https://github.com/torvalds/linux
Revision f2b3d8566d81deaca31f4e3163def0bea7746e11 authored by James Morse on 24 January 2019, 16:32:55 UTC, committed by Will Deacon on 01 February 2019, 14:09:50 UTC
On systems with VHE the kernel and KVM's world-switch code run at the
same exception level. Code that is only used on a VHE system does not
need to be annotated as __hyp_text as it can reside anywhere in the
kernel text.
__hyp_text was also used to prevent kprobes from patching breakpoint
instructions into this region, as this code runs at a different
exception level. While this is no longer true with VHE, KVM still
switches VBAR_EL1, meaning a kprobe's breakpoint executed in the
world-switch code will cause a hyp-panic.
Move the __hyp_text check in the kprobes blacklist so it applies on
VHE systems too, to cover the common code and guest enter/exit
assembly.
Fixes: 888b3c8720e0 ("arm64: Treat all entry code as non-kprobe-able")
Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
1 parent 8ea2359
Tip revision: f2b3d8566d81deaca31f4e3163def0bea7746e11 authored by James Morse on 24 January 2019, 16:32:55 UTC
arm64: kprobe: Always blacklist the KVM world-switch code
arm64: kprobe: Always blacklist the KVM world-switch code
Tip revision: f2b3d85
| File | Mode | Size |
|---|---|---|
| Makefile | -rw-r--r-- | 1.2 KB |
| lockdep.c | -rw-r--r-- | 108.9 KB |
| lockdep_internals.h | -rw-r--r-- | 5.7 KB |
| lockdep_proc.c | -rw-r--r-- | 16.7 KB |
| lockdep_states.h | -rw-r--r-- | 207 bytes |
| locktorture.c | -rw-r--r-- | 28.3 KB |
| mcs_spinlock.h | -rw-r--r-- | 3.7 KB |
| mutex-debug.c | -rw-r--r-- | 2.7 KB |
| mutex-debug.h | -rw-r--r-- | 1.1 KB |
| mutex.c | -rw-r--r-- | 36.6 KB |
| mutex.h | -rw-r--r-- | 841 bytes |
| osq_lock.c | -rw-r--r-- | 5.6 KB |
| percpu-rwsem.c | -rw-r--r-- | 5.1 KB |
| qrwlock.c | -rw-r--r-- | 2.8 KB |
| qspinlock.c | -rw-r--r-- | 16.3 KB |
| qspinlock_paravirt.h | -rw-r--r-- | 16.1 KB |
| qspinlock_stat.h | -rw-r--r-- | 7.9 KB |
| rtmutex-debug.c | -rw-r--r-- | 4.6 KB |
| rtmutex-debug.h | -rw-r--r-- | 1.4 KB |
| rtmutex.c | -rw-r--r-- | 50.1 KB |
| rtmutex.h | -rw-r--r-- | 1.2 KB |
| rtmutex_common.h | -rw-r--r-- | 4.2 KB |
| rwsem-spinlock.c | -rw-r--r-- | 7.7 KB |
| rwsem-xadd.c | -rw-r--r-- | 20.1 KB |
| rwsem.c | -rw-r--r-- | 4.5 KB |
| rwsem.h | -rw-r--r-- | 4.3 KB |
| semaphore.c | -rw-r--r-- | 7.3 KB |
| spinlock.c | -rw-r--r-- | 9.5 KB |
| spinlock_debug.c | -rw-r--r-- | 5.5 KB |
| test-ww_mutex.c | -rw-r--r-- | 12.9 KB |
Computing file changes ...
