adduser: Allow '@', '%', '/' and '\' in username #7
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Allow '@', '%', '/' and '\' in username for adduser command to support usernames in the form of : username@domain username%domain domain/username domain\username Username in those forms may have some limitations in various services like email, ssh, but simply disallowing them prevents more generic use of the username based on email address or name with realm.
okuoku
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Nov 12, 2023
When I planned to print the command in read_line_input, I found that after the system started, the command printed for the first time was always garbled. After analysis, it is found that in the init() function of ash, the variable basepf.buf is not initialized after applying for memory, resulting in garbled initial data. Then assign it to the global variable g_parsefile->buf in ash.c, and then pass g_parsefile->buf to the parameter command of the function read_line_input in the function preadfd(), and finally cause it to be garbled when the command is printed by read_line_input. The call stack is as follows: #0 read_line_input (st=0xb6fff220, prompt=0xb6ffc910 "\\[\\033[32m\\]\\h \\w\\[\\033[m\\] \\$ ", command=command@entry=0xb6ffc230 "P\325\377\266P\325\377\266", maxsize=maxsize@entry=1024) at libbb/lineedit.c:2461 mirror#1 0x0043ef8c in preadfd () at shell/ash.c:10812 mirror#2 preadbuffer () at shell/ash.c:10914 mirror#3 pgetc () at shell/ash.c:10997 mirror#4 0x00440c20 in pgetc_eatbnl () at shell/ash.c:11039 mirror#5 0x00440cbc in xxreadtoken () at shell/ash.c:13157 mirror#6 0x00440f40 in readtoken () at shell/ash.c:13268 mirror#7 0x00441234 in list (nlflag=nlflag@entry=1) at shell/ash.c:11782 mirror#8 0x004420e8 in parsecmd (interact=<optimized out>) at shell/ash.c:13344 mirror#9 0x00442c34 in cmdloop (top=top@entry=1) at shell/ash.c:13549 mirror#10 0x00444e4c in ash_main (argc=<optimized out>, argv=0x444e4c <ash_main+1328>) at shell/ash.c:14747 mirror#11 0x00407954 in run_applet_no_and_exit (applet_no=9, name=<optimized out>, argv=0xbefffd34) at libbb/appletlib.c:1024 mirror#12 0x00407b68 in run_applet_and_exit (name=0xbefffe56 "ash", argv=0x9) at libbb/appletlib.c:1047 mirror#13 0x00407f88 in main (argc=<optimized out>, argv=0xbefffd34) at libbb/appletlib.c:1181 Fixes: 82dd14a ("ash: use CONFIG_FEATURE_EDITING_MAX_LEN") Signed-off-by: zhuyan <zhuyan34@huawei.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Allow '@', '%', '/' and '' in username for adduser command to support
usernames in the form of :
username@domain
username%domain
domain/username
domain\username
Username in those forms may have some limitations in various services
like email, ssh, but simply disallowing them prevents more generic
use of the username based on email address or name with realm.