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[PULL 4/9] linux-user: Implement pivot_root
From: |
Laurent Vivier |
Subject: |
[PULL 4/9] linux-user: Implement pivot_root |
Date: |
Mon, 21 Jun 2021 13:04:40 +0200 |
From: YAMAMOTO Takashi <yamamoto@midokura.com>
Used by runc.
Signed-off-by: YAMAMOTO Takashi <yamamoto@midokura.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210531055019.10149-6-yamamoto@midokura.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
linux-user/syscall.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 54037db8d66d..723cb02d2a00 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8257,6 +8257,10 @@ static int host_to_target_cpu_mask(const unsigned long
*host_mask,
return 0;
}
+#if defined(TARGET_NR_pivot_root) && defined(__NR_pivot_root)
+_syscall2(int, pivot_root, const char *, new_root, const char *, put_old)
+#endif
+
/* This is an internal helper for do_syscall so that it is easier
* to have a single return point, so that actions, such as logging
* of syscall results, can be performed.
@@ -13220,6 +13224,23 @@ static abi_long do_syscall1(void *cpu_env, int num,
abi_long arg1,
return ret;
#endif
+#if defined(TARGET_NR_pivot_root)
+ case TARGET_NR_pivot_root:
+ {
+ void *p2;
+ p = lock_user_string(arg1); /* new_root */
+ p2 = lock_user_string(arg2); /* put_old */
+ if (!p || !p2) {
+ ret = -TARGET_EFAULT;
+ } else {
+ ret = get_errno(pivot_root(p, p2));
+ }
+ unlock_user(p2, arg2, 0);
+ unlock_user(p, arg1, 0);
+ }
+ return ret;
+#endif
+
default:
qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num);
return -TARGET_ENOSYS;
--
2.31.1
- [PULL 0/9] Linux user for 6.1 patches, Laurent Vivier, 2021/06/21
- [PULL 2/9] linux-user: Disable static assert involving __SIGRTMAX if it is missing, Laurent Vivier, 2021/06/21
- [PULL 1/9] linux-user: Set CF_PARALLEL when mapping shared memory, Laurent Vivier, 2021/06/21
- [PULL 4/9] linux-user: Implement pivot_root,
Laurent Vivier <=
- [PULL 5/9] linux-user: Let sigaction query SIGKILL/SIGSTOP, Laurent Vivier, 2021/06/21
- [PULL 9/9] linux-user: Use public sigev_notify_thread_id member if available, Laurent Vivier, 2021/06/21
- [PULL 7/9] linux-user: Check for ieee128 fpbits in PPC64 HWCAP2 feature list, Laurent Vivier, 2021/06/21
- [PULL 8/9] linux-user: Fix incorrect use of feature-test-macros, Laurent Vivier, 2021/06/21
- [PULL 3/9] linux-user/trace-events: fix minor typo in format string, Laurent Vivier, 2021/06/21
- [PULL 6/9] tests/tcg/linux-test: Check that sigaction can query SIGKILL/SIGSTOP, Laurent Vivier, 2021/06/21
- Re: [PULL 0/9] Linux user for 6.1 patches, Peter Maydell, 2021/06/22