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linux-user: allow null pathname for statx()/fstatat()

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Since Linux 6.11, the path argument may be NULL.

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`.

Cc: qemu-stable@nongnu.org
Signed-off-by: Jean-Christian CÎRSTEA <jean.christian.cirstea@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20251229121416.2209295-1-jean.christian.cirstea@gmail.com>
(cherry picked from commit 82ae60c8b5cb98d610056a1e2d0ba72e9ef7907c)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Jean-Christian CÎRSTEA 2025-12-29 14:14:16 +02:00 • committed by Michael Tokarev
parent f34c0eb054
commit e71e02caa7
1 changed files with 7 additions and 3 deletions
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10
linux-user/syscall.c
View file

@ -12141,9 +12141,13 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
int dirfd = arg1;
int flags = arg3;
p = lock_user_string(arg2);
if (p == NULL) {
return -TARGET_EFAULT;
p = NULL;
/* Since Linux 6.11, the path argument may be NULL */
if (arg2 != 0) {
p = lock_user_string(arg2);
if (p == NULL) {
return -TARGET_EFAULT;
}
}
#if defined(__NR_statx)
{