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| author | Sebastian Andrzej Siewior <[email protected]> | 2025-06-10 16:33:28 +0000 |
|---|---|---|
| committer | Daniel Gomez <[email protected]> | 2025-07-08 18:52:30 +0000 |
| commit | 570db4b39f535a8bb722adb8be0280d09e34ca99 (patch) | |
| tree | 67412e8605e19f9f70267f7e71d093f06638ebeb /drivers/fpga/microchip-spi.c | |
| parent | module: Avoid unnecessary return value initialization in move_module() (diff) | |
| download | kernel-570db4b39f535a8bb722adb8be0280d09e34ca99.tar.gz kernel-570db4b39f535a8bb722adb8be0280d09e34ca99.zip | |
module: Make sure relocations are applied to the per-CPU section
The per-CPU data section is handled differently than the other sections.
The memory allocations requires a special __percpu pointer and then the
section is copied into the view of each CPU. Therefore the SHF_ALLOC
flag is removed to ensure move_module() skips it.
Later, relocations are applied and apply_relocations() skips sections
without SHF_ALLOC because they have not been copied. This also skips the
per-CPU data section.
The missing relocations result in a NULL pointer on x86-64 and very
small values on x86-32. This results in a crash because it is not
skipped like NULL pointer would and can't be dereferenced.
Such an assignment happens during static per-CPU lock initialisation
with lockdep enabled.
Allow relocation processing for the per-CPU section even if SHF_ALLOC is
missing.
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-lkp/[email protected]
Fixes: 1a6100caae425 ("Don't relocate non-allocated regions in modules.") #v2.6.1-rc3
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Reviewed-by: Petr Pavlu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Daniel Gomez <[email protected]>
Message-ID: <[email protected]>
Diffstat (limited to 'drivers/fpga/microchip-spi.c')
0 files changed, 0 insertions, 0 deletions