46 lines
1.7 KiB
Diff
46 lines
1.7 KiB
Diff
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# Commit d0a718a45f14b86471d8eb3083acd72760963470
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# Date 2024-04-11 13:23:08 +0100
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# Author Andrew Cooper <andrew.cooper3@citrix.com>
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# Committer Andrew Cooper <andrew.cooper3@citrix.com>
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x86/hvm: Fix Misra Rule 19.1 regression
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Despite noticing an impending Rule 19.1 violation, the adjustment made (the
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uint32_t cast) wasn't sufficient to avoid it. Try again.
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Subsequently noticed by Coverity too.
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Fixes: 6a98383b0877 ("x86/HVM: clear upper halves of GPRs upon entry from 32-bit code")
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Coverity-IDs: 1596289 thru 1596298
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Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
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Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
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--- a/xen/arch/x86/include/asm/hvm/hvm.h
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+++ b/xen/arch/x86/include/asm/hvm/hvm.h
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@@ -585,16 +585,16 @@ static inline void hvm_sanitize_regs_fie
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if ( compat )
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{
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/* Clear GPR upper halves, to counteract guests playing games. */
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- regs->rbp = (uint32_t)regs->ebp;
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- regs->rbx = (uint32_t)regs->ebx;
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- regs->rax = (uint32_t)regs->eax;
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- regs->rcx = (uint32_t)regs->ecx;
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- regs->rdx = (uint32_t)regs->edx;
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- regs->rsi = (uint32_t)regs->esi;
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- regs->rdi = (uint32_t)regs->edi;
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- regs->rip = (uint32_t)regs->eip;
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- regs->rflags = (uint32_t)regs->eflags;
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- regs->rsp = (uint32_t)regs->esp;
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+ regs->rbp = (uint32_t)regs->rbp;
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+ regs->rbx = (uint32_t)regs->rbx;
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+ regs->rax = (uint32_t)regs->rax;
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+ regs->rcx = (uint32_t)regs->rcx;
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+ regs->rdx = (uint32_t)regs->rdx;
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+ regs->rsi = (uint32_t)regs->rsi;
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+ regs->rdi = (uint32_t)regs->rdi;
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+ regs->rip = (uint32_t)regs->rip;
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+ regs->rflags = (uint32_t)regs->rflags;
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+ regs->rsp = (uint32_t)regs->rsp;
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}
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#ifndef NDEBUG
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