diff options
author | Richard Henderson <richard.henderson@linaro.org> | 2022-11-30 23:45:22 -0800 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-12-01 09:53:24 +0100 |
commit | 8218c048be1567db9dfd3cf1e19fbff76bce8cfd (patch) | |
tree | ec48a710457947bdec939b85cb449d3be7571d5f | |
parent | 38e65936a8df1c9e7f5d19eae38a42133fab844b (diff) | |
download | qemu-8218c048be1567db9dfd3cf1e19fbff76bce8cfd.zip qemu-8218c048be1567db9dfd3cf1e19fbff76bce8cfd.tar.gz qemu-8218c048be1567db9dfd3cf1e19fbff76bce8cfd.tar.bz2 |
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: 9bbcf372193a ("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>
-rw-r--r-- | target/i386/tcg/sysemu/excp_helper.c | 34 |
1 files changed, 19 insertions, 15 deletions
diff --git a/target/i386/tcg/sysemu/excp_helper.c b/target/i386/tcg/sysemu/excp_helper.c index 405a5d4..55bd119 100644 --- a/target/i386/tcg/sysemu/excp_helper.c +++ b/target/i386/tcg/sysemu/excp_helper.c @@ -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; } } |