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linux-user: Implement pivot_root

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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>
This commit is contained in:
YAMAMOTO Takashi 2021-05-31 14:50:12 +09:00 committed by Laurent Vivier
parent 0e88769704
commit e10fbe8f34
1 changed files with 21 additions and 0 deletions
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21
linux-user/syscall.c
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@ -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;