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Diffstat (limited to 'results/classifier/mode-deepseek-r1:32b/reasoning/user/1783362')
| -rw-r--r-- | results/classifier/mode-deepseek-r1:32b/reasoning/user/1783362 | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/results/classifier/mode-deepseek-r1:32b/reasoning/user/1783362 b/results/classifier/mode-deepseek-r1:32b/reasoning/user/1783362 new file mode 100644 index 00000000..ecd72afd --- /dev/null +++ b/results/classifier/mode-deepseek-r1:32b/reasoning/user/1783362 @@ -0,0 +1,17 @@ +<think> +Okay, I'm trying to figure out whether this bug report about QEMU is user-mode or system-mode related. The issue is that when using mmap with a length of 0 in an aarch64 binary running under qemu-user on an x86_64 host, it returns success instead of failure. + +First, I need to understand what QEMU does. QEMU can run in two main modes: user-mode and system-mode. User-mode emulation allows running executables for different architectures without requiring a full virtual machine setup. It handles the CPU instructions and some system calls, but doesn't provide device emulation or kernel-level functionality. System-mode, on the other hand, emulates an entire computer, including devices, memory management units (MMUs), and other hardware components. + +In this case, the user is using qemu-user to run an aarch64 executable on an x86_64 host. The problem occurs when calling mmap with len == 0. According to the C standard, mmap should return MAP_FAILED (-1) when given a length of zero. However, in this scenario, it's returning NULL (which is 0), indicating success, which is incorrect. + +Looking at the reproduction steps, they're using qemu-user-binfmt and executing a cross-compiled binary. The test shows that when run under QEMU, mmap doesn't fail as expected, causing an assertion failure. In contrast, running the same program on a native ARM host works correctly, returning MAP_FAILED with errno 22 (invalid argument), which is appropriate. + +This issue seems to be within how QEMU's user-mode emulator handles the mmap system call. It should mimic the behavior of a real system where mmap(len=0) returns -1 and sets errno appropriately. If it doesn't do that, it's a bug in the emulation layer meant to handle such system calls correctly. + +Since this problem is specific to how system calls are emulated when running user-mode binaries under QEMU, it falls under user-mode emulation. There's no mention of devices or lower-level hardware issues, which would point towards system-mode problems. The focus here is on the correct handling of a system call within the process being emulated. + +Therefore, this bug report is related to user-mode. +</think> + +user \ No newline at end of file |