diff options
Diffstat (limited to 'results/classifier/qwen3:32b/reasoning/syscall/1728116')
| -rw-r--r-- | results/classifier/qwen3:32b/reasoning/syscall/1728116 | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/results/classifier/qwen3:32b/reasoning/syscall/1728116 b/results/classifier/qwen3:32b/reasoning/syscall/1728116 new file mode 100644 index 00000000..a8828394 --- /dev/null +++ b/results/classifier/qwen3:32b/reasoning/syscall/1728116 @@ -0,0 +1,15 @@ +<think> +Okay, let's see. The user is talking about an issue with QEMU's linux-user mode where /proc/self/auxv is empty. They mention that in older versions like 2.7.1 it worked, but starting from 2.10.1, it's failing. The problem seems to be related to a commit that introduced a change in syscall.c. + +The key part here is the output from the logging they added. The len variable is showing up as 18446744073709551264 and -352. Those numbers look like they could be related to how the value is being interpreted, possibly a sign or size issue. The correct length should be 352, but it's being read as a very large number (which is 0xfffffffffffffd80 in hex, which is -352 in two's complement for a 64-bit system). + +Looking at the code change in the commit, maybe there's a mistake in how the length is calculated or passed. The auxv_len is probably stored as an unsigned value, but if it's being treated as signed somewhere, that could cause issues. For example, if the length is stored as a negative number (like -352) but interpreted as an unsigned, it becomes this huge positive number. However, in the code, they're logging len as both unsigned and signed. The output shows that when printed as unsigned, it's 18446744073709551264 (which is indeed -352 as a signed 64-bit integer), and as signed, it's -352. + +The problem arises because the code is using an unsigned type (abi_ulong) for len, which is correct, but perhaps the way the value is being set in ts->info->auxv_len is incorrect. For instance, if the calculation for auxv_len is done with a subtraction that results in a negative value (due to incorrect order) when it should be positive. For example, if they did (a - b) when it should be (b - a), leading to a negative number being stored in an unsigned variable, which would wrap around to a very large value. Then, when using that len to read, it would read zero bytes because the length is invalid. + +The commit in question (7c4ee5bcc) probably introduced a logic error where the length is being calculated incorrectly, leading to the auxv_len being set to an incorrect value. This would fall under a syscall category because it's related to how the syscall for opening /proc/self/auxv is handled, specifically the data preparation for that syscall. The error is in the handling of the auxiliary vector data during the open syscall, leading to incorrect data being provided to the guest process. + +So the classification here is about a syscall error because it's related to the system call handling in QEMU's user-mode emulation, specifically the open syscall for /proc/self/auxv. The incorrect length causes the file to be empty when read, which is a syscall handling issue. +</think> + +syscall \ No newline at end of file |