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[PATCH v3 18/27] linux-user/nios2: Fixes for signal frame setup
From: |
Richard Henderson |
Subject: |
[PATCH v3 18/27] linux-user/nios2: Fixes for signal frame setup |
Date: |
Fri, 24 Sep 2021 12:59:17 -0400 |
Do not confuse host and guest addresses. Lock and unlock
the target_rt_sigframe structure in setup_rt_sigframe.
Since rt_setup_ucontext always returns 0, drop the return
value entirely. This eliminates the only write to the err
variable in setup_rt_sigframe.
Always copy the siginfo structure.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
linux-user/nios2/signal.c | 49 ++++++++++++++++-----------------------
1 file changed, 20 insertions(+), 29 deletions(-)
diff --git a/linux-user/nios2/signal.c b/linux-user/nios2/signal.c
index c9a235ded5..95f6d737e1 100644
--- a/linux-user/nios2/signal.c
+++ b/linux-user/nios2/signal.c
@@ -42,7 +42,7 @@ struct target_rt_sigframe {
struct target_ucontext uc;
};
-static int rt_setup_ucontext(struct target_ucontext *uc, CPUNios2State *env)
+static void rt_setup_ucontext(struct target_ucontext *uc, CPUNios2State *env)
{
unsigned long *gregs = uc->tuc_mcontext.gregs;
@@ -75,8 +75,6 @@ static int rt_setup_ucontext(struct target_ucontext *uc,
CPUNios2State *env)
__put_user(env->regs[R_GP], &gregs[25]);
__put_user(env->regs[R_EA], &gregs[27]);
__put_user(env->regs[R_SP], &gregs[28]);
-
- return 0;
}
static int rt_restore_ucontext(CPUNios2State *env, struct target_ucontext *uc,
@@ -135,8 +133,8 @@ static int rt_restore_ucontext(CPUNios2State *env, struct
target_ucontext *uc,
return 0;
}
-static void *get_sigframe(struct target_sigaction *ka, CPUNios2State *env,
- size_t frame_size)
+static abi_ptr get_sigframe(struct target_sigaction *ka, CPUNios2State *env,
+ size_t frame_size)
{
unsigned long usp;
@@ -144,7 +142,7 @@ static void *get_sigframe(struct target_sigaction *ka,
CPUNios2State *env,
usp = target_sigsp(get_sp_from_cpustate(env), ka);
/* Verify, is it 32 or 64 bit aligned */
- return (void *)((usp - frame_size) & -8UL);
+ return (usp - frame_size) & -8;
}
void setup_rt_frame(int sig, struct target_sigaction *ka,
@@ -153,26 +151,25 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
CPUNios2State *env)
{
struct target_rt_sigframe *frame;
- int i, err = 0;
+ abi_ptr frame_addr;
+ int i;
- frame = get_sigframe(ka, env, sizeof(*frame));
-
- if (ka->sa_flags & SA_SIGINFO) {
- tswap_siginfo(&frame->info, info);
+ frame_addr = get_sigframe(ka, env, sizeof(*frame));
+ if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
+ force_sigsegv(sig);
+ return;
}
+ tswap_siginfo(&frame->info, info);
+
/* Create the ucontext. */
__put_user(0, &frame->uc.tuc_flags);
__put_user(0, &frame->uc.tuc_link);
target_save_altstack(&frame->uc.tuc_stack, env);
- err |= rt_setup_ucontext(&frame->uc, env);
+ rt_setup_ucontext(&frame->uc, env);
for (i = 0; i < TARGET_NSIG_WORDS; i++) {
__put_user((abi_ulong)set->sig[i],
- (abi_ulong *)&frame->uc.tuc_sigmask.sig[i]);
- }
-
- if (err) {
- goto give_sigsegv;
+ (abi_ulong *)&frame->uc.tuc_sigmask.sig[i]);
}
/* Set up to return from userspace; jump to fixed address sigreturn
@@ -180,19 +177,13 @@ void setup_rt_frame(int sig, struct target_sigaction *ka,
env->regs[R_RA] = default_rt_sigreturn;
/* Set up registers for signal handler */
- env->regs[R_SP] = (unsigned long) frame;
- env->regs[4] = (unsigned long) sig;
- env->regs[5] = (unsigned long) &frame->info;
- env->regs[6] = (unsigned long) &frame->uc;
- env->regs[R_EA] = (unsigned long) ka->_sa_handler;
- return;
+ env->regs[R_SP] = frame_addr;
+ env->regs[4] = sig;
+ env->regs[5] = frame_addr + offsetof(struct target_rt_sigframe, info);
+ env->regs[6] = frame_addr + offsetof(struct target_rt_sigframe, uc);
+ env->regs[R_EA] = ka->_sa_handler;
-give_sigsegv:
- if (sig == TARGET_SIGSEGV) {
- ka->_sa_handler = TARGET_SIG_DFL;
- }
- force_sigsegv(sig);
- return;
+ unlock_user_struct(frame, frame_addr, 1);
}
long do_sigreturn(CPUNios2State *env)
--
2.25.1
- [PATCH v3 11/27] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set, (continued)
- [PATCH v3 11/27] linux-user/x86_64: Raise SIGSEGV if SA_RESTORER not set, Richard Henderson, 2021/09/24
- [PATCH v3 09/27] linux-user/hppa: Document non-use of setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 10/27] linux-user/i386: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 16/27] linux-user/nios2: Properly emulate EXCP_TRAP, Richard Henderson, 2021/09/24
- [PATCH v3 15/27] linux-user/mips: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 12/27] linux-user/m68k: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 14/27] linux-user/mips: Tidy install_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 18/27] linux-user/nios2: Fixes for signal frame setup,
Richard Henderson <=
- [PATCH v3 20/27] linux-user/ppc: Simplify encode_trampoline, Richard Henderson, 2021/09/24
- [PATCH v3 19/27] linux-user/openrisc: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 21/27] linux-user/ppc: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 27/27] linux-user: Remove default for TARGET_ARCH_HAS_SIGTRAMP_PAGE, Richard Henderson, 2021/09/24
- [PATCH v3 23/27] linux-user/s390x: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 22/27] linux-user/riscv: Implement setup_sigtramp, Richard Henderson, 2021/09/24
- [PATCH v3 24/27] linux-user/sh4: Implement setup_sigtramp, Richard Henderson, 2021/09/24