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From: Laurent Vivier <laurent@vivier.eu>
To: qemu-devel@nongnu.org
Cc: Richard Henderson <richard.henderson@linaro.org>,
	Laurent Vivier <laurent@vivier.eu>
Subject: [PULL 09/59] linux-user: Use target_restore_altstack in all sigreturn
Date: Mon, 17 May 2021 20:13:34 +0200	[thread overview]
Message-ID: <20210517181424.8093-10-laurent@vivier.eu> (raw)
In-Reply-To: <20210517181424.8093-1-laurent@vivier.eu>

From: Richard Henderson <richard.henderson@linaro.org>

Note that target_restore_altstack uses the host memory
pointer that we have already verified, so TARGET_EFAULT
is not a possible return value.

Note that using -EFAULT was a bug.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210426025334.1168495-3-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 linux-user/aarch64/signal.c    | 6 +-----
 linux-user/alpha/signal.c      | 6 +-----
 linux-user/arm/signal.c        | 9 ++-------
 linux-user/hexagon/signal.c    | 6 +-----
 linux-user/hppa/signal.c       | 8 +-------
 linux-user/i386/signal.c       | 5 +----
 linux-user/m68k/signal.c       | 5 +----
 linux-user/microblaze/signal.c | 6 +-----
 linux-user/mips/signal.c       | 6 +-----
 linux-user/nios2/signal.c      | 8 +-------
 linux-user/openrisc/signal.c   | 5 +----
 linux-user/ppc/signal.c        | 4 +---
 linux-user/riscv/signal.c      | 6 +-----
 linux-user/s390x/signal.c      | 6 ++----
 linux-user/sh4/signal.c        | 7 +------
 linux-user/xtensa/signal.c     | 6 +-----
 16 files changed, 18 insertions(+), 81 deletions(-)

diff --git a/linux-user/aarch64/signal.c b/linux-user/aarch64/signal.c
index b591790c22ed..2a1b7dbcdc2b 100644
--- a/linux-user/aarch64/signal.c
+++ b/linux-user/aarch64/signal.c
@@ -561,11 +561,7 @@ long do_rt_sigreturn(CPUARMState *env)
         goto badframe;
     }
 
-    if (do_sigaltstack(frame_addr +
-            offsetof(struct target_rt_sigframe, uc.tuc_stack),
-            0, get_sp_from_cpustate(env)) == -EFAULT) {
-        goto badframe;
-    }
+    target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
 
     unlock_user_struct(frame, frame_addr, 0);
     return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/alpha/signal.c b/linux-user/alpha/signal.c
index c5c27ce08419..0af022711815 100644
--- a/linux-user/alpha/signal.c
+++ b/linux-user/alpha/signal.c
@@ -257,11 +257,7 @@ long do_rt_sigreturn(CPUAlphaState *env)
     set_sigmask(&set);
 
     restore_sigcontext(env, &frame->uc.tuc_mcontext);
-    if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
-                                             uc.tuc_stack),
-                       0, env->ir[IR_SP]) == -EFAULT) {
-        goto badframe;
-    }
+    target_restore_altstack(&frame->uc.tuc_stack, env->ir[IR_SP]);
 
     unlock_user_struct(frame, frame_addr, 0);
     return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/arm/signal.c b/linux-user/arm/signal.c
index f21d1535e4d9..b7a772302f45 100644
--- a/linux-user/arm/signal.c
+++ b/linux-user/arm/signal.c
@@ -685,11 +685,7 @@ static int do_sigframe_return_v2(CPUARMState *env,
         }
     }
 
-    if (do_sigaltstack(context_addr
-                       + offsetof(struct target_ucontext_v2, tuc_stack),
-                       0, get_sp_from_cpustate(env)) == -EFAULT) {
-        return 1;
-    }
+    target_restore_altstack(&uc->tuc_stack, get_sp_from_cpustate(env));
 
 #if 0
     /* Send SIGTRAP if we're single-stepping */
@@ -773,8 +769,7 @@ static long do_rt_sigreturn_v1(CPUARMState *env)
         goto badframe;
     }
 
-    if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe_v1, uc.tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT)
-        goto badframe;
+    target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
 
