Commits
Helge Deller committed 59a783dbc0d
parisc: Avoid kernel panic triggered by invalid kprobe
When running gdb I was able to trigger this kernel panic:
Kernel Fault: Code=26 (Data memory access rights trap) at addr 0000000000000060
CPU: 0 PID: 1401 Comm: gdb-crash Not tainted 5.2.0-rc7-64bit+ #1053
YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
PSW: 00001000000001000000000000001111 Not tainted
r00-03 000000000804000f 0000000040dee1a0 0000000040c78cf0 00000000b8d50160
r04-07 0000000040d2b1a0 000000004360a098 00000000bbbe87b8 0000000000000003
r08-11 00000000fac20a70 00000000fac24160 00000000fac1bbe0 0000000000000000
r12-15 00000000fabfb79a 00000000fac244a4 0000000000010000 0000000000000001
r16-19 00000000bbbe87b8 00000000f8f02910 0000000000010034 0000000000000000
r20-23 00000000fac24630 00000000fac24630 000000006474e552 00000000fac1aa52
r24-27 0000000000000028 00000000bbbe87b8 00000000bbbe87b8 0000000040d2b1a0
r28-31 0000000000000000 00000000b8d501c0 00000000b8d501f0 0000000003424000
sr00-03 0000000000423000 0000000000000000 0000000000000000 0000000000423000
sr04-07 0000000000000000 0000000000000000 0000000000000000 0000000000000000
IASQ: 0000000000000000 0000000000000000 IAOQ: 0000000040c78cf0 0000000040c78cf4
IIR: 539f00c0 ISR: 0000000000000000 IOR: 0000000000000060
CPU: 0 CR30: 00000000b8d50000 CR31: 00000000d22345e2
ORIG_R28: 0000000040250798
IAOQ[0]: parisc_kprobe_ss_handler+0x58/0x170
IAOQ[1]: parisc_kprobe_ss_handler+0x5c/0x170
RP(r2): parisc_kprobe_ss_handler+0x58/0x170
Backtrace:
[<0000000040206ff8>] handle_interruption+0x178/0xbb8
Kernel panic - not syncing: Kernel Fault
Avoid this panic by checking the return value of kprobe_running() and
skip kprobe if none is currently active.
Cc: <stable@vger.kernel.org> # v5.2
Acked-by: Sven Schnelle <svens@stackframe.org>
Tested-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: Helge Deller <deller@gmx.de>