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[PATCH] linux-user: Add support for pivot_root syscall
From: |
David Leonard |
Subject: |
[PATCH] linux-user: Add support for pivot_root syscall |
Date: |
Mon, 12 Oct 2020 17:14:16 +1000 (AEST) |
User-agent: |
Alpine 2.22 (DEB 394 2020-01-19) |
Tested on Ubuntu 20.04 x86_64 against arm-linux-gnueabi toolchain.
Signed-off-by: David Leonard <David.Leonard@digi.com>
---
linux-user/syscall.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 897d20c076..8143c8c280 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -345,6 +345,10 @@ _syscall5(int, kcmp, pid_t, pid1, pid_t, pid2, int, type,
unsigned long, idx1, unsigned long, idx2)
#endif
+#if defined(TARGET_NR_pivot_root) && defined(__NR_pivot_root)
+_syscall2(int, pivot_root, const char *, new_root, const char *, put_old)
+#endif
+
/*
* It is assumed that struct statx is architecture independent.
*/
@@ -8834,6 +8838,22 @@ static abi_long do_syscall1(void *cpu_env, int num,
abi_long arg1,
ret = get_errno(umount2(p, arg2));
unlock_user(p, arg1, 0);
return ret;
+#endif
+#if defined(TARGET_NR_pivot_root) && defined(__NR_pivot_root)
+ case TARGET_NR_pivot_root:
+ {
+ void *p2;
+ p = lock_user_string(arg1);
+ p2 = lock_user_string(arg2);
+ 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
case TARGET_NR_ioctl:
return do_ioctl(arg1, arg2, arg3);
--
2.25.1
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