Nicholas Piggin 00ff1eaac1 powerpc: Fix reschedule bug in KUAP-unlocked user copy ... schedule must not be explicitly called while KUAP is unlocked, because the AMR register will not be saved across the context switch on 64s (preemption is allowed because that is driven by interrupts which do save the AMR). exit_vmx_usercopy() runs inside an unlocked user access region, and it calls preempt_enable() which will call schedule() if need_resched() was set while non-preemptible. This can cause tasks to run unprotected when the should not, and can cause the user copy to be improperly blocked when scheduling back to it. Fix this by avoiding the explicit resched for preempt kernels by generating an interrupt to reschedule the context if need_resched() got set. Reported-by: Samuel Holland <samuel@sholland.org> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Tested-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20221013151647.1857994-3-npiggin@gmail.com		2022-10-18 22:46:19 +11:00
..
alloc.c	treewide: add checks for the return value of memblock_alloc*()	2019-03-12 10:04:02 -07:00
checksum_32.S	powerpc/32: Remove remaining .stabs annotations	2022-02-07 21:03:10 +11:00
checksum_64.S	ppc: propagate the calling conventions change down to csum_partial_copy_generic()	2020-08-20 15:45:22 -04:00
checksum_wrappers.c	net: unexport csum_and_copy_{from,to}_user	2022-04-29 14:37:59 -07:00
code-patching.c	powerpc/code-patching: Speed up page mapping/unmapping	2022-09-01 13:56:01 +10:00
copy_32.S	powerpc/32: Remove remaining .stabs annotations	2022-02-07 21:03:10 +11:00
copy_mc_64.S	x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}()	2020-10-06 11:18:04 +02:00
copypage_64.S	powerpc/64: asm use consistent global variable declaration and access	2022-09-28 19:22:12 +10:00
copypage_power7.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156	2019-05-30 11:26:35 -07:00
copyuser_64.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
copyuser_power7.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156	2019-05-30 11:26:35 -07:00
crtsavres.S	powerpc/64: Do not create new section for save/restore functions	2017-05-30 14:59:51 +10:00
div64.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
error-inject.c	powerpc/64s: avoid reloading (H)SRR registers if they are still valid	2021-06-25 00:06:55 +10:00
feature-fixups-test.S	powerpc: Test prefixed instructions in feature fixups	2020-05-19 00:11:02 +10:00
feature-fixups.c	powerpc: Remove CONFIG_PPC_FSL_BOOK3E	2022-09-26 23:00:13 +10:00
hweight_64.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156	2019-05-30 11:26:35 -07:00
ldstfp.S	powerpc updates for 5.3	2019-07-13 16:08:36 -07:00
locks.c	powerpc/pseries: Move some PAPR paravirt functions to their own file	2020-07-26 23:34:26 +10:00
Makefile	powerpc/kasan: Don't instrument non-maskable or raw interrupts	2022-05-22 15:58:29 +10:00
mem_64.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
memcmp_32.S	powerpc/lib: optimise PPC32 memcmp	2018-06-04 00:39:21 +10:00
memcmp_64.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
memcpy_64.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
memcpy_power7.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156	2019-05-30 11:26:35 -07:00
pmem.c	powerpc/pmem: Include pmem prototypes	2021-01-30 11:39:28 +11:00
quad.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
restart_table.c	powerpc/64s: add a table of implicit soft-masked addresses	2021-06-30 22:21:20 +10:00
rheap.c	treewide: kmalloc() -> kmalloc_array()	2018-06-12 16:19:22 -07:00
sstep.c	powerpc/64: remove system call instruction emulation	2022-05-06 00:00:20 +10:00
string_32.S	powerpc: Fix __clear_user() with KUAP enabled	2019-12-16 23:19:44 +11:00
string_64.S	powerpc/64: asm use consistent global variable declaration and access	2022-09-28 19:22:12 +10:00
string.S	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
strlen_32.S	powerpc/lib: Implement strlen() in assembly for PPC32	2018-08-07 21:49:30 +10:00
test_emulate_step_exec_instr.S	powerpc: flexible GPR range save/restore macros	2021-11-29 23:15:20 +11:00
test_emulate_step.c	powerpc/ppc-opcode: Define and use PPC_RAW_SETB()	2022-07-27 21:36:05 +10:00
test-code-patching.c	powerpc/code-patching: Replace patch_instruction() by ppc_inst_write() in selftests	2021-12-23 22:36:58 +11:00
vmx-helper.c	powerpc: Fix reschedule bug in KUAP-unlocked user copy	2022-10-18 22:46:19 +11:00
xor_vmx_glue.c	lib/xor: make xor prototypes more friendly to compiler vectorization	2022-02-11 20:39:39 +11:00
xor_vmx.c	lib/xor: make xor prototypes more friendly to compiler vectorization	2022-02-11 20:39:39 +11:00
xor_vmx.h	lib/xor: make xor prototypes more friendly to compiler vectorization	2022-02-11 20:39:39 +11:00