 #if 0
     /* Send SIGTRAP if we're single-stepping */
diff --git a/linux-user/hexagon/signal.c b/linux-user/hexagon/signal.c
index fde8dc93b7a6..3854eb4709be 100644
--- a/linux-user/hexagon/signal.c
+++ b/linux-user/hexagon/signal.c
@@ -260,11 +260,7 @@ long do_rt_sigreturn(CPUHexagonState *env)
     }
 
     restore_ucontext(env, &frame->uc);
-
-    if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
-            uc.uc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) {
-        goto badframe;
-    }
+    target_restore_altstack(&frame->uc.uc_stack, get_sp_from_cpustate(env));
 
     unlock_user_struct(frame, frame_addr, 0);
     return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/hppa/signal.c b/linux-user/hppa/signal.c
index d1a58feeb36f..578874cf27e6 100644
--- a/linux-user/hppa/signal.c
+++ b/linux-user/hppa/signal.c
@@ -187,13 +187,7 @@ long do_rt_sigreturn(CPUArchState *env)
     set_sigmask(&set);
 
     restore_sigcontext(env, &frame->uc.tuc_mcontext);
-    unlock_user_struct(frame, frame_addr, 0);
-
-    if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
-                                             uc.tuc_stack),
-                       0, env->gr[30]) == -EFAULT) {
-        goto badframe;
-    }
+    target_restore_altstack(&frame->uc.tuc_stack, env->gr[30]);
 
     unlock_user_struct(frame, frame_addr, 0);
     return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/i386/signal.c b/linux-user/i386/signal.c
index 9320e1d47267..3a0a1546a63e 100644
--- a/linux-user/i386/signal.c
+++ b/linux-user/i386/signal.c
@@ -581,10 +581,7 @@ long do_rt_sigreturn(CPUX86State *env)
         goto badframe;
     }
 
-    if (do_sigaltstack(frame_addr + offsetof(struct rt_sigframe, uc.tuc_stack), 0,
-                       get_sp_from_cpustate(env)) == -EFAULT) {
-        goto badframe;
-    }
+    target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
 
     unlock_user_struct(frame, frame_addr, 0);
     return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/m68k/signal.c b/linux-user/m68k/signal.c
index 49ff87c77bce..004b59fb6118 100644
--- a/linux-user/m68k/signal.c
+++ b/linux-user/m68k/signal.c
@@ -400,10 +400,7 @@ long do_rt_sigreturn(CPUM68KState *env)
     if (target_rt_restore_ucontext(env, &frame->uc))
         goto badframe;
 
-    if (do_sigaltstack(frame_addr +
-                       offsetof(struct target_rt_sigframe, uc.tuc_stack),
-                       0, get_sp_from_cpustate(env)) == -EFAULT)
-        goto badframe;
+    target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
 
     unlock_user_struct(frame, frame_addr, 0);
     return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/microblaze/signal.c b/linux-user/microblaze/signal.c
index cf0707b5564b..f59a1faf47bb 100644
--- a/linux-user/microblaze/signal.c
+++ b/linux-user/microblaze/signal.c
@@ -209,11 +209,7 @@ long do_rt_sigreturn(CPUMBState *env)
 
     restore_sigcontext(&frame->uc.tuc_mcontext, env);
 
-    if (do_sigaltstack(frame_addr +
-                       offsetof(struct target_rt_sigframe, uc.tuc_stack),
-                       0, get_sp_from_cpustate(env)) == -EFAULT) {
-        goto badframe;
-    }
+    target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
 
     unlock_user_struct(frame, frame_addr, 0);
     return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/mips/signal.c b/linux-user/mips/signal.c
index 455a8a229a83..456fa64f41cd 100644
--- a/linux-user/mips/signal.c
+++ b/linux-user/mips/signal.c
@@ -368,11 +368,7 @@ long do_rt_sigreturn(CPUMIPSState *env)
     set_sigmask(&blocked);
 
     restore_sigcontext(env, &frame->rs_uc.tuc_mcontext);
-
-    if (do_sigaltstack(frame_addr +
-                       offsetof(struct target_rt_sigframe, rs_uc.tuc_stack),
-                       0, get_sp_from_cpustate(env)) == -EFAULT)
-        goto badframe;
+    target_restore_altstack(&frame->rs_uc.tuc_stack, get_sp_from_cpustate(env));
 
     env->active_tc.PC = env->CP0_EPC;
     mips_set_hflags_isa_mode_from_pc(env);
diff --git a/linux-user/nios2/signal.c b/linux-user/nios2/signal.c
index 7d535065ed98..751ea88811f8 100644
--- a/linux-user/nios2/signal.c
+++ b/linux-user/nios2/signal.c
@@ -82,9 +82,7 @@ static int rt_restore_ucontext(CPUNios2State *env, struct target_ucontext *uc,
                                int *pr2)
 {
     int temp;
-    abi_ulong off, frame_addr = env->regs[R_SP];
     unsigned long *gregs = uc->tuc_mcontext.gregs;
-    int err;
 
