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helper_idivw_AX() and helper_idivl_EAX() perform the divis= ion before
checking whether the quotient fits in the destination.=C2=A0 = If the dividend
is the minimum value and the divisor is -1, the division= overflows in
the host: INT32_MIN / -1 and INT64_MIN / -1 are undefined = behaviour in C
and trap with SIGFPE on x86 hosts.=C2=A0 QEMU then dies o= f a host SIGFPE
instead of raising #DE in the guest, taking down the emu= lator (or the
whole VM under TCG).

Reject the two overflowing cas= es before dividing.=C2=A0 The 8-bit form is not
affected (it widens the = dividend to int), and the 64-bit form already
checks first.

Add a= regression test for both the 16-bit and 32-bit forms, run by the
i386 a= nd x86_64 linux-user test suites.

Resolves: https://gitlab.com/qemu-project/qemu= /-/issues/4687
Signed-off-by: fujo <hooyan2024@gmail.com>
---
=C2=A0target/i386/tcg/int= _helper.c =C2=A0 =C2=A0 =C2=A0 =C2=A0| =C2=A04 +-
=C2=A0tests/tcg/i386/m= eson.build =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0| =C2=A01 +
=C2=A0tests/tcg= /i386/test-idiv-overflow.c | 70 +++++++++++++++++++++++++++++
=C2=A0test= s/tcg/x86_64/meson.build =C2=A0 =C2=A0 =C2=A0 =C2=A0| =C2=A01 +
=C2=A04 = files changed, 74 insertions(+), 2 deletions(-)
=C2=A0create mode 100644= tests/tcg/i386/test-idiv-overflow.c

