From: Bryan Ford Date: Sat, 5 Nov 2005 16:25:54 +0000 (+0100) Subject: [PATCH] x86_64: Save/restore CS in 64bit signal handlers and force __USER_CS for CS X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e4e5d324b9c5586f408a72d1534474c449dd5212;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [PATCH] x86_64: Save/restore CS in 64bit signal handlers and force __USER_CS for CS This allows to run 64bit signal handlers in 64bit processes that run small code snippets in compat mode. Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- diff --git a/arch/x86_64/kernel/signal.c b/arch/x86_64/kernel/signal.c index d642fbf3da29..5876df116c92 100644 --- a/arch/x86_64/kernel/signal.c +++ b/arch/x86_64/kernel/signal.c @@ -110,6 +110,15 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, unsigned COPY(r14); COPY(r15); + /* Kernel saves and restores only the CS segment register on signals, + * which is the bare minimum needed to allow mixed 32/64-bit code. + * App's signal handler can save/restore other segments if needed. */ + { + unsigned cs; + err |= __get_user(cs, &sc->cs); + regs->cs = cs | 3; /* Force into user mode */ + } + { unsigned int tmpflags; err |= __get_user(tmpflags, &sc->eflags); @@ -187,6 +196,7 @@ setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned lo { int err = 0; + err |= __put_user(regs->cs, &sc->cs); err |= __put_user(0, &sc->gs); err |= __