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-id = 1093
-title = "RISC-V: signal frame is misaligned in signal handlers"
-state = "closed"
-created_at = "2022-06-29T20:45:51.271Z"
-closed_at = "2022-08-02T13:35:56.948Z"
-labels = ["Closed::Fixed", "linux-user", "target: riscv"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/1093"
-host-os = "Linux"
-host-arch = "x86_64"
-qemu-version = "7.0.0"
-guest-os = "n/a"
-guest-arch = "RISC-V 64"
-description = """`qemu-user` misaligns the signal frame (to 4 bytes rather than 16 bytes) on RISC-V 64, e.g causing pointer misalignment diagnostics to be triggered by UBSan."""
-reproduce = """1. Create a C file with the following contents:
-```c
-#include <signal.h>
-#include <stdio.h>
-
-void handler(int sig, siginfo_t *info, void *context) {
-\tprintf("signal occurred, info: %p, context: %p\\n", info, context);
-}
-
-int main() {
-\tstruct sigaction act;
-\tact.sa_flags = SA_SIGINFO;
-\tact.sa_sigaction = handler;
-\tsigaction(SIGINT, &act, NULL);
-
-\t// Deliberately misalign the stack
-\tasm volatile ("addi sp, sp, -4");
-
-\twhile(1);
-\t// Unreachable
-}
-```
-2. Compile with an appropriate RISC-V toolchain and run with `qemu-riscv64 ./a.out`.
-3. Send a `SIGINT` (e.g by hitting Ctrl-C), and observe that the signal frame will be misaligned:
-```
-signal occurred, info: 0x400080025c, context: 0x40008002dc
-```"""
-additional = """This issue is alluded to in the source code, see https://gitlab.com/qemu-project/qemu/-/blob/master/linux-user/riscv/signal.c#L68-69. It should be sufficient to change that constant to 15."""