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authorYAMAMOTO Takashi <yamamoto@midokura.com>2021-05-31 14:50:12 +0900
committerLaurent Vivier <laurent@vivier.eu>2021-06-20 16:04:01 +0200
commite10fbe8f34843891b18f68f76320b43606f4df69 (patch)
treeef96ff97977b6a49bbe49993d1006a847a0b928d /linux-user
parent0e8876970401dee2055c1eb1c23f92f2e57d73ad (diff)
linux-user: Implement pivot_root
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>
Diffstat (limited to 'linux-user')
-rw-r--r--linux-user/syscall.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 54037db8d6..723cb02d2a 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;