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module: don't ignore vermagic string if module doesn't have modversions

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Linus found a logic bug: we ignore the version number in a module's
vermagic string if we have CONFIG_MODVERSIONS set, but modversions
also lets through a module with no __versions section for modprobe
--force (with tainting, but still).

We should only ignore the start of the vermagic string if the module
actually *has* crcs to check.  Rather than (say) having an
entertaining hissy fit and creating a config option to work around the
buggy code.

Signed-off-by: Rusty Russell <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Rusty Russell 2008-05-09 16:25:28 +10:00 • committed by Linus Torvalds
commit 91e37a793b
2 changed files with 13 additions and 9 deletions
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6
init/Kconfig
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@ -845,9 +845,9 @@ config MODULE_FORCE_LOAD
depends on MODULES
default n
help
This option allows loading of modules even if that would set the
'F' (forced) taint, due to lack of version info. Which is
usually a really bad idea.
Allow loading of modules without version information (ie. modprobe
--force). Forced module loading sets the 'F' (forced) taint flag and
is usually a really bad idea.
config MODULE_UNLOAD
bool "Module unloading"