path: root/Documentation/binfmt_misc.txt
diff options
authorJames Bottomley <James.Bottomley@HansenPartnership.com>2016-02-25 08:32:51 -0800
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2016-03-30 14:12:22 -0700
commit4af75df6a410ce76d9f60f27b07e5645ecc2c5ed (patch)
treed6d9b91265b5ded69629015c5ca1013ef91642cf /Documentation/binfmt_misc.txt
parent948b701a607f123df92ed29084413e5dd8cda2ed (diff)
binfmt_misc: add F option description to documentation
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'Documentation/binfmt_misc.txt')
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/binfmt_misc.txt b/Documentation/binfmt_misc.txt
index 6b1de7058371..ec83bbce547a 100644
--- a/Documentation/binfmt_misc.txt
+++ b/Documentation/binfmt_misc.txt
@@ -66,6 +66,13 @@ Here is what the fields mean:
This feature should be used with care as the interpreter
will run with root permissions when a setuid binary owned by root
is run with binfmt_misc.
+ 'F' - fix binary. The usual behaviour of binfmt_misc is to spawn the
+ binary lazily when the misc format file is invoked. However,
+ this doesn't work very well in the face of mount namespaces and
+ changeroots, so the F mode opens the binary as soon as the
+ emulation is installed and uses the opened image to spawn the
+ emulator, meaning it is always available once installed,
+ regardless of how the environment changes.
There are some restrictions: