关于 A 用户设置的符号链接, B 用户无法访问的问题 - V2EX
Distributions
Ubuntu
Fedora
CentOS
中文资源站
网易开源镜像站
vencentge
V2EX    Linux

关于 A 用户设置的符号链接, B 用户无法访问的问题

  •  
  •   vencentge Apr 10, 2020 3022 views
    This topic created in 2247 days ago, the information mentioned may be changed or developed.

    image.png 如上图所示,造成这个原因是什么啊

    8 replies    2020-04-11 15:48:47 +08:00
    liuxu
        1
    liuxu  
       Apr 10, 2020
    google 一下你就知道了。权限在 inode 里,软连接只是指向了文件的 inode,然后读取 passwd 的 inode 里面的权限数据,你这用户的权限没有
    vencentge
        2
    vencentge  
    OP
       Apr 10, 2020
    @liuxu 可是我两个用户,都是能直接读取到 /etc/passwd 这样的文件,具备你说的用户读取权限吧。
    choury
        3
    choury  
       Apr 10, 2020
    strace cat xxx
    看下什么错误不就知道了
    cnt2ex
        4
    cnt2ex  
       Apr 11, 2020
    似乎是和目录的 sticky bits 有关。

    https://lwn.net/Articles/390565/

    The solution is to permit symlinks to only be followed when outside a sticky world-writable directory, or when the uid of the symlink and follower match, or when the directory owner matches the symlink's owner.
    cnt2ex
        5
    cnt2ex  
       Apr 11, 2020   1
    /proc/sys/fs/protected_symlinks
    把值改成 0 就可以了。具体可以看
    https://www.kernel.org/doc/Documentation/sysctl/fs.txt
    liuxu
        6
    liuxu  
       Apr 11, 2020
    你把 passwd 权限贴出来
    vencentge
        7
    vencentge  
    OP
       Apr 11, 2020
    @cnt2ex 正解,非常感谢。
    vencentge
        8
    vencentge  
    OP
       Apr 11, 2020
    这是修改为 1 的演示
    ![image.png]( https://i.loli.net/2020/04/11/RWjnurzai9SwlVE.png)
    这是修改 0 的演示
    ![image.png]( https://i.loli.net/2020/04/11/USvD9FfczAPx1Ya.png)
    About     Help     Advertise     Blog     API     FAQ     Solana     2475 Online   Highest 6679       Select Language
    创意工作者们的社区
    World is powered by solitude
    VERSION: 3.9.8.5 77ms UTC 00:47 PVG 08:47 LAX 17:47 JFK 20:47
    Do have faith in what you're doing.
    ubao msn snddm index pchome yahoo rakuten mypaper meadowduck bidyahoo youbao zxmzxm asda bnvcg cvbfg dfscv mmhjk xxddc yybgb zznbn ccubao uaitu acv GXCV ET GDG YH FG BCVB FJFH CBRE CBC GDG ET54 WRWR RWER WREW WRWER RWER SDG EW SF DSFSF fbbs ubao fhd dfg ewr dg df ewwr ewwr et ruyut utut dfg fgd gdfgt etg dfgt dfgd ert4 gd fgg wr 235 wer3 we vsdf sdf gdf ert xcv sdf rwer hfd dfg cvb rwf afb dfh jgh bmn lgh rty gfds cxv xcv xcs vdas fdf fgd cv sdf tert sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf shasha9178 shasha9178 shasha9178 shasha9178 shasha9178 liflif2 liflif2 liflif2 liflif2 liflif2 liblib3 liblib3 liblib3 liblib3 liblib3 zhazha444 zhazha444 zhazha444 zhazha444 zhazha444 dende5 dende denden denden2 denden21 fenfen9 fenf619 fen619 fenfe9 fe619 sdf sdf sdf sdf sdf zhazh90 zhazh0 zhaa50 zha90 zh590 zho zhoz zhozh zhozho zhozho2 lislis lls95 lili95 lils5 liss9 sdf0ty987 sdft876 sdft9876 sdf09876 sd0t9876 sdf0ty98 sdf0976 sdf0ty986 sdf0ty96 sdf0t76 sdf0876 df0ty98 sf0t876 sd0ty76 sdy76 sdf76 sdf0t76 sdf0ty9 sdf0ty98 sdf0ty987 sdf0ty98 sdf6676 sdf876 sd876 sd876 sdf6 sdf6 sdf9876 sdf0t sdf06 sdf0ty9776 sdf0ty9776 sdf0ty76 sdf8876 sdf0t sd6 sdf06 s688876 sd688 sdf86