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virt: sev-guest: Replace GFP_KERNEL_ACCOUNT with GFP_KERNEL

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Replace GFP_KERNEL_ACCOUNT with GFP_KERNEL in the sev-guest driver code.
GFP_KERNEL_ACCOUNT is typically used for accounting untrusted userspace
allocations. After auditing the sev-guest code, the following changes are
necessary:

  * snp_init_crypto(): Use GFP_KERNEL as this is a trusted device probe
    path.

Retain GFP_KERNEL_ACCOUNT in the following cases for robustness and
specific path requirements:

  * alloc_shared_pages(): Although all allocations are limited, retain
    GFP_KERNEL_ACCOUNT for future robustness.

  * get_report() and get_ext_report(): These functions are on the unlocked
    ioctl path and should continue using GFP_KERNEL_ACCOUNT.

Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20250106124633.1418972-3-nikunj@amd.com
This commit is contained in:
Nikunj A Dadhania 2025-01-06 18:16:22 +05:30 committed by Borislav Petkov (AMD)
parent 8234177d20
commit 864884a0c2
1 changed files with 1 additions and 1 deletions
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2
drivers/virt/coco/sev-guest/sev-guest.c
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@ -141,7 +141,7 @@ static struct aesgcm_ctx *snp_init_crypto(u8 *key, size_t keylen)
{
struct aesgcm_ctx *ctx;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT);
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return NULL;