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kbuild: modversions: add infrastructure for emitting relative CRCs

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This add the kbuild infrastructure that will allow architectures to emit
vmlinux symbol CRCs as 32-bit offsets to another location in the kernel
where the actual value is stored. This works around problems with CRCs
being mistaken for relocatable symbols on kernels that self relocate at
runtime (i.e., powerpc with CONFIG_RELOCATABLE=y)

For the kbuild side of things, this comes down to the following:

 - introducing a Kconfig symbol MODULE_REL_CRCS

 - adding a -R switch to genksyms to instruct it to emit the CRC symbols
   as references into the .rodata section

 - making modpost distinguish such references from absolute CRC symbols
   by the section index (SHN_ABS)

 - making kallsyms disregard non-absolute symbols with a __crc_ prefix

Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ard Biesheuvel 2017-02-03 09:54:05 +00:00 • committed by Linus Torvalds
commit 56067812d5
5 changed files with 42 additions and 5 deletions
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4
init/Kconfig
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@ -1987,6 +1987,10 @@ config MODVERSIONS
make them incompatible with the kernel you are running. If
unsure, say N.
config MODULE_REL_CRCS
bool
depends on MODVERSIONS
config MODULE_SRCVERSION_ALL
bool "Source checksum for all modules"
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