Le 25/12/2025 à 16:39, Jean-Christian CÎRSTEA a écrit :
Since Linux 6.11, statx() and fstatat() syscalls accept a null `pathname`.
Before this patch, qemu-*-linux-user failed with EFAULT when `pathname` was
specified as NULL, even for Linux kernel hosts > 6.10. This patch fixes this
issue by checking whether `arg2` is 0. If so, don't return EFAULT, but instead
perform the appropiate syscall and let the host's kernel handle null `pathname`.
Signed-off-by: Jean-Christian CÎRSTEA <[email protected]>
---
linux-user/syscall.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 2060e561a2..e1b61f6dc5 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -12142,7 +12142,8 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int
num, abi_long arg1,
int flags = arg3;
p = lock_user_string(arg2);
- if (p == NULL) {
+ /* Since Linux 6.11, the path argument may be NULL */
+ if (arg2 != 0 && p == NULL) {
return -TARGET_EFAULT;
}
#if defined(__NR_statx)
Reviewed-by: Laurent Vivier <[email protected]>
