powerpc/64/module: REL32 relocation range check

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The recent module relocation overflow crash demonstrated that we
have no range checking on REL32 relative relocations. This patch
implements a basic check, the same kernel that previously oopsed
and rebooted now continues with some of these errors when loading
the module:

  module_64: x_tables: REL32 527703503449812 out of range!

Possibly other relocations (ADDR32, REL16, TOC16, etc.) should also have
overflow checks.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Nicholas Piggin 2018-08-29 21:56:56 +10:00 • committed by Greg Kroah-Hartman

parent 54de3d7d55

commit 63880b2f99

1 changed files with 8 additions and 1 deletions

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arch/powerpc/kernel/module_64.c

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