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Subject2.2.6 - exec.c - CONFIG_BINFMT_MISC inconsistency .
Hi,

This is the final mail on this topici from our side. According to the
response from *Linus* it is a policy to allow root users to override
existing binary formats registered in the kernel via the
CONFIG_BINFMT_MISC interface.

What we are trying to point out is , that this policy is not
consistently followed when the support for CONFIG_BINFMT_MISC is compiled
into the kernel.

When the support is compiled into the kernel , MISC handlers reach the end
of the linked list, hence overriding existing formats is not possible

When the support is compiled as the module , MISC handlers are at the
beginning of the linked list, hence overrides are possible.

To make this consistent we have attached the patch to exec.c , which
now calls init_misc_binfmt() at the end of the initialisation
sequence hence making sure that if the support for CONFIG_BINFMT_MISC
is compiled into the kernel , the handlers are attached at the beginning
of the linked list , making overrides possible.

This according to us is a viable solution.

Comments ??

Regards,
Sharad/Suman
Hughes Software Systems, India
--- exec.c.orig Mon Apr 26 13:24:43 1999
+++ exec.c Mon Apr 26 13:25:03 1999
@@ -53,9 +53,6 @@

void __init binfmt_setup(void)
{
-#ifdef CONFIG_BINFMT_MISC
- init_misc_binfmt();
-#endif

#ifdef CONFIG_BINFMT_ELF
init_elf_binfmt();
@@ -81,6 +78,9 @@
init_em86_binfmt();
#endif

+#ifdef CONFIG_BINFMT_MISC
+ init_misc_binfmt();
+#endif
/* This cannot be configured out of the kernel */
init_script_binfmt();
}
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