linux/arch/parisc
Sven Schnelle 3ec18fc783 parisc/entry: fix trace test in syscall exit path
commit 8779e05ba8 ("parisc: Fix ptrace check on syscall return")
fixed testing of TI_FLAGS. This uncovered a bug in the test mask.
syscall_restore_rfi is only used when the kernel needs to exit to
usespace with single or block stepping and the recovery counter
enabled. The test however used _TIF_SYSCALL_TRACE_MASK, which
includes a lot of bits that shouldn't be tested here.

Fix this by using TIF_SINGLESTEP and TIF_BLOCKSTEP directly.

I encountered this bug by enabling syscall tracepoints. Both in qemu and
on real hardware. As soon as i enabled the tracepoint (sys_exit_read,
but i guess it doesn't really matter which one), i got random page
faults in userspace almost immediately.

Signed-off-by: Sven Schnelle <svens@stackframe.org>
Signed-off-by: Helge Deller <deller@gmx.de>
2021-11-13 22:10:56 +01:00
..
boot parisc: decompressor: clean up Makefile 2021-11-01 07:36:01 +01:00
configs parisc: Update defconfigs 2021-11-01 07:36:02 +01:00
include parisc: Flush kernel data mapping in set_pte_at() when installing pte for user page 2021-11-13 22:10:56 +01:00
kernel parisc/entry: fix trace test in syscall exit path 2021-11-13 22:10:56 +01:00
lib parisc: mark xchg functions notrace 2021-11-01 07:36:00 +01:00
math-emu parisc: math-emu: Fix fall-through warnings 2021-09-01 22:18:18 +02:00
mm parisc: Fix set_fixmap() on PA1.x CPUs 2021-11-01 12:00:22 +01:00
defpalo.conf
install.sh parisc: Install vmlinuz instead of zImage file 2020-10-15 08:10:39 +02:00
Kbuild kbuild: use more subdir- for visiting subdirectories while cleaning 2021-10-24 13:49:46 +09:00
Kconfig parisc: Move thread_info into task struct 2021-11-01 07:35:59 +01:00
Kconfig.debug tracing: Refactor TRACE_IRQFLAGS_SUPPORT in Kconfig 2021-08-16 11:37:21 -04:00
Makefile kbuild: use more subdir- for visiting subdirectories while cleaning 2021-10-24 13:49:46 +09:00
nm