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ANDROID: virt: gunyah: Check GUNYAH_VM_SET_BOOT_CONTEXT reg upper bits

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Test that the boot_context->reg provided by userspace has upper bits
cleared.

Change-Id: If96f7980b026336def24f8ff88d303d0bfa7b598
Bug: 373872273
Fixes: ed8ebd8c80c5 ("FROMLIST: virt: gunyah: Allow userspace to initialize context of primary vCPU")
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
Signed-off-by: Elliot Berman <elliot.berman@oss.qualcomm.com>
This commit is contained in:
Elliot Berman
2024-10-16 10:14:29 -07:00
committed by Treehugger Robot
parent 1a2d547525
commit 86fff7cab3
1 changed files with 5 additions and 0 deletions
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drivers/virt/gunyah/vm_mgr.c
+5
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@@ -27,6 +27,8 @@
// "From" extent for memory private to guest
#define GUNYAH_VM_MEM_EXTENT_HOST_PRIVATE_LABEL 2
#define BOOT_CONTEXT_REG_MASK GUNYAH_VM_BOOT_CONTEXT_REG(0xff, 0xff)
static DEFINE_XARRAY(gunyah_vm_functions);
static void gunyah_vm_put_function(struct gunyah_vm_function *fn)
@@ -551,6 +553,9 @@ static long gunyah_vm_set_boot_context(struct gunyah_vm *ghvm,
u8 reg_set, reg_index; /* to check values are reasonable */
int ret;
if (boot_ctx->reg & ~BOOT_CONTEXT_REG_MASK)
return -EINVAL;
reg_set = (boot_ctx->reg >> GUNYAH_VM_BOOT_CONTEXT_REG_SHIFT) & 0xff;
reg_index = boot_ctx->reg & 0xff;