diff --git a/Documentation/admin-guide/binfmt-misc.rst b/Documentation/admin-guide/binfmt-misc.rst index 557c8eadb9df..9f0d9132723f 100644 --- a/Documentation/admin-guide/binfmt-misc.rst +++ b/Documentation/admin-guide/binfmt-misc.rst @@ -104,6 +104,46 @@ There are some restrictions: the binary +To use binfmt_misc you have to mount it first. You can mount it with +``mount -t binfmt_misc none /proc/sys/fs/binfmt_misc`` command, or you can add +a line ``none /proc/sys/fs/binfmt_misc binfmt_misc defaults 0 0`` to your +``/etc/fstab`` so it auto mounts on boot. + +You may want to add the binary formats in one of your ``/etc/rc`` scripts during +boot-up. Read the manual of your init program to figure out how to do this +right. + +Think about the order of adding entries! Later added entries are matched first! + + +A few examples (assumed you are in ``/proc/sys/fs/binfmt_misc``): + +- enable support for em86 (like binfmt_em86, for Alpha AXP only):: + + echo ':i386:M::\x7fELF\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfb\xff\xff:/bin/em86:' > register + echo ':i486:M::\x7fELF\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfb\xff\xff:/bin/em86:' > register + +- enable support for packed DOS applications (pre-configured dosemu hdimages):: + + echo ':DEXE:M::\x0eDEX::/usr/bin/dosexec:' > register + +- enable support for Windows executables using wine:: + + echo ':DOSWin:M::MZ::/usr/local/bin/wine:' > register + +For java support see Documentation/admin-guide/java.rst + + +You can enable/disable binfmt_misc or one binary type by echoing 0 (to disable) +or 1 (to enable) to ``/proc/sys/fs/binfmt_misc/status`` or +``/proc/.../the_name``. +Catting the file tells you the current status of ``binfmt_misc/the_entry``. + +You can remove one entry or all entries by echoing -1 to ``/proc/.../the_name`` +or ``/proc/sys/fs/binfmt_misc/status``. A single entry can also be removed +by simply unlinking (``rm``) ``/proc/.../the_name``. + + bpf-backed handlers ------------------- @@ -162,45 +202,6 @@ handler registered in the same user namespace as its binfmt_misc instance. The entry keeps the handler alive; deleting the struct_ops map only prevents new activations. -To use binfmt_misc you have to mount it first. You can mount it with -``mount -t binfmt_misc none /proc/sys/fs/binfmt_misc`` command, or you can add -a line ``none /proc/sys/fs/binfmt_misc binfmt_misc defaults 0 0`` to your -``/etc/fstab`` so it auto mounts on boot. - -You may want to add the binary formats in one of your ``/etc/rc`` scripts during -boot-up. Read the manual of your init program to figure out how to do this -right. - -Think about the order of adding entries! Later added entries are matched first! - - -A few examples (assumed you are in ``/proc/sys/fs/binfmt_misc``): - -- enable support for em86 (like binfmt_em86, for Alpha AXP only):: - - echo ':i386:M::\x7fELF\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfb\xff\xff:/bin/em86:' > register - echo ':i486:M::\x7fELF\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfb\xff\xff:/bin/em86:' > register - -- enable support for packed DOS applications (pre-configured dosemu hdimages):: - - echo ':DEXE:M::\x0eDEX::/usr/bin/dosexec:' > register - -- enable support for Windows executables using wine:: - - echo ':DOSWin:M::MZ::/usr/local/bin/wine:' > register - -For java support see Documentation/admin-guide/java.rst - - -You can enable/disable binfmt_misc or one binary type by echoing 0 (to disable) -or 1 (to enable) to ``/proc/sys/fs/binfmt_misc/status`` or -``/proc/.../the_name``. -Catting the file tells you the current status of ``binfmt_misc/the_entry``. - -You can remove one entry or all entries by echoing -1 to ``/proc/.../the_name`` -or ``/proc/sys/fs/binfmt_misc/status``. A single entry can also be removed -by simply unlinking (``rm``) ``/proc/.../the_name``. - Hints -----