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x86: Use __nostackprotect for sme_encrypt_kernel 

Commit bacf6b499e ("x86/mm: Use a struct to reduce parameters for SME
PGD mapping") moved some parameters into a structure.

The structure was large enough to trigger the stack protection canary in
sme_encrypt_kernel which doesn't work this early, causing reboots.

Mark sme_encrypt_kernel appropriately to not use the canary.

Fixes: bacf6b499e ("x86/mm: Use a struct to reduce parameters for SME PGD mapping")
Signed-off-by: Laura Abbott <labbott@redhat.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Laura Abbott 2018-01-20 17:14:02 -08:00 committed by Linus Torvalds
parent 24b6124047
commit 91cfc88c66
1 changed files with 1 additions and 1 deletions
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2
arch/x86/mm/mem_encrypt.c
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@ -738,7 +738,7 @@ static unsigned long __init sme_pgtable_calc(unsigned long len)
return total;
}
void __init sme_encrypt_kernel(struct boot_params *bp)
void __init __nostackprotector sme_encrypt_kernel(struct boot_params *bp)
{
unsigned long workarea_start, workarea_end, workarea_len;
unsigned long execute_start, execute_end, execute_len;