Solaris上用MDB修改指定进程的EUID，本文就是解释如何用MDB看一下内核数据结构，具体到这里就是proc_t p_cred->cr_uid。当然，各位内行可以自行发散其意义，开脑洞。
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普通用户scz尝试打开/etc/shadow: $ echo $$ 25182 $ id uid=1000(scz) gid=1(other) $ vi /etc/shadow vi进程启动，但报错: "/etc/shadow" Permission denied 在mdb里修改vi进程的cr_uid(即EUID): > ::pgrep vi S PID PPID PGID SID UID FLAGS ADDR NAME R 19011 25182 19011 25182 1000 0x4a004000 00000300029a5380 vi > 0t25182 ::pid2proc | ::print -at proc_t p_cred 300029a1840 struct cred *p_cred = 0x3000874fd30 > 0t19011 ::pid2proc | ::print -at proc_t p_cred 300029a53a0 struct cred *p_cred = 0x3000874fd30 > 00000300029a5380 ::print -at proc_t p_cred->cr_uid 3000874fd34 uid_t p_cred->cr_uid = 0x3e8 > ::sizeof uid_t sizeof (uid_t) = 4 > 3000874fd34 /X 0x3000874fd34: 3e8 > 3000874fd34 /U 0x3000874fd34: 1000 > ! grep :1000: /etc/passwd scz:x:1000:1:scz:/export/home/scz:/usr/bin/bash > ! getent passwd 1000 scz:x:1000:1:scz:/export/home/scz:/usr/bin/bash > 3000874fd34 /W 0 mdb: failed to write 0 at address 0x3000874fd34: target is not open for writing > $W > 3000874fd34 /W 0 0x3000874fd34: 0x3e8 = 0x0 现在可以在vi里执行: :rew 或 :r /etc/shadow 注意，父子进程共用p_cred，修改vi进程的cr_uid，实际会导致bash的EUID为0: # id uid=1000(scz) gid=1(other) euid=0(root) |