     /* Always make any pending restarted system calls return -EINTR */
     /* current->restart_block.fn = do_no_restart_syscall; */
@@ -130,11 +128,7 @@ static int rt_restore_ucontext(CPUNios2State *env, struct target_ucontext *uc,
     __get_user(env->regs[R_RA], &gregs[23]);
     __get_user(env->regs[R_SP], &gregs[28]);
 
-    off = offsetof(struct target_rt_sigframe, uc.tuc_stack);
-    err = do_sigaltstack(frame_addr + off, 0, get_sp_from_cpustate(env));
-    if (err == -EFAULT) {
-        return 1;
-    }
+    target_restore_altstack(&uc->tuc_stack, get_sp_from_cpustate(env));
 
     *pr2 = env->regs[2];
     return 0;
diff --git a/linux-user/openrisc/signal.c b/linux-user/openrisc/signal.c
index 232ad82b98be..86f94d7f766d 100644
--- a/linux-user/openrisc/signal.c
+++ b/linux-user/openrisc/signal.c
@@ -158,10 +158,7 @@ long do_rt_sigreturn(CPUOpenRISCState *env)
     set_sigmask(&set);
 
     restore_sigcontext(env, &frame->uc.tuc_mcontext);
-    if (do_sigaltstack(frame_addr + offsetof(target_rt_sigframe, uc.tuc_stack),
-                       0, frame_addr) == -EFAULT) {
-        goto badframe;
-    }
+    target_restore_altstack(&frame->uc.tuc_stack, frame_addr);
 
     unlock_user_struct(frame, frame_addr, 0);
     return cpu_get_gpr(env, 11);
diff --git a/linux-user/ppc/signal.c b/linux-user/ppc/signal.c
index bad38f8ed9b1..b44d5ce73c31 100644
--- a/linux-user/ppc/signal.c
+++ b/linux-user/ppc/signal.c
@@ -655,9 +655,7 @@ long do_rt_sigreturn(CPUPPCState *env)
     if (do_setcontext(&rt_sf->uc, env, 1))
         goto sigsegv;
 
-    do_sigaltstack(rt_sf_addr
-                   + offsetof(struct target_rt_sigframe, uc.tuc_stack),
-                   0, env->gpr[1]);
+    target_restore_altstack(&rt_sf->uc.tuc_stack, env->gpr[1]);
 
     unlock_user_struct(rt_sf, rt_sf_addr, 1);
     return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/riscv/signal.c b/linux-user/riscv/signal.c
index 67a95dbc7b91..81d1129da3d2 100644
--- a/linux-user/riscv/signal.c
+++ b/linux-user/riscv/signal.c
@@ -192,11 +192,7 @@ long do_rt_sigreturn(CPURISCVState *env)
     }
 
     restore_ucontext(env, &frame->uc);
-
-    if (do_sigaltstack(frame_addr + offsetof(struct target_rt_sigframe,
-            uc.uc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) {
-        goto badframe;
-    }
+    target_restore_altstack(&frame->uc.uc_stack, get_sp_from_cpustate(env));
 
     unlock_user_struct(frame, frame_addr, 0);
     return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/s390x/signal.c b/linux-user/s390x/signal.c
index 7107c5fb5335..73806f547270 100644
--- a/linux-user/s390x/signal.c
+++ b/linux-user/s390x/signal.c
@@ -307,10 +307,8 @@ long do_rt_sigreturn(CPUS390XState *env)
         goto badframe;
     }
 
-    if (do_sigaltstack(frame_addr + offsetof(rt_sigframe, uc.tuc_stack), 0,
-                       get_sp_from_cpustate(env)) == -EFAULT) {
-        goto badframe;
-    }
+    target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
+
     unlock_user_struct(frame, frame_addr, 0);
     return -TARGET_QEMU_ESIGRETURN;
 
diff --git a/linux-user/sh4/signal.c b/linux-user/sh4/signal.c
index 29c1ee30e6d6..684f18da5862 100644
--- a/linux-user/sh4/signal.c
+++ b/linux-user/sh4/signal.c
@@ -323,12 +323,7 @@ long do_rt_sigreturn(CPUSH4State *regs)
     set_sigmask(&blocked);
 
     restore_sigcontext(regs, &frame->uc.tuc_mcontext);
-
-    if (do_sigaltstack(frame_addr +
-                       offsetof(struct target_rt_sigframe, uc.tuc_stack),
-                       0, get_sp_from_cpustate(regs)) == -EFAULT) {
-        goto badframe;
-    }
+    target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(regs));
 
     unlock_user_struct(frame, frame_addr, 0);
     return -TARGET_QEMU_ESIGRETURN;
diff --git a/linux-user/xtensa/signal.c b/linux-user/xtensa/signal.c
index 590f0313ffe9..22ec6cdeb98e 100644
--- a/linux-user/xtensa/signal.c
+++ b/linux-user/xtensa/signal.c
@@ -253,12 +253,8 @@ long do_rt_sigreturn(CPUXtensaState *env)
     set_sigmask(&set);
 
     restore_sigcontext(env, frame);
+    target_restore_altstack(&frame->uc.tuc_stack, get_sp_from_cpustate(env));
 