diff --git a/target/i386/tcg/in= t_helper.c b/target/i386/tcg/int_helper.c
index 46741d9..45fa0a8 100644<= br>--- a/target/i386/tcg/int_helper.c
+++ b/target/i386/tcg/int_helper.c=
@@ -91,7 +91,7 @@ void helper_idivw_AX(CPUX86State *env, target_ulong t= 0)
=C2=A0
=C2=A0 =C2=A0 =C2=A0num =3D (env->regs[R_EAX] & 0xff= ff) | ((env->regs[R_EDX] & 0xffff) << 16);
=C2=A0 =C2=A0 = =C2=A0den =3D (int16_t)t0;
- =C2=A0 =C2=A0if (den =3D=3D 0) {
+ =C2= =A0 =C2=A0if (den =3D=3D 0 || (num =3D=3D INT32_MIN && den =3D=3D -= 1)) {
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0raise_exception_ra(env, EXCP00_D= IVZ, GETPC());
=C2=A0 =C2=A0 =C2=A0}
=C2=A0 =C2=A0 =C2=A0q =3D (num /= den);
@@ -130,7 +130,7 @@ void helper_idivl_EAX(CPUX86State *env, targe= t_ulong t0)
=C2=A0
=C2=A0 =C2=A0 =C2=A0num =3D ((uint32_t)env->reg= s[R_EAX]) | ((uint64_t)((uint32_t)env->regs[R_EDX]) << 32);
=C2= =A0 =C2=A0 =C2=A0den =3D t0;
- =C2=A0 =C2=A0if (den =3D=3D 0) {
+ =C2= =A0 =C2=A0if (den =3D=3D 0 || (num =3D=3D INT64_MIN && den =3D=3D -= 1)) {
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0raise_exception_ra(env, EXCP00_D= IVZ, GETPC());
=C2=A0 =C2=A0 =C2=A0}
=C2=A0 =C2=A0 =C2=A0q =3D (num /= den);
diff --git a/tests/tcg/i386/meson.build b/tests/tcg/i386/meson.bu= ild
index 84bd680..5d88858 100644
--- a/tests/tcg/i386/meson.build+++ b/tests/tcg/i386/meson.build
@@ -38,6 +38,7 @@ tests +=3D {
=C2= =A0 =C2=A0 =C2=A0'cflags': [files('test-i386-code16.S'), fi= les('test-i386-vm86.S'),
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 '-lm', '-fno-pie', '-Wl,--no-warn-rwx= -segments'],
=C2=A0 =C2=A0},
+ =C2=A0'test-idiv-overflow.c= 9;: {},
=C2=A0 =C2=A0'../multiarch/sha512.c': {
=C2=A0 =C2=A0= =C2=A0 'exe_name': 'sha512-sse',
=C2=A0 =C2=A0 =C2=A0 &= #39;cflags': ['-msse4.1', '-O3'],
diff --git a/tests= /tcg/i386/test-idiv-overflow.c b/tests/tcg/i386/test-idiv-overflow.c
new= file mode 100644
index 0000000..e8fc55a
--- /dev/null
+++ b/tests= /tcg/i386/test-idiv-overflow.c
@@ -0,0 +1,70 @@
+/* SPDX-License-Iden= tifier: GPL-2.0-or-later */
+/*
+ * Test that IDIV of the minimum div= idend by -1 raises #DE, which Linux
+ * delivers to the guest as SIGFPE = with si_code =3D=3D FPE_INTDIV.
+ */
+#define _GNU_SOURCE
+#includ= e <setjmp.h>
+#include <signal.h>
+#include <stdio.h&g= t;
+#include <string.h>
+
+static sigjmp_buf idiv_jmp;
+s= tatic volatile sig_atomic_t idiv_si_code;
+
+static void idiv_sig_han= dler(int sig, siginfo_t *info, void *puc)
+{
+ =C2=A0 =C2=A0(void)sig= ;
+ =C2=A0 =C2=A0(void)puc;
+ =C2=A0 =C2=A0idiv_si_code =3D info->= si_code;
+ =C2=A0 =C2=A0siglongjmp(idiv_jmp, 1);
+}
+
+static i= nt check_idiv_overflow(int width)
+{
+ =C2=A0 =C2=A0struct sigaction = sa, old;
+ =C2=A0 =C2=A0int ret =3D 1;
+
+ =C2=A0 =C2=A0memset(&am= p;sa, 0, sizeof(sa));
+ =C2=A0 =C2=A0sa.sa_sigaction =3D idiv_sig_handle= r;
+ =C2=A0 =C2=A0sa.sa_flags =3D SA_SIGINFO | SA_NODEFER;
+ =C2=A0 = =C2=A0sigemptyset(&sa.sa_mask);
+ =C2=A0 =C2=A0sigaction(SIGFPE, &am= p;sa, &old);
+
+ =C2=A0 =C2=A0idiv_si_code =3D 0;
+ =C2=A0 =C2= =A0if (sigsetjmp(idiv_jmp, 1) =3D=3D 0) {
+ =C2=A0 =C2=A0 =C2=A0 =C2=A0i= f (width =3D=3D 16) {
+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0/* DX:A= X =3D 0x8000:0x0000, divisor -1 */
+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0__asm__ volatile ("movl $0x8000, %%edx\n\t"
+ =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0"xorl %%eax, %%eax\n\t"
+ =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0"movl $-1, %%ecx\n\t"
+ =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0"idivw %%cx"
+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: : : = "eax", "ecx", "edx", "cc");
+ = =C2=A0 =C2=A0 =C2=A0 =C2=A0} else {
+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0= =C2=A0/* EDX:EAX =3D 0x80000000:0x00000000, divisor -1 */
+ =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0__asm__ volatile ("movl $0x80000000, %%= edx\n\t"
+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0"xorl %%eax, %%eax\n\t= "
+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0"movl $-1, %%ecx\n\t"+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0"idivl %%ecx"
+ =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0: : : "eax", "ecx", "edx"= , "cc");
+ =C2=A0 =C2=A0 =C2=A0 =C2=A0}
+ =C2=A0 =C2=A0 =C2= =A0 =C2=A0printf("FAIL: idiv%d did not raise #DE\n", width);
+= =C2=A0 =C2=A0} else if (idiv_si_code !=3D FPE_INTDIV) {
+ =C2=A0 =C2=A0= =C2=A0 =C2=A0printf("FAIL: idiv%d raised SIGFPE with si_code %d\n&quo= t;,
+ =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 width, (int)idiv_= si_code);
+ =C2=A0 =C2=A0} else {
+ =C2=A0 =C2=A0 =C2=A0 =C2=A0ret = =3D 0;
+ =C2=A0 =C2=A0}
+
+ =C2=A0 =C2=A0sigaction(SIGFPE, &ol= d, NULL);
+ =C2=A0 =C2=A0return ret;
+}
+
+int main(void)
+{=
+ =C2=A0 =C2=A0int ret =3D 0;
+
+ =C2=A0 =C2=A0ret |=3D check_idi= v_overflow(16);
+ =C2=A0 =C2=A0ret |=3D check_idiv_overflow(32);
+ = =C2=A0 =C2=A0return ret;
+}
diff --git a/tests/tcg/x86_64/meson.build= b/tests/tcg/x86_64/meson.build
index 95c7ee6..4106d4d 100644
--- a/t= ests/tcg/x86_64/meson.build
+++ b/tests/tcg/x86_64/meson.build
@@ -52= ,6 +52,7 @@ tests +=3D {
=C2=A0 =C2=A0},
=C2=A0 =C2=A0'../i386/te= st-i386-adcox.c': {'cflags': ['-O2']},
=C2=A0 =C2=A0= '../i386/test-i386-bmi2.c': {'cflags': ['-O2', '= ;-fwrapv']},
+ =C2=A0'../i386/test-idiv-overflow.c': {},
= =C2=A0}
=C2=A0
=C2=A0tests +=3D {
--
2.53.0

--0000000000002b1865065dffb534--