15:48:34 +02:00
..
alchemy MIPS: clockevent drivers: Set ->min_delta_ticks and ->max_delta_ticks 2017-04-14 13:11:16 -07:00
ar7 MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
ath25
ath79 gpio: pcf857x: move header file out of I2C realm 2017-05-23 11:35:02 +02:00
bcm47xx MIPS: BCM47XX: Fix button inversion for Asus WL-500W 2017-02-17 11:16:46 +00:00
bcm63xx MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
bmips MIPS: BMIPS: Support APPENDED_DTB 2016-10-06 17:31:02 +02:00
boot MIPS: gitignore: ignore generated .c files 2017-08-07 11:57:30 +02:00
cavium-octeon MIPS: OCTEON: Fix USB platform code breakage. 2017-08-07 11:59:53 +02:00
cobalt MIPS: Cobalt: Fix typo 2016-08-03 08:16:30 +02:00
configs MIPS: generic: Support MIPS Boston development boards 2017-07-11 14:13:06 +02:00
dec MIPS: DEC: Fix an int-handler.S CPU_DADDI_WORKAROUNDS regression 2017-08-07 16:31:03 +02:00
emma MIPS: Avoid old-style declaration 2017-01-25 02:51:11 +01:00
fw
generic Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-07-15 10:59:54 -07:00
include MIPS: Introduce cpu_tcache_line_size 2017-08-08 00:02:27 +02:00
jazz MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
jz4740 MIPS: jz4740: Remove custom GPIO code 2017-05-22 17:26:34 +02:00
kernel MIPS: Remove pt_regs adjustments in indirect syscall handler 2017-08-29 15:48:34 +02:00
kvm PPC: 2017-07-06 18:38:31 -07:00
lantiq clk: Provide dummy of_clk_get_from_provider() for compile-testing 2017-06-02 10:51:34 -07:00
lasat MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
lib Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-07-15 10:59:54 -07:00
loongson32 MIPS: clockevent drivers: Set ->min_delta_ticks and ->max_delta_ticks 2017-04-14 13:11:16 -07:00
loongson64 Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-07-15 10:59:54 -07:00
math-emu Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2017-07-15 10:59:54 -07:00
mm MIPS: mm: remove duplicate "const" qualifier on insn_table 2017-08-07 11:57:30 +02:00
mti-malta clocksource/drivers: Rename clocksource_probe to timer_probe 2017-06-14 11:59:16 +02:00
net MIPS: Add missing file for eBPF JIT. 2017-08-04 11:23:58 -07:00
netlogic MIPS: Add missing include files 2017-03-08 10:38:06 +01:00
oprofile mips: sanitize __access_ok() 2017-04-06 02:08:06 -04:00
paravirt sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
pci MIPS: PCI: Fix smp_processor_id() in preemptible 2017-08-08 00:04:31 +02:00
pic32 clocksource/drivers: Rename clocksource_probe to timer_probe 2017-06-14 11:59:16 +02:00
pistachio clocksource/drivers: Rename clocksource_probe to timer_probe 2017-06-14 11:59:16 +02:00
pmcs-msp71xx MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
pnx833x MIPS: Squash lines for simple wrapper functions 2016-10-04 16:13:57 +02:00
power
ralink MIPS: ralink: mt7620: Add missing header 2017-07-19 00:03:15 +02:00
rb532 MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
sgi-ip22 mips: sgi-ip22: ecard: use dev_groups and not dev_attrs for bus_type 2017-06-09 11:00:45 +02:00
sgi-ip27 MIPS: clockevent drivers: Set ->min_delta_ticks and ->max_delta_ticks 2017-04-14 13:11:16 -07:00
sgi-ip32 MIPS: Add missing include files 2017-03-08 10:38:06 +01:00
sibyte MIPS: Sibyte: Export symbol periph_rev to sb1250-mac network driver. 2017-04-21 03:23:24 +02:00
sni
txx9 MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
vdso MIPS: VDSO: Fix clobber lists in fallback code paths 2017-08-07 13:53:25 +02:00
vr41xx MIPS: Audit and remove any unnecessary uses of module.h 2017-02-14 09:00:25 +00:00
xilfpga clocksource/drivers: Rename clocksource_probe to timer_probe 2017-06-14 11:59:16 +02:00
Kbuild MIPS: Disable Werror when W= is set 2017-04-10 11:56:07 +02:00
Kbuild.platforms MIPS: generic: Convert SEAD-3 to a generic board 2016-10-06 18:04:20 +02:00
Kconfig MIPS: Prevent building MT support for microMIPS kernels 2017-08-08 13:57:10 +02:00
Kconfig.debug MIPS: Sibyte: Fix Kconfig warning. 2017-04-21 03:34:01 +02:00
Makefile MIPS: Set ISA bit in entry-y for microMIPS kernels 2017-08-08 14:00:50 +02:00
Makefile.postlink MIPS: Fix distclean with Makefile.postlink 2017-02-13 18:57:34 +00:00