diff options
Diffstat (limited to 'results/classifier/deepseek-2-tmp/output/permissions/1779955')
| -rw-r--r-- | results/classifier/deepseek-2-tmp/output/permissions/1779955 | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/results/classifier/deepseek-2-tmp/output/permissions/1779955 b/results/classifier/deepseek-2-tmp/output/permissions/1779955 new file mode 100644 index 000000000..bc711e54b --- /dev/null +++ b/results/classifier/deepseek-2-tmp/output/permissions/1779955 @@ -0,0 +1,31 @@ + +qemu linux-user requires read permissions on memory passed to syscalls that should only need write access + +When read() function takes an mmap'ed address as output buffer, it returns EFAULT. The expected behavior is it should just work. + +The following code works for qemu-system-arm, but not for qemu-arm-static. + + + +Steps to reproduce (please substitute /path/to/qemu-arm-static with the path of the binary, and /tmp/a.cpp with the example source code attached): + +# First register binfmt_misc +[hidden]$ docker run --rm --privileged multiarch/qemu-user-static:register --reset + +# Compile the code and run +[hidden]$ docker run --rm -it -v /tmp/a.cpp:/tmp/a.cpp -v /path/to/qemu-arm-static:/usr/bin/qemu-arm-static arm32v7/ubuntu:18.04 bash -c '{ apt update -y && apt install -y g++; } >& /dev/null && g++ -std=c++14 /tmp/a.cpp -o /tmp/a.out && echo hehe > /tmp/haha.txt && /tmp/a.out' +ofd=3 +ftruncate=0 +mmap=0xff3f5000 +fd=4 +0xff3f5023 -1 14 + + + +The expected result in qemu-system-arm as well as natively on x86_64 host: +hidden$ ./a.out +ofd=3 +ftruncate=0 +mmap=0xb6fb7000 +fd=4 +0xb6fb7023 5 0 \ No newline at end of file |