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| author | Marc-André Lureau <marcandre.lureau@redhat.com> | 2018-03-09 17:09:44 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2018-03-09 17:09:44 +0000 |
| commit | 2764040785b3400e3aafab74b8448ad24e8ae14d (patch) | |
| tree | cc231ccba0c02e142ecc57e6e39ebf37b0f1a2ca /hw/arm | |
| parent | 36f876cea4947417c14c2f0798f1db374a4e8bea (diff) | |
| download | qemu-2764040785b3400e3aafab74b8448ad24e8ae14d.zip | |
arm: avoid heap-buffer-overflow in load_aarch64_image
Spotted by ASAN:
elmarco@boraha:~/src/qemu/build (master *%)$ QTEST_QEMU_BINARY=aarch64-softmmu/qemu-system-aarch64 tests/boot-serial-test
/aarch64/boot-serial/virt: ** (process:19740): DEBUG: 18:39:30.275: foo /tmp/qtest-boot-serial-cXaS94D
=================================================================
==19740==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x603000069648 at pc 0x7f1d2201cc54 bp 0x7fff331f6a40 sp 0x7fff331f61e8
READ of size 4 at 0x603000069648 thread T0
#0 0x7f1d2201cc53 (/lib64/libasan.so.4+0xafc53)
#1 0x55bc86685ee3 in load_aarch64_image /home/elmarco/src/qemu/hw/arm/boot.c:894
#2 0x55bc86687217 in arm_load_kernel_notify /home/elmarco/src/qemu/hw/arm/boot.c:1047
#3 0x55bc877363b5 in notifier_list_notify /home/elmarco/src/qemu/util/notify.c:40
#4 0x55bc869331ea in qemu_run_machine_init_done_notifiers /home/elmarco/src/qemu/vl.c:2716
#5 0x55bc8693bc39 in main /home/elmarco/src/qemu/vl.c:4679
#6 0x7f1d1652c009 in __libc_start_main (/lib64/libc.so.6+0x21009)
#7 0x55bc86255cc9 in _start (/home/elmarco/src/qemu/build/aarch64-softmmu/qemu-system-aarch64+0x1ae5cc9)
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/arm')
| -rw-r--r-- | hw/arm/boot.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/hw/arm/boot.c b/hw/arm/boot.c index 784d301683..196c7fb242 100644 --- a/hw/arm/boot.c +++ b/hw/arm/boot.c @@ -891,7 +891,8 @@ static uint64_t load_aarch64_image(const char *filename, hwaddr mem_base, } /* check the arm64 magic header value -- very old kernels may not have it */ - if (memcmp(buffer + ARM64_MAGIC_OFFSET, "ARM\x64", 4) == 0) { + if (size > ARM64_MAGIC_OFFSET + 4 && + memcmp(buffer + ARM64_MAGIC_OFFSET, "ARM\x64", 4) == 0) { uint64_t hdrvals[2]; /* The arm64 Image header has text_offset and image_size fields at 8 and |