Masami Hiramatsu 69af7e23a6 ARM: 8769/1: kprobes: Fix to use get_kprobe_ctlblk after irq-disabed ... Since get_kprobe_ctlblk() uses smp_processor_id() to access per-cpu variable, it hits smp_processor_id sanity check as below. [ 7.006928] BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1 [ 7.007859] caller is debug_smp_processor_id+0x20/0x24 [ 7.008438] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.16.0-rc1-00192-g4eb17253e4b5 #1 [ 7.008890] Hardware name: Generic DT based system [ 7.009917] [<c0313f0c>] (unwind_backtrace) from [<c030e6d8>] (show_stack+0x20/0x24) [ 7.010473] [<c030e6d8>] (show_stack) from [<c0c64694>] (dump_stack+0x84/0x98) [ 7.010990] [<c0c64694>] (dump_stack) from [<c071ca5c>] (check_preemption_disabled+0x138/0x13c) [ 7.011592] [<c071ca5c>] (check_preemption_disabled) from [<c071ca80>] (debug_smp_processor_id+0x20/0x24) [ 7.012214] [<c071ca80>] (debug_smp_processor_id) from [<c03335e0>] (optimized_callback+0x2c/0xe4) [ 7.013077] [<c03335e0>] (optimized_callback) from [<bf0021b0>] (0xbf0021b0) To fix this issue, call get_kprobe_ctlblk() right after irq-disabled since that disables preemption. Fixes: 0dc016dbd8 ("ARM: kprobes: enable OPTPROBES for ARM 32") Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: stable@vger.kernel.org Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>		2018-05-19 11:35:56 +01:00
..
actions-arm.c
actions-common.c
actions-thumb.c
checkers-arm.c
checkers-common.c
checkers-thumb.c
checkers.h
core.c	ARM: probes: avoid adding kprobes to sensitive kernel-entry/exit code	2017-12-17 22:14:21 +00:00
core.h
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
opt-arm.c	ARM: 8769/1: kprobes: Fix to use get_kprobe_ctlblk after irq-disabed	2018-05-19 11:35:56 +01:00
test-arm.c
test-core.c	arm/kprobes: Remove jprobe test case	2017-11-07 11:25:14 +01:00
test-core.h
test-thumb.c