Christian Hesse <[email protected]> on Tue, 2014/12/30 13:42: > Mohammad_AlSaleh <[email protected]> on Tue, 2014/12/30 14:36: > > Hello. > > > > I just came across some weird behavior. > > > > A small testcase: > > > > cd /tmp # should be tmpfs > > touch tfile > > ln -s tfile tlink > > cat tlink > > > > When cat executes, it returns with success(0). But, if cat is executed > > as root, it fails with a permission denied error. > > > > What's really happening is, the open() syscall fails with EACCESS when > > the file is a symlink in a tmpfs-mounted dir. But only fails when run > > as root! > > > > I'm assuming this is a bug. Can anyone confirm it? > > This is expected as /tmp has the sticky bit set. > > https://wiki.ubuntu.com/Security/Features#Symlink_restrictions
As this was related to Ubuntu and pathes do not match... You can control the
behavior via proc filesystem:
/proc/sys/fs/protected_symlinks
Or simply use sysctl:
sysctl -w fs.protected_symlinks=0
If you want to make this permanent add the entry to configuration file
in /etc/sysctl.d/.
--
main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH"
"CX:;",b;for(a/* Chris get my mail address: */=0;b=c[a++];)
putchar(b-1/(/* gcc -o sig sig.c && ./sig */b/42*2-3)*42);}
pgpGPw7AAJgn9.pgp
Description: OpenPGP digital signature
