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| author |   Jason Yan <yanaijie@huawei.com> | 2019-09-20 17:45:42 +0800 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-11-13 19:27:44 +1100 |
| commit | b39609720069f5a6eed2b3e3f618c23587021ff5 (patch) | |
| tree | fdc9e2385223bbf0eea7b07051b28ded0b190885 /arch/powerpc/mm/nohash/kaslr_booke.c | |
| parent | powerpc/fsl_booke/32: randomize the kernel image offset (diff) | |
| download | linux-dev-b39609720069f5a6eed2b3e3f618c23587021ff5.tar.xz linux-dev-b39609720069f5a6eed2b3e3f618c23587021ff5.zip | |
powerpc/fsl_booke/kaslr: clear the original kernel if randomized
The original kernel still exists in the memory, clear it now.
Signed-off-by: Jason Yan <yanaijie@huawei.com>
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Diana Craciun <diana.craciun@nxp.com>
Tested-by: Diana Craciun <diana.craciun@nxp.com>
Signed-off-by: Scott Wood <oss@buserror.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/mm/nohash/kaslr_booke.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/mm/nohash/kaslr_booke.c b/arch/powerpc/mm/nohash/kaslr_booke.c index 7b238fc2c8a9..aa1b60c782e7 100644 --- a/arch/powerpc/mm/nohash/kaslr_booke.c +++ b/arch/powerpc/mm/nohash/kaslr_booke.c @@ -381,3 +381,14 @@ notrace void __init kaslr_early_init(void *dt_ptr, phys_addr_t size) reloc_kernel_entry(dt_ptr, kernstart_virt_addr); } + +void __init kaslr_late_init(void) +{ + /* If randomized, clear the original kernel */ + if (kernstart_virt_addr != KERNELBASE) { + unsigned long kernel_sz; + + kernel_sz = (unsigned long)_end - kernstart_virt_addr; + memzero_explicit((void *)KERNELBASE, kernel_sz); + } +} |