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[Qemu-devel] [PATCH] linux-user: check valid address in access_ok()
From: |
Rémi Denis-Courmont |
Subject: |
[Qemu-devel] [PATCH] linux-user: check valid address in access_ok() |
Date: |
Fri, 8 Feb 2019 19:35:20 +0200 |
This works around the LTP crash, but there are problably better ways to
go about it.
Signed-off-by: Rémi Denis-Courmont <address@hidden>
Cc: <address@hidden>
---
linux-user/qemu.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/linux-user/qemu.h b/linux-user/qemu.h
index ef400cb78a..1d222a0cce 100644
--- a/linux-user/qemu.h
+++ b/linux-user/qemu.h
@@ -457,7 +457,8 @@ extern unsigned long guest_stack_size;
static inline int access_ok(int type, abi_ulong addr, abi_ulong size)
{
- return page_check_range((target_ulong)addr, size,
+ return guest_addr_valid(addr) && guest_addr_valid(addr + size) &&
+ page_check_range((target_ulong)addr, size,
(type == VERIFY_READ) ? PAGE_READ : (PAGE_READ |
PAGE_WRITE)) == 0;
}
--
2.20.1
- [Qemu-devel] [PATCH] linux-user: check valid address in access_ok(),
Rémi Denis-Courmont <=