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binfmt_misc: add F option description to documentation 

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
James Bottomley 2016-02-25 08:32:51 -08:00
parent 948b701a60
commit 4af75df6a4
1 changed files with 7 additions and 0 deletions
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7
Documentation/binfmt_misc.txt
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@ -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: