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authorEric W. Biederman <ebiederm@xmission.com>2016-11-17 07:06:51 +0300
committerEric W. Biederman <ebiederm@xmission.com>2016-11-22 22:21:00 +0300
commitf84df2a6f268de584a201e8911384a2d244876e3 (patch)
tree09976911531fe57cff9299cd8687ae6d1c9b14ed /.get_maintainer.ignore
parent84d77d3f06e7e8dea057d10e8ec77ad71f721be3 (diff)
downloadlinux-f84df2a6f268de584a201e8911384a2d244876e3.tar.xz
exec: Ensure mm->user_ns contains the execed files
When the user namespace support was merged the need to prevent ptrace from revealing the contents of an unreadable executable was overlooked. Correct this oversight by ensuring that the executed file or files are in mm->user_ns, by adjusting mm->user_ns. Use the new function privileged_wrt_inode_uidgid to see if the executable is a member of the user namespace, and as such if having CAP_SYS_PTRACE in the user namespace should allow tracing the executable. If not update mm->user_ns to the parent user namespace until an appropriate parent is found. Cc: stable@vger.kernel.org Reported-by: Jann Horn <jann@thejh.net> Fixes: 9e4a36ece652 ("userns: Fail exec for suid and sgid binaries with ids outside our user namespace.") Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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