-    if (do_sigaltstack(frame_addr +
-                       offsetof(struct target_rt_sigframe, uc.tuc_stack),
-                       0, get_sp_from_cpustate(env)) == -TARGET_EFAULT) {
-        goto badframe;
-    }
     unlock_user_struct(frame, frame_addr, 0);
     return -TARGET_QEMU_ESIGRETURN;
 
-- 
2.31.1



  parent reply	other threads:[~2021-05-17 18:31 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-17 18:13 [PULL 00/59] Linux user for 6.1 patches Laurent Vivier
2021-05-17 18:13 ` [PULL 01/59] linux-user: Remove dead code Laurent Vivier
2021-05-17 18:13 ` [PULL 02/59] linux-user: strace now handles unshare syscall args correctly Laurent Vivier
2021-05-17 18:13 ` [PULL 03/59] linux-user/arm: Split out emulate_arm_fpa11 Laurent Vivier
2021-05-17 18:13 ` [PULL 04/59] linux-user/arm: Do not emulate fpa11 in thumb mode Laurent Vivier
2021-05-17 18:13 ` [PULL 05/59] linux-user/arm: Do not fill in si_code for fpa11 exceptions Laurent Vivier
2021-05-17 18:13 ` [PULL 06/59] linux-user/arm: Simplify accumulating and raising " Laurent Vivier
2021-05-17 18:13 ` [PULL 07/59] linux-user: Add strace support for printing arguments of llseek Laurent Vivier
2021-05-17 18:13 ` [PULL 08/59] linux-user: Split out target_restore_altstack Laurent Vivier
2021-05-17 18:13 ` Laurent Vivier [this message]
2021-05-17 18:13 ` [PULL 10/59] linux-user: Pass CPUArchState to do_sigaltstack Laurent Vivier
2021-05-17 18:13 ` [PULL 11/59] linux-user: Pass CPUArchState to target_restore_altstack Laurent Vivier
2021-05-17 18:13 ` [PULL 12/59] linux-user/sparc: Include TARGET_STACK_BIAS in get_sp_from_cpustate Laurent Vivier
2021-05-17 18:13 ` [PULL 13/59] linux-user/sparc: Clean up init_thread Laurent Vivier
2021-05-17 18:13 ` [PULL 14/59] linux-user/sparc: Merge sparc64 target_syscall.h Laurent Vivier
2021-05-17 18:13 ` [PULL 15/59] linux-user/sparc: Merge sparc64 target_elf.h Laurent Vivier
2021-05-17 18:13 ` [PULL 16/59] linux-user/sparc: Merge sparc64 target_structs.h Laurent Vivier
2021-05-17 18:13 ` [PULL 17/59] linux-user/sparc: Merge sparc64 termbits.h Laurent Vivier
2021-05-17 18:13 ` [PULL 18/59] linux-user/sparc: Merge sparc64/ into sparc/ Laurent Vivier
2021-05-17 18:13 ` [PULL 19/59] linux-user/sparc: Remove target_sigcontext as unused Laurent Vivier
2021-05-17 18:13 ` [PULL 20/59] linux-user/sparc: Remove target_rt_signal_frame " Laurent Vivier
2021-05-17 18:13 ` [PULL 21/59] linux-user/sparc: Fix the stackframe structure Laurent Vivier
2021-05-17 18:13 ` [PULL 22/59] linux-user/sparc: Use target_pt_regs Laurent Vivier
2021-05-17 18:13 ` [PULL 23/59] linux-user/sparc: Split out save_reg_win Laurent Vivier
2021-05-17 18:13 ` [PULL 24/59] linux-user/sparc: Clean up get_sigframe Laurent Vivier
2021-05-17 18:13 ` [PULL 25/59] linux-user/sparc: Save and restore fpu in signal frame Laurent Vivier
2021-05-17 18:13 ` [PULL 26/59] linux-user/sparc: Add rwin_save to " Laurent Vivier
2021-05-17 18:13 ` [PULL 27/59] linux-user/sparc: Clean up setup_frame Laurent Vivier
2021-05-17 18:13 ` [PULL 28/59] linux-user/sparc: Minor corrections to do_sigreturn Laurent Vivier
2021-05-17 18:13 ` [PULL 29/59] linux-user/sparc: Add 64-bit support to fpu save/restore Laurent Vivier
