diff options
| author | Rémi Denis-Courmont <remi@remlab.net> | 2019-07-04 10:41:15 +0200 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2019-07-18 13:57:28 +0200 |
| commit | 0acd4ab849827bbc20402e01c9da088207c0d236 (patch) | |
| tree | 2d448ea155de3d8f39ff22424e038af0b7598668 /linux-user | |
| parent | 4ced996ffe3f08883fa5bd423bcfafdfd6f13189 (diff) | |
| download | focaccia-qemu-0acd4ab849827bbc20402e01c9da088207c0d236.tar.gz focaccia-qemu-0acd4ab849827bbc20402e01c9da088207c0d236.zip | |
linux-user: check valid address in access_ok()
Fix a crash with LTP testsuite and aarch64:
tst_test.c:1015: INFO: Timeout per run is 0h 05m 00s
qemu-aarch64: .../qemu/accel/tcg/translate-all.c:2522: page_check_range: Assertion `start < ((target_ulong)1 << L1_MAP_ADDR_SPACE_BITS)' failed.
qemu:handle_cpu_signal received signal outside vCPU context @ pc=0x60001554
page_check_range() should never be called with address outside the guest
address space. This patch adds a guest_addr_valid() check in access_ok()
to only call page_check_range() with a valid address.
Fixes: f6768aa1b4c6 ("target/arm: fix AArch64 virtual address space size")
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20190704084115.24713-1-lvivier@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/qemu.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/linux-user/qemu.h b/linux-user/qemu.h index fab287b7ec..4258e4162d 100644 --- a/linux-user/qemu.h +++ b/linux-user/qemu.h @@ -456,7 +456,9 @@ 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) && + (size == 0 || guest_addr_valid(addr + size - 1)) && + page_check_range((target_ulong)addr, size, (type == VERIFY_READ) ? PAGE_READ : (PAGE_READ | PAGE_WRITE)) == 0; } |