Messages in this thread | | | From | Casey Schaufler <> | Subject | 4.18-rc1 regression in /proc/self xattr handling | Date | Fri, 22 Jun 2018 07:37:00 -0700 |
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There is a regression in behavior regarding xattrs in /proc after:
commit 1bbc55131e59bd099fdc568d3aa0b42634dbd188 Author: Al Viro <viro@zeniv.linux.org.uk> Date: Wed May 2 21:26:16 2018 -0400
procfs: get rid of ancient BS in pid_revalidate() uses
Prior to this change lgetxattr() would provide the correct attributes for entries in /proc. With this change I see that while the behavior remains correct if the procid is specified, it is not when "self" is used. On a system with Smack enabled, where the shell has the Smack label "Crackle" I see:
[root@localhost linux]# attr -S -g SMACK64 /proc/self/attr/current Attribute "SMACK64" had a 1 byte value for /proc/self/attr/current: _ [root@localhost linux]# attr -S -g SMACK64 /proc/$BASHPID/attr/current Attribute "SMACK64" had a 7 byte value for /proc/1716/attr/current: Crackle
These should be the same, and in the past have been. I don't know what SELinux expects as far as attributes in /proc, so I can't say if the problem is manifest with SELinux.
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