Will Deacon 24ebec25fb arm64: hw_breakpoint: Don't invoke overflow handler on uaccess watchpoints ... Unprivileged memory accesses generated by the so-called "translated" instructions (e.g. STTR) at EL1 can cause EL0 watchpoints to fire unexpectedly if kernel debugging is enabled. In such cases, the hw_breakpoint logic will invoke the user overflow handler which will typically raise a SIGTRAP back to the current task. This is futile when returning back to the kernel because (a) the signal won't have been delivered and (b) userspace can't handle the thing anyway. Avoid invoking the user overflow handler for watchpoints triggered by kernel uaccess routines, and instead single-step over the faulting instruction as we would if no overflow handler had been installed. (Fixes tag identifies the introduction of unprivileged memory accesses, which exposed this latent bug in the hw_breakpoint code) Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Fixes: 57f4959bad ("arm64: kernel: Add support for User Access Override") Reported-by: Luis Machado <luis.machado@linaro.org> Signed-off-by: Will Deacon <will@kernel.org>		2020-06-18 11:10:00 +01:00
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boot
configs
crypto
include	arm64: pgtable: Clear the GP bit for non-executable kernel pages	2020-06-16 17:21:07 +01:00
kernel	arm64: hw_breakpoint: Don't invoke overflow handler on uaccess watchpoints	2020-06-18 11:10:00 +01:00
kvm
lib
mm	arm64: mm: reserve hugetlb CMA after numa_init	2020-06-18 10:39:15 +01:00
net
xen
Kbuild
Kconfig	arm64: bti: Require clang >= 10.0.1 for in-kernel BTI support	2020-06-17 11:18:58 +01:00
Kconfig.debug
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