Eu tenho um PC com o Ubuntu 16.04 instalado. Recentemente, quero instalar alguns pacotes, mas tenho problemas para instalá-los. Após algumas pesquisas, descobri que a falha parece estar relacionada ao sistema de contas de usuário linux. O problema é que qualquer arquivo com um nome prefixado por passwd.não pode ser criado no /etccaminho.
# ls /etc/passwd.*
ls: cannot access '/etc/passwd.*': No such file or directory
# touch /etc/passwd.test-test-test
touch: cannot touch '/etc/passwd.test-test-test': Permission denied
# ls /etc/passwe.*
ls: cannot access '/etc/passwe.*': No such file or directory
# touch /etc/passwe.test-test-test
#
Posso criar esse arquivo em outros caminhos, como /ou /usr, mas não em /etc, e posso criar arquivos com outros nomes de arquivos em /etc, mas não com nomes de arquivos prefixados por passwd.. Não consigo reproduzir esse problema com outros PCs.
Eu tentei outros comandos:
nano /etc/shadow.xxxecho xxx > /etc/shadow.xxxtouch /etc/test-temp-file && mv /etc/test-temp-file /etc/shadow.xxxsystemctl stop apparmor- Reinicie o sistema
Nada funciona.
O que poderia causar este problema?
Aqui estão algumas saídas do comando debug:
# ls -ld /etc
drwxr-xr-x 136 root root 12288 Aug 12 10:07 /etc
# lsattr -d /etc
----------I--e-- /etc
# ls -dZ /etc
? /etc
# type -a touch
touch is /usr/bin/touch
touch is /bin/touch
# file "$(command -v touch)"
/usr/bin/touch: symbolic link to /bin/touch
Aqui está a stracesaída:
# strace touch /etc/passwd.test-test-test
execve("/usr/bin/touch", ["touch", "/etc/passwd.test-test-test"], [/* 22 vars */]) = 0
brk(NULL) = 0x8da000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=80559, ...}) = 0
mmap(NULL, 80559, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f9bc360e000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\t\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1868984, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9bc360d000
mmap(NULL, 3971488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f9bc3033000
mprotect(0x7f9bc31f3000, 2097152, PROT_NONE) = 0
mmap(0x7f9bc33f3000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c0000) = 0x7f9bc33f3000
mmap(0x7f9bc33f9000, 14752, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f9bc33f9000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9bc360c000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f9bc360b000
arch_prctl(ARCH_SET_FS, 0x7f9bc360c700) = 0
mprotect(0x7f9bc33f3000, 16384, PROT_READ) = 0
mprotect(0x60e000, 4096, PROT_READ) = 0
mprotect(0x7f9bc3622000, 4096, PROT_READ) = 0
munmap(0x7f9bc360e000, 80559) = 0
brk(NULL) = 0x8da000
brk(0x8fb000) = 0x8fb000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=1668976, ...}) = 0
mmap(NULL, 1668976, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f9bc3473000
close(3) = 0
open("/etc/passwd.test-test-test", O_WRONLY|O_CREAT|O_NOCTTY|O_NONBLOCK, 0666) = -1 EACCES (Permission denied)
utimensat(AT_FDCWD, "/etc/passwd.test-test-test", NULL, 0) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2995, ...}) = 0
read(3, "# Locale name alias data base.\n#"..., 4096) = 2995
read(3, "", 4096) = 0
close(3) = 0
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, "touch: ", 7touch: ) = 7
write(2, "cannot touch '/etc/passwd.test-t"..., 41cannot touch '/etc/passwd.test-test-test') = 41
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
write(2, ": Permission denied", 19: Permission denied) = 19
write(2, "\n", 1
) = 1
close(1) = 0
close(2) = 0
exit_group(1) = ?
+++ exited with 1 +++
ubuntu
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EFanZh
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ls -ld /etcdiz? Que tallsattr -d /etc? Se você está usando o SELinux, o quels -dZ /etcdiz? Se você estiver usando o AppArmor, o que o comando equivalente (não sei o que é) diz? Como isso é/etc/diferente dos/etcoutros PCs? Execute os mesmos comandos lá e procure diferenças.touchuma função ou um script ou algo assim? O que fazertype -a touchefile "$(command -v touch)"relatar? Não consigo reproduzir na minha caixa 16.04.root, certo?Respostas:
Eu descobri o porquê. É porque o ISecTP (Endpoint Security para Linux Threat Prevention) foi instalado no meu PC. Inclui a " Proteção de Acesso ", que usa a interface do kernel fanotify ou a injeção de um módulo personalizado no kernel ( configurável qual deles ele faz ), para fazer com que os acessos a caminhos arbitrários sejam negados. Eu não estava ciente disso, porque não sou o único que usa o PC. Depois de desinstalá-lo, está tudo bem agora.
Obrigado a todos por sua ajuda!
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