2021-05-17 18:13 ` [PULL 30/59] linux-user/sparc: Implement sparc32 rt signals Laurent Vivier
2021-05-17 18:13 ` [PULL 31/59] linux-user/sparc: Implement sparc64 " Laurent Vivier
2021-05-17 18:13 ` [PULL 32/59] tests/tcg/sparc64: Re-enable linux-test Laurent Vivier
2021-05-17 18:13 ` [PULL 33/59] linux-user/s390x: Fix sigframe types Laurent Vivier
2021-05-17 18:13 ` [PULL 34/59] linux-user/s390x: Use uint16_t for signal retcode Laurent Vivier
2021-05-17 18:14 ` [PULL 35/59] linux-user/s390x: Remove PSW_ADDR_AMODE Laurent Vivier
2021-05-17 18:14 ` [PULL 36/59] linux-user/s390x: Remove restore_sigregs return value Laurent Vivier
2021-05-17 18:14 ` [PULL 37/59] linux-user/s390x: Fix trace in restore_regs Laurent Vivier
2021-05-17 18:14 ` [PULL 38/59] linux-user/s390x: Fix sigcontext sregs value Laurent Vivier
2021-05-17 18:14 ` [PULL 39/59] linux-user/s390x: Use tswap_sigset in setup_rt_frame Laurent Vivier
2021-05-17 18:14 ` [PULL 40/59] linux-user/s390x: Tidy save_sigregs Laurent Vivier
2021-05-17 18:14 ` [PULL 41/59] linux-user/s390x: Clean up single-use gotos in signal.c Laurent Vivier
2021-05-17 18:14 ` [PULL 42/59] linux-user/s390x: Set psw.mask properly for the signal handler Laurent Vivier
2021-05-17 18:14 ` [PULL 43/59] linux-user/s390x: Add stub sigframe argument for last_break Laurent Vivier
2021-05-17 18:14 ` [PULL 44/59] linux-user/s390x: Fix frame_addr corruption in setup_frame Laurent Vivier
2021-05-17 18:14 ` [PULL 45/59] linux-user/s390x: Add build asserts for sigset sizes Laurent Vivier
2021-05-17 18:14 ` [PULL 46/59] linux-user/s390x: Clean up signal.c Laurent Vivier
2021-05-17 18:14 ` [PULL 47/59] linux-user/s390x: Handle vector regs in signal stack Laurent Vivier
2021-05-17 18:14 ` [PULL 48/59] linux-user: Add copy_file_range to strace.list Laurent Vivier
2021-05-17 18:14 ` [PULL 49/59] linux-user: Fix erroneous conversion in copy_file_range Laurent Vivier
2021-05-17 18:14 ` [PULL 50/59] linux-user: use GDateTime for formatting timestamp for core file Laurent Vivier
2021-05-17 18:14 ` [PULL 51/59] linux-user/alpha: Fix rt sigframe return Laurent Vivier
2021-05-17 18:14 ` [PULL 52/59] linux-user/alpha: Rename the sigaction restorer field Laurent Vivier
2021-05-17 18:14 ` [PULL 53/59] linux-user: Pass ka_restorer to do_sigaction Laurent Vivier
2021-05-17 18:14 ` [PULL 54/59] linux-user: Honor TARGET_ARCH_HAS_SA_RESTORER in do_syscall Laurent Vivier
2021-05-17 18:14 ` [PULL 55/59] linux-user/alpha: Define TARGET_ARCH_HAS_KA_RESTORER Laurent Vivier
2021-05-17 18:14 ` [PULL 56/59] linux-user/alpha: Share code for TARGET_NR_sigaction Laurent Vivier
2021-05-17 18:14 ` [PULL 57/59] linux-user: Tidy TARGET_NR_rt_sigaction Laurent Vivier
2021-05-17 18:14 ` [PULL 58/59] linux-user/elfload: fix filling psinfo->pr_psargs Laurent Vivier
2021-05-17 18:14 ` [PULL 59/59] linux-user/elfload: add s390x core dumping support Laurent Vivier
2021-05-17 19:15 ` [PULL 00/59] Linux user for 6.1 patches no-reply
2021-05-18  5:13   ` Laurent Vivier
2021-05-18  5:30 Laurent Vivier
2021-05-18  5:30 ` [PULL 09/59] linux-user: Use target_restore_altstack in all sigreturn Laurent Vivier

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