[OpenBMC] [Linux-5.10] useradd: cannot open /etc/passwd

[Lei Yu]

As discussed in [discord][1], a similar issue could be simply reproduced by:
`touch /etc/passwd`, that gives `Invalid argument`.

With strace, the error is from `utimensat_time64()`

    # ./strace touch /etc/passwd
    execve("/bin/touch", ["touch", "/etc/passwd"], 0x7eef7dd4 /* 16 vars */) = 0
    ......
    getuid32()                              = 0
    utimensat_time64(AT_FDCWD, "/etc/passwd", NULL, 0) = -1 EINVAL
(Invalid argument)
    write(2, "touch: /etc/passwd: Invalid argu"..., 37touch:
/etc/passwd: Invalid argument
    ) = 37
    exit_group(1)

[1]: https://discord.com/channels/775381525260664832/775694683589574659/826065967582281768

On Mon, Mar 29, 2021 at 2:18 PM CS20 CHLi30 <CHLI30 at nuvoton.com> wrote:
>
> Hi All,
>
>
>
> We met this issue symptom after upgrading Linux kernel to 5.10.xx.
>
> However, we didn't meet this issue at kernel 5.4 and 5.8.
>
>
>
> And, we had run QEMU with latest palmetto 5.10.23 image, issue symptom also can be repo it.
>
> Is there anyone meet this issue at Linux kernel 5.10.xx? From journal log, we didn’t find any obvious log about this symptom.
>
> This issue is easy to repo and 100%, you can follow below repo step on your OpenBMC project to repo it. Thanks.
>
>
>
> Symptom:
>
> ==============================================================================
>
> Ipmi.Test Ipmi User :: Test suite for OpenBMC IPMI user management.
>
> ==============================================================================
>
> Verify IPMI User Summary :: Verify IPMI maximum supported IPMI use...
>
> | FAIL |
>
> Set User Name command failed (user 9, name HgekZnCI): Unspecified error: 1 != 0
>
>
>
> Journal Log:
>
> olympus-nuvoton kernel: Linux version 5.10.14-711b69d-dirty-08f25ae (oe-user at oe-host)
>
> Mar 18 14:42:26 olympus-nuvoton phosphor-user-manager[1409]: useradd: cannot open /etc/passwd
>
> Mar 18 14:42:26 olympus-nuvoton useradd[1409]: failed adding user 'HgekZnCI', data deleted
>
> Mar 18 14:42:26 olympus-nuvoton phosphor-user-manager[288]: The operation failed internally.
>
> Mar 18 14:42:26 olympus-nuvoton phosphor-user-manager[288]: Unable to create new user
>
> Mar 18 14:42:26 olympus-nuvoton phosphor-user-manager[288]: The operation failed internally.
>
>
>
> How to repo:
>
> 1. Run robot -t Verify_IPMI_User_Summary ipmi/test_ipmi_user.robot or
>
> 2. Execute useradd command to add user in our Olympus-nuvoton runbmc device.
>
>   root at olympus-nuvoton:/# useradd timlee
>
>   useradd: cannot open /etc/passwd
>
>
>
> QEMU for plametto test result:
>
> root at palmetto:~# cat /proc/version
>
> Linux version 5.10.23-6687842 (oe-user at oe-host) (arm-openbmc-linux-gnueabi-gcc (GCC) 10.2.0, GNU ld (GNU Binutils) 2.36.1.20210209) #1 Sun Mar 28 20:54:20 UTC 2021
>
> root at palmetto:~# useradd timlee
>
> useradd: cannot open /etc/passwd
>
>
>
> Debug:
>
> We had added more debug log in overlayfs driver, but seems all overlayfs function call normally without error code return.
>
> Here is the part of log after executing useradd command.
>
>
>
> root at olympus-nuvoton:/# useradd timlee66
>
> Mar 24 05:21:41 olympus-nuvoton kernel: overlayfs: open(a6b0076c[sbin/useradd/l], 0400040) -> (581ac127, 0401400040)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(c2f826cb[etc/nsswitch.conf/l], 00) -> (f971c00e, 0401000000)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(6fc219b2[etc/ld.so.cache/l], 0400000) -> (0d21569c, 0401400000)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(48a47202[lib/libnss_files-2.32.so/l], 0400000) -> (ee6b0bfe, 0401400000)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(3c1f263f[etc/passwd/l], 00) -> (b7939c0b, 0401000000)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(176fd21b[etc/ld.so.cache/l], 0400000) -> (d2e6be78, 0401400000)
>
> Mar 24 05:21:46 olympus-nuvoton kernel: overlayfs: open(607e8d70[lib/libnss_ldap.so.2/l], 0400000) -> (57f4f2f1, 0401400000)
>
> Mar 24 05:21:52 olympus-nuvoton kernel: overlayfs: create(etc/passwd.985, 0100600) = 0
>
> Mar 24 05:21:52 olympus-nuvoton kernel: overlayfs: open(c46e5b8b[etc/passwd.985/u], 0400001) -> (ef6449e9, 0401400001)
>
> Mar 24 05:21:52 olympus-nuvoton kernel: overlayfs: link(etc/passwd.985, etc/passwd.lock) = 0
>
> Mar 24 05:21:52 olympus-nuvoton kernel: overlayfs: create(work/#1b, 0100000) = 0
>
> Mar 24 05:21:52 olympus-nuvoton kernel: overlayfs: unlink(work/#1b) = 0
>
> Mar 24 05:21:52 olympus-nuvoton useradd[985]: failed adding user 'timlee', data deleted
>
> useradd: cannot open /etc/passwd
>
>
>
> Best regards,
>
> Tim
>
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-- 
BRs,
Lei YU