Enrico,
Am Mittwoch, 14. Februar 2018, 16:02:18 CET schrieb Enrico Weigelt:
> stat64("/etc/busybox.conf", {st_mode=S_IFREG|0644, st_size=198, ...}) = 0
busybox...
> brk(NULL) = 0x58000
> brk(0x79000) = 0x79000
> open("/etc/busybox.conf", O_RDONLY|O_LARGEFILE) = 3
> fstat64(3, {st_mode=S_IFREG|0644, st_size=198, ...}) = 0
> read(3, "[SUID]\n#lines starting with # ar"..., 1024) = 198
> read(3, "", 1024) = 0
> close(3) = 0
> getgid32() = 1
> setgid32(1) = 0
> setuid32(1) = 0
> geteuid32() = 1
> getegid32() = 1
> unshare(CLONE_NEWUTS|CLONE_NEWUSER) = 0
> open("/proc/self/setgroups", O_WRONLY|O_LARGEFILE) = 3
> write(3, "deny", 4) = 4
> close(3) = 0
> open("/proc/self/uid_map", O_WRONLY|O_LARGEFILE) = 3
> write(3, "1 0 1", 5) = -1 EPERM (Operation not permitted)
This mapping looks broken.
Please report to busybox folks.
>From taking a *very* quick look into busybox source, I suspect this should fix
it:
diff --git a/util-linux/unshare.c b/util-linux/unshare.c
index 875e3f86e304..3f59cf4d27c2 100644
--- a/util-linux/unshare.c
+++ b/util-linux/unshare.c
@@ -350,9 +350,9 @@ int unshare_main(int argc UNUSED_PARAM, char **argv)
* in that user namespace.
*/
xopen_xwrite_close(PATH_PROC_SETGROUPS, "deny");
- sprintf(uidmap_buf, "%u 0 1", (unsigned)reuid);
+ sprintf(uidmap_buf, "0 %u 1", (unsigned)reuid);
xopen_xwrite_close(PATH_PROC_UIDMAP, uidmap_buf);
- sprintf(uidmap_buf, "%u 0 1", (unsigned)regid);
+ sprintf(uidmap_buf, "0 %u 1", (unsigned)regid);
xopen_xwrite_close(PATH_PROC_GIDMAP, uidmap_buf);
} else
if (setgrp_str) {
Thanks,
//richard
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