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 |
|---|---|---|
| Kconfig | -rw-r--r-- | 10.5 KB |
| Makefile | -rw-r--r-- | 553 bytes |
| autosleep.c | -rw-r--r-- | 2.6 KB |
| console.c | -rw-r--r-- | 3.5 KB |
| energy_model.c | -rw-r--r-- | 5.2 KB |
| hibernate.c | -rw-r--r-- | 28.5 KB |
| main.c | -rw-r--r-- | 18.8 KB |
| power.h | -rw-r--r-- | 8.7 KB |
| poweroff.c | -rw-r--r-- | 990 bytes |
| process.c | -rw-r--r-- | 5.6 KB |
| qos.c | -rw-r--r-- | 18.8 KB |
| snapshot.c | -rw-r--r-- | 71.6 KB |
| suspend.c | -rw-r--r-- | 15.2 KB |
| suspend_test.c | -rw-r--r-- | 5.7 KB |
| swap.c | -rw-r--r-- | 37.6 KB |
| user.c | -rw-r--r-- | 10.2 KB |
| wakelock.c | -rw-r--r-- | 5.8 KB |
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