From 4af75df6a410ce76d9f60f27b07e5645ecc2c5ed Mon Sep 17 00:00:00 2001 From: James Bottomley Date: Thu, 25 Feb 2016 08:32:51 -0800 Subject: binfmt_misc: add F option description to documentation Signed-off-by: James Bottomley --- Documentation/binfmt_misc.txt | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'Documentation/binfmt_misc.txt') 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: -- cgit v1.2.3