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Diffstat (limited to 'results/classifier/deepseek-r1:32b/reasoning/runtime/2448')
| -rw-r--r-- | results/classifier/deepseek-r1:32b/reasoning/runtime/2448 | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/results/classifier/deepseek-r1:32b/reasoning/runtime/2448 b/results/classifier/deepseek-r1:32b/reasoning/runtime/2448 new file mode 100644 index 00000000..110ee3bd --- /dev/null +++ b/results/classifier/deepseek-r1:32b/reasoning/runtime/2448 @@ -0,0 +1,21 @@ +<think> +Okay, so I'm trying to figure out how to classify this bug report for QEMU. The problem seems to be related to how the AT_EXECFD auxiliary value is handled when using binfmt_misc with QEMU as an interpreter for non-native binaries. Let me break it down step by step. + +First, from the description, when a binary is executed via QEMU's binfmt support and the 'O' flag is set (which I think enables opening the binary), if file descriptor 0 is closed, QEMU doesn't handle this correctly. Instead of leaving stdin closed, it opens FD 0 to point to the executable and passes it as AT_EXECFD. This causes the program to read from its own executable instead of having stdin closed. + +The user provided some code snippets showing how QEMU's main.c handles execfd. It checks if execfd is zero and then tries to open the exec_path, which might be problematic because a valid AT_EXECFD could be zero but intended to indicate that FD 0 is not used for the executable. + +Looking at the steps to reproduce, running commands like `cat <&-` should result in an error about the bad file descriptor. However, with QEMU's current behavior, it instead dumps the executable as if stdin was open and pointing to itself. This leads to incorrect program behavior, especially for tests that expect stdin to be closed. + +The user also mentioned that they looked into how `qemu_getauxval` works in `util/getauxval.c`. They noted that this function doesn't currently distinguish between AT_EXECFD being zero (a valid case) and not found. On Linux, glibc sets errno to ENOENT if the auxiliary value isn't present, which could be used to detect whether AT_EXECFD was actually set or not. + +So, the problem arises because QEMU incorrectly treats a zero execfd as meaning it needs to open the executable again, leading to FD 0 being left pointing to the binary. This should instead only happen if AT_EXECFD is not present (i.e., it's not found), allowing the program to have stdin closed. + +The user suggests that fixing this requires modifying `qemu_getauxval` to properly detect whether AT_EXECFD was set or not, perhaps by checking errno after a failed getauxval call. They're asking how to implement this correctly across different libc versions (like musl and glibc). + +Now, classifying the bug: The issue is about handling an auxiliary value incorrectly during execution setup. It's not directly related to an instruction being faulty or a syscall error per se. Instead, it's more about runtime behavior—how QEMU initializes file descriptors before executing the target binary. + +So, I think this falls under the "runtime" category because it's about how the program behaves when running and handling resources (file descriptors) incorrectly. +</think> + +runtime \ No newline at end of file |