From 251adb595eb7e39e9368cb7ed07f9a4c42d28d2c Mon Sep 17 00:00:00 2001 From: Jon Maloy Date: Wed, 21 Apr 2021 22:30:06 -0400 Subject: [PATCH 7/8] softmmu/memory: Log invalid memory accesses MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Jon Maloy Message-id: <20210421223006.19650-7-jmaloy@redhat.com> Patchwork-id: 101481 O-Subject: [RHEL-8.5.0 qemu-kvm PATCH v2 6/6] softmmu/memory: Log invalid memory accesses Bugzilla: 1944621 RH-Acked-by: Stefano Garzarella RH-Acked-by: Philippe Mathieu-Daudé RH-Acked-by: Laszlo Ersek From: Philippe Mathieu-Daudé Log invalid memory accesses with as GUEST_ERROR. This is particularly useful since commit 5d971f9e67 which reverted ("memory: accept mismatching sizes in memory_region_access_valid"). Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Michael S. Tsirkin Message-Id: <20201005152725.2143444-1-philmd@redhat.com> Signed-off-by: Laurent Vivier (cherry picked from commit 21786c7e59847b1612406ff394958f22e5b323f8) Signed-off-by: Jon Maloy Signed-off-by: Danilo C. L. de Paula --- memory.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/memory.c b/memory.c index 0cfcb72a5a..660df8159a 100644 --- a/memory.c +++ b/memory.c @@ -14,6 +14,7 @@ */ #include "qemu/osdep.h" +#include "qemu/log.h" #include "qapi/error.h" #include "cpu.h" #include "exec/memory.h" @@ -1353,10 +1354,18 @@ bool memory_region_access_valid(MemoryRegion *mr, { if (mr->ops->valid.accepts && !mr->ops->valid.accepts(mr->opaque, addr, size, is_write, attrs)) { + qemu_log_mask(LOG_GUEST_ERROR, "Invalid access at addr " + "0x%" HWADDR_PRIX ", size %u, " + "region '%s', reason: rejected\n", + addr, size, memory_region_name(mr)); return false; } if (!mr->ops->valid.unaligned && (addr & (size - 1))) { + qemu_log_mask(LOG_GUEST_ERROR, "Invalid access at addr " + "0x%" HWADDR_PRIX ", size %u, " + "region '%s', reason: unaligned\n", + addr, size, memory_region_name(mr)); return false; } @@ -1367,6 +1376,13 @@ bool memory_region_access_valid(MemoryRegion *mr, if (size > mr->ops->valid.max_access_size || size < mr->ops->valid.min_access_size) { + qemu_log_mask(LOG_GUEST_ERROR, "Invalid access at addr " + "0x%" HWADDR_PRIX ", size %u, " + "region '%s', reason: invalid size " + "(min:%u max:%u)\n", + addr, size, memory_region_name(mr), + mr->ops->valid.min_access_size, + mr->ops->valid.max_access_size); return false; } return true; -- 2.27.0