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bug#29475: filesystem does not allow ln to create bad symbolic link
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From: |
bug-coreutils |
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Subject: |
bug#29475: filesystem does not allow ln to create bad symbolic link |
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Date: |
Mon, 27 Nov 2017 18:11:38 -0600 |
Hi Paul:
On Mon 11/27/17 14:37 -0800 Paul Eggert wrote:
> On 11/27/2017 10:17 AM, address@hidden wrote:
> > $ ln -s not-there badlink
> > ln: failed to create symbolic link ‘badlink’: No such file or directory
>
> What happens if you do the following shell command instead?
>
> strace ln -s not-there badlink
>
> On my platform (Fedora 27) the strace output ends this way:
>
> stat("badlink", 0x7ffebc9ddbe0) = -1 ENOENT (No such file or
> directory)
> symlinkat("not-there", AT_FDCWD, "badlink") = 0
> lseek(0, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek)
> close(0) = 0
> close(1) = 0
> close(2) = 0
> exit_group(0) = ?
>
> which is expected. What happens on your platform?
Thanks for your help!
--
Tom
--
$ ls not*
ls: cannot access not*: No such file or directory
$ ln -s not-there badlink
ln: failed to create symbolic link ‘badlink’: No such file or directory
$ strace ln -s not-there badlink
execve("/usr/bin/ln", ["ln", "-s", "not-there", "badlink"], [/* 25 vars */]) = 0
brk(NULL) = 0x147d000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f4387544000
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=54550, ...}) = 0
mmap(NULL, 54550, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f4387536000
close(3) = 0
open("/lib64/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\0\20\35\2\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=2127336, ...}) = 0
mmap(NULL, 3940800, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0x7f4386f61000
mprotect(0x7f4387119000, 2097152, PROT_NONE) = 0
mmap(0x7f4387319000, 24576, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1b8000) = 0x7f4387319000
mmap(0x7f438731f000, 16832, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f438731f000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f4387535000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f4387533000
arch_prctl(ARCH_SET_FS, 0x7f4387533740) = 0
mprotect(0x7f4387319000, 16384, PROT_READ) = 0
mprotect(0x60c000, 4096, PROT_READ) = 0
mprotect(0x7f4387545000, 4096, PROT_READ) = 0
munmap(0x7f4387536000, 54550) = 0
brk(NULL) = 0x147d000
brk(0x149e000) = 0x149e000
brk(NULL) = 0x149e000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=106070960, ...}) = 0
mmap(NULL, 106070960, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f4380a38000
close(3) = 0
stat("badlink", 0x7ffc0eb805a0) = -1 ENOENT (No such file or directory)
symlink("not-there", "badlink") = -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=2502, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f4387543000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2502
read(3, "", 4096) = 0
close(3) = 0
munmap(0x7f4387543000, 4096) = 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/lib64/charset.alias", O_RDONLY|O_NOFOLLOW) = -1 ENOENT (No such file
or directory)
write(2, "ln: ", 4ln: ) = 4
write(2, "failed to create symbolic link \342"..., 44failed to create symbolic
link ‘badlink’) = 44
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)
write(2, ": No such file or directory", 27: No such file or directory) = 27
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 +++
$ doing? / interleave basement-attic-kitchen cleanup/declutter
$ strace ln -s not-there badlink
execve("/usr/bin/ln", ["ln", "-s", "not-there", "badlink"], [/* 25 vars */]) = 0
brk(NULL) = 0x1c8a000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f2e8cc1d000
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=54550, ...}) = 0
mmap(NULL, 54550, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f2e8cc0f000
close(3) = 0
open("/lib64/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\0\20\35\2\0\0\0\0\0"...,
832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=2127336, ...}) = 0
mmap(NULL, 3940800, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0x7f2e8c63a000
mprotect(0x7f2e8c7f2000, 2097152, PROT_NONE) = 0
mmap(0x7f2e8c9f2000, 24576, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1b8000) = 0x7f2e8c9f2000
mmap(0x7f2e8c9f8000, 16832, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f2e8c9f8000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f2e8cc0e000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f2e8cc0c000
arch_prctl(ARCH_SET_FS, 0x7f2e8cc0c740) = 0
mprotect(0x7f2e8c9f2000, 16384, PROT_READ) = 0
mprotect(0x60c000, 4096, PROT_READ) = 0
mprotect(0x7f2e8cc1e000, 4096, PROT_READ) = 0
munmap(0x7f2e8cc0f000, 54550) = 0
brk(NULL) = 0x1c8a000
brk(0x1cab000) = 0x1cab000
brk(NULL) = 0x1cab000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=106070960, ...}) = 0
mmap(NULL, 106070960, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f2e86111000
close(3) = 0
stat("badlink", 0x7ffd46bc8b60) = -1 ENOENT (No such file or directory)
symlink("not-there", "badlink") = -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=2502, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7f2e8cc1c000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2502
read(3, "", 4096) = 0
close(3) = 0
munmap(0x7f2e8cc1c000, 4096) = 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/lib64/charset.alias", O_RDONLY|O_NOFOLLOW) = -1 ENOENT (No such file
or directory)
write(2, "ln: ", 4ln: ) = 4
write(2, "failed to create symbolic link \342"..., 44failed to create symbolic
link ‘badlink’) = 44
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)
write(2, ": No such file or directory", 27: No such file or directory) = 27
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 +++
$