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[V5,20/22] xen/arm: io: Harden sign extension check

Message ID 1611601709-28361-21-git-send-email-olekstysh@gmail.com (mailing list archive)
State Superseded
Headers show
Series IOREQ feature (+ virtio-mmio) on Arm | expand

Commit Message

Oleksandr Tyshchenko Jan. 25, 2021, 7:08 p.m. UTC 
From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>

In the ideal world we would never get an undefined behavior when
propagating the sign bit since that bit can only be set for access
size smaller than the register size (i.e byte/half-word for aarch32,
byte/half-word/word for aarch64).

In the real world we need to care for *possible* hardware bug such as
advertising a sign extension for either 64-bit (or 32-bit) on Arm64
(resp. Arm32).

So harden a bit more the code to prevent undefined behavior when
propagating the sign bit in case of buggy hardware.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
CC: Julien Grall <julien.grall@arm.com>

---
Please note, this is a split/cleanup/hardening of Julien's PoC:
"Add support for Guest IO forwarding to a device emulator"

Changes V3 -> V4:
   - new patch

Changes V4 -> V5:
   - add Stefano's and Volodymyr's R-b
---
---
 xen/include/asm-arm/traps.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/xen/include/asm-arm/traps.h b/xen/include/asm-arm/traps.h
index c6b3cc7..2ed2b85 100644
--- a/xen/include/asm-arm/traps.h
+++ b/xen/include/asm-arm/traps.h
@@ -94,7 +94,8 @@  static inline register_t sign_extend(const struct hsr_dabt dabt, register_t r)
      * Note that we expect the read handler to have zeroed the bits
      * outside the requested access size.
      */
-    if ( dabt.sign && (r & (1UL << (size - 1))) )
+    if ( dabt.sign && (size < sizeof(register_t) * 8) &&
+         (r & (1UL << (size - 1))) )
     {
         /*
          * We are relying on register_t using the same as