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target/i386: Always completely initialize TranslateFault 

In get_physical_address, the canonical address check failed to
set TranslateFault.stage2, which resulted in an uninitialized
read from the struct when reporting the fault in x86_cpu_tlb_fill.

Adjust all error paths to use structure assignment so that the
entire struct is always initialized.

Reported-by: Daniel Hoffman <dhoff749@gmail.com>
Fixes: 9bbcf37219 ("target/i386: Reorg GET_HPHYS")
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20221201074522.178498-1-richard.henderson@linaro.org>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1324
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Richard Henderson 2022-11-30 23:45:22 -08:00 committed by Paolo Bonzini
parent 38e65936a8
commit 8218c048be
1 changed files with 19 additions and 15 deletions
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34
target/i386/tcg/sysemu/excp_helper.c
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@ -71,10 +71,11 @@ static bool ptw_translate(PTETranslate *inout, hwaddr addr)
TranslateFault *err = inout->err;
assert(inout->ptw_idx == MMU_NESTED_IDX);
err->exception_index = 0; /* unused */
err->error_code = inout->env->error_code;
err->cr2 = addr;
err->stage2 = S2_GPT;
*err = (TranslateFault){
.error_code = inout->env->error_code,
.cr2 = addr,
.stage2 = S2_GPT,
};
return false;
}
return true;
@ -431,10 +432,11 @@ do_check_protect_pse36:
MMU_NESTED_IDX, true,
&pte_trans.haddr, &full, 0);
if (unlikely(flags & TLB_INVALID_MASK)) {
err->exception_index = 0; /* unused */
err->error_code = env->error_code;
err->cr2 = paddr;
err->stage2 = S2_GPA;
*err = (TranslateFault){
.error_code = env->error_code,
.cr2 = paddr,
.stage2 = S2_GPA,
};
return false;
}
@ -494,10 +496,11 @@ do_check_protect_pse36:
}
break;
}
err->exception_index = EXCP0E_PAGE;
err->error_code = error_code;
err->cr2 = addr;
err->stage2 = S2_NONE;
*err = (TranslateFault){
.exception_index = EXCP0E_PAGE,
.error_code = error_code,
.cr2 = addr,
};
return false;
}
@ -564,9 +567,10 @@ static bool get_physical_address(CPUX86State *env, vaddr addr,
int shift = in.pg_mode & PG_MODE_LA57 ? 56 : 47;
int64_t sext = (int64_t)addr >> shift;
if (sext != 0 && sext != -1) {
err->exception_index = EXCP0D_GPF;
err->error_code = 0;
err->cr2 = addr;
*err = (TranslateFault){
.exception_index = EXCP0D_GPF,
.cr2 = addr,
};
return false;
}
}