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authorEric W. Biederman <ebiederm@xmission.com>2016-07-23 11:20:44 -0500
committerEric W. Biederman <ebiederm@xmission.com>2016-07-23 14:51:26 -0500
commitaeaa4a79ff6a5ed912b7362f206cf8576fca538b (patch)
treecfdd5207fef5e23cf7dc84691cd3301faa9688ec /MAINTAINERS
parent81754357770ebd900801231e7bc8d151ddc00498 (diff)
downloadlinux-sh-aeaa4a79ff6a5ed912b7362f206cf8576fca538b.tar.gz
fs: Call d_automount with the filesystems creds
Seth Forshee reported a mount regression in nfs autmounts with "fs: Add user namespace member to struct super_block". It turns out that the assumption that current->cred is something reasonable during mount while necessary to improve support of unprivileged mounts is wrong in the automount path. To fix the existing filesystems override current->cred with the init_cred before calling d_automount and restore current->cred after d_automount completes. To support unprivileged mounts would require a more nuanced cred selection, so fail on unprivileged mounts for the time being. As none of the filesystems that currently set FS_USERNS_MOUNT implement d_automount this check is only good for preventing future problems. Fixes: 6e4eab577a0c ("fs: Add user namespace member to struct super_block") Tested-by: Seth Forshee <seth.forshee@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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