| Message ID | 1456429136.2377.7.camel@HansenPartnership.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 02/25/16 11:38, James Bottomley wrote: > Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> > --- > Documentation/binfmt_misc.txt | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/Documentation/binfmt_misc.txt b/Documentation/binfmt_misc.txt > index 6b1de70..a22eb69 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 > + emultation is installed and uses the opened image to spawn the emulation > + emulator, meaning it is always available once installed, > + regardless of how the environment changes. > > > There are some restrictions: >
diff --git a/Documentation/binfmt_misc.txt b/Documentation/binfmt_misc.txt index 6b1de70..a22eb69 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 + emultation 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:
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> --- Documentation/binfmt_misc.txt | 7 +++++++ 1 file changed, 7 insertions(+)