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addeej
n00b
n00b


Joined: 06 Jul 2014
Posts: 2

PostPosted: Sun Jul 06, 2014 2:51 am    Post subject: root unable to write/delete resolv.conf Reply with quote

I'm completely stumped - for some reason I'm not able to write or delete /etc/resolv.conf:

Code:

# id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),11(floppy),26(tape),27(video)

# rm /etc/resolv.conf
rm: cannot remove ‘/etc/resolv.conf’: Operation not permitted


The file is owned by root, is writeable according to it's file permissions and is on a writeable filesystem:
Code:

# stat /etc/resolv.conf
  File: ‘/etc/resolv.conf’
  Size: 136             Blocks: 8          IO Block: 4096   regular file
Device: 801h/2049d      Inode: 5511820     Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2014-07-05 22:35:18.995895494 -0400
Modify: 2014-07-05 22:36:59.402891018 -0400
Change: 2014-07-05 22:36:59.402891018 -0400
 Birth: -

# lsattr /etc/resolv.conf
-----a-------e-- /etc/resolv.conf

# df -P /etc/resolv.conf
Filesystem     1024-blocks     Used Available Capacity Mounted on
/dev/sda1        106989608 93695940   7835800      93% /

# mount | grep sda1
/dev/sda1 on / type ext4 (rw,noatime,discard,data=ordered)


...I can even copy the file to another name in the same directory and delete it's copy without any problems:

Code:

# cp -a /etc/resolv.conf /etc/resolv.conf.test
# rm /etc/resolv.conf.test


strace'ing the rm command shows this output:

Code:

# strace -f rm /etc/resolv.conf
execve("/bin/rm", ["rm", "/etc/resolv.conf"], [/* 71 vars */]) = 0
brk(0)                                  = 0x123a000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1abbf09000
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=219797, ...}) = 0
mmap(NULL, 219797, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f1abbed3000
close(3)                                = 0
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\33\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1705128, ...}) = 0
mmap(NULL, 3811800, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f1abb947000
mprotect(0x7f1abbae0000, 2097152, PROT_NONE) = 0
mmap(0x7f1abbce0000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x199000) = 0x7f1abbce0000
mmap(0x7f1abbce6000, 14808, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f1abbce6000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1abbed2000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1abbed1000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1abbed0000
arch_prctl(ARCH_SET_FS, 0x7f1abbed1700) = 0
mprotect(0x7f1abbce0000, 16384, PROT_READ) = 0
mprotect(0x611000, 4096, PROT_READ)     = 0
mprotect(0x7f1abbf0a000, 4096, PROT_READ) = 0
munmap(0x7f1abbed3000, 219797)          = 0
brk(0)                                  = 0x123a000
brk(0x125b000)                          = 0x125b000
open("/usr/lib64/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=106082112, ...}) = 0
mmap(NULL, 106082112, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f1ab541c000
close(3)                                = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B38400 opost isig icanon echo ...}) = 0
newfstatat(AT_FDCWD, "/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=136, ...}, AT_SYMLINK_NOFOLLOW) = 0
geteuid()                               = 0
unlinkat(AT_FDCWD, "/etc/resolv.conf", 0) = -1 EPERM (Operation not permitted)
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fcntl(3, F_GETFD)                       = 0x1 (flags FD_CLOEXEC)
fstat(3, {st_mode=S_IFREG|0644, st_size=2492, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1abbf08000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2492
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x7f1abbf08000, 4096)            = 0
open("/usr/share/locale/en_GB.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_GB/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/lib64/charset.alias", O_RDONLY|O_NOFOLLOW) = -1 ENOENT (No such file or directory)
write(2, "rm: ", 4rm: )                     = 4
write(2, "cannot remove \342\200\230/etc/resolv.con"..., 36cannot remove ‘/etc/resolv.conf’) = 36
open("/usr/share/locale/en_GB.utf8/LC_MESSAGES/libc.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_GB/LC_MESSAGES/libc.mo", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=1474, ...}) = 0
mmap(NULL, 1474, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f1abbf08000
close(3)                                = 0
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)
write(2, ": Operation not permitted", 25: Operation not permitted) = 25
write(2, "\n", 1
)                       = 1
lseek(0, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
close(0)                                = 0
close(1)                                = 0
close(2)                                = 0
exit_group(1)                           = ?
+++ exited with 1 +++


What gives? Am I being stupid and missing something really obvious?! :x
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turtles
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Joined: 31 Dec 2004
Posts: 1254

PostPosted: Sun Jul 06, 2014 3:08 am    Post subject: Reply with quote

Code:
chattr -a /etc/resolv.conf

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addeej
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Joined: 06 Jul 2014
Posts: 2

PostPosted: Sun Jul 06, 2014 3:14 am    Post subject: Reply with quote

Stupid indeed, I should have realised the "a" in the lsattr output. Thanks! :oops:
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