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Diffstat (limited to 'results/classifier/deepseek-r1:32b/reasoning/syscall/1760')
| -rw-r--r-- | results/classifier/deepseek-r1:32b/reasoning/syscall/1760 | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/results/classifier/deepseek-r1:32b/reasoning/syscall/1760 b/results/classifier/deepseek-r1:32b/reasoning/syscall/1760 new file mode 100644 index 000000000..8be0f305c --- /dev/null +++ b/results/classifier/deepseek-r1:32b/reasoning/syscall/1760 @@ -0,0 +1,22 @@ +<think> +Okay, I'm trying to classify this bug report about qemu8-i386 not handling the mmap syscall correctly for 32-bit applications. Let me go through the details step by step. + +First, the problem occurs when running an oldmmap program under QEMU. The strace output shows that the correct arguments are being passed to the mmap system call, but QEMU's -strace is showing different and incorrect arguments. For example, in the user's example, strace reports mmap with NULL as the address, 8192 bytes, etc., while QEMU reports something like 0x40800058 as the first argument. + +Looking at the code provided, the oldmmap.S file uses inline assembly to push the arguments onto the stack for the syscall. The order of pushing is important because syscalls in Linux traditionally use this method. So, the user's program pushes the offset (0), fd (-1), flags (MAP_PRIVATE|MAP_ANONYMOUS), protection (PROT_READ|PROT_WRITE), length (8192, which is 2<<12), and address (0) onto the stack, then sets ebx to esp pointing to this array of arguments. Eax is set to _NR_mmap (90). + +Now, in QEMU's output, it's interpreting the mmap syscall with different arguments: (0x40800058, 0, PROT_NONE, ...). This suggests that either the order of the arguments is incorrect or they're being read from the wrong place. + +The key point here is how syscalls are handled in QEMU. For i386, the old syscall convention uses eax for the number and then pushes the arguments onto the stack. However, newer methods might use different registers. But since _NR_mmap is 90, which was an older syscall number (in some contexts, it's now higher on x86_64), this implies that the code is using the i386 syscall convention. + +QEMU should correctly interpret the stack arguments when emulating the old syscalls. If QEMU isn't decoding them properly, it might be because of a bug in how it reads the stack for these specific syscalls or perhaps an issue with register handling. + +The user mentioned that this is happening on 32-bit mode, so it's not a problem related to instruction encoding but more about how system calls are parsed. Since the issue is specifically about the arguments passed to mmap (a system call), and not about executing instructions incorrectly or runtime errors elsewhere, this falls under a syscall category. + +Therefore, I classify this bug as 'syscall' because it involves incorrect handling of the system call arguments by QEMU's emulator. +</think> + +The issue arises from QEMU improperly decoding the stack-based arguments for the mmap syscall, leading to incorrect strace output. This is related to how syscalls are handled in the emulator. + +**Answer:** +sys \ No newline at end of file |