Finn Thain f7d19a366c m68k: Move signal frame following exception on 68020/030 ... commit b845b574f8 upstream. On 68030/020, an instruction such as, moveml %a2-%a3/%a5,%sp@- may cause a stack page fault during instruction execution (i.e. not at an instruction boundary) and produce a format 0xB exception frame. In this situation, the value of USP will be unreliable. If a signal is to be delivered following the exception, this USP value is used to calculate the location for a signal frame. This can result in a corrupted user stack. The corruption was detected in dash (actually in glibc) where it showed up as an intermittent "stack smashing detected" message and crash following signal delivery for SIGCHLD. It was hard to reproduce that failure because delivery of the signal raced with the page fault and because the kernel places an unpredictable gap of up to 7 bytes between the USP and the signal frame. A format 0xB exception frame can be produced by a bus error or an address error. The 68030 Users Manual says that address errors occur immediately upon detection during instruction prefetch. The instruction pipeline allows prefetch to overlap with other instructions, which means an address error can arise during the execution of a different instruction. So it seems likely that this patch may help in the address error case also. Reported-and-tested-by: Stan Johnson <userm57@yahoo.com> Link: https://lore.kernel.org/all/CAMuHMdW3yD22_ApemzW_6me3adq6A458u1_F0v-1EYwK_62jPA@mail.gmail.com/ Cc: Michael Schmitz <schmitzmic@gmail.com> Cc: Andreas Schwab <schwab@linux-m68k.org> Cc: stable@vger.kernel.org Co-developed-by: Michael Schmitz <schmitzmic@gmail.com> Signed-off-by: Michael Schmitz <schmitzmic@gmail.com> Signed-off-by: Finn Thain <fthain@linux-m68k.org> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org> Link: https://lore.kernel.org/r/9e66262a754fcba50208aa424188896cc52a1dd1.1683365892.git.fthain@linux-m68k.org Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-05-30 12:44:09 +01:00
..
68000	m68k: Check syscall_trace_enter() return code	2023-03-11 16:43:55 +01:00
amiga
apollo
atari
bvme6000
coldfire	m68k: Check syscall_trace_enter() return code	2023-03-11 16:43:55 +01:00
configs
emu	m68k: emu: Fix invalid free in nfeth_cleanup()	2021-09-15 09:47:28 +02:00
fpsp040
hp300
ifpsp060
include	m68k: use fallback for random_get_entropy() instead of zero	2022-06-22 14:11:15 +02:00
kernel	m68k: Move signal frame following exception on 68020/030	2023-05-30 12:44:09 +01:00
lib
mac
math-emu
mm	exit: Add and use make_task_dead.	2023-02-06 07:52:49 +01:00
mvme16x
mvme147
q40
sun3
sun3x
tools/amiga
install.sh
Kconfig
Kconfig.bus	m68knommu: only set CONFIG_ISA_DMA_API for ColdFire sub-arch	2021-09-22 12:26:34 +02:00
Kconfig.cpu	m68k: math-emu: Fix dependencies of math emulation support	2022-06-14 18:11:37 +02:00
Kconfig.debug
Kconfig.devices	m68k: /proc/hardware should depend on PROC_FS	2023-03-11 16:43:41 +01:00
Kconfig.machine	m68knommu: fix undefined reference to `_init_sp'	2022-06-14 18:11:56 +02:00
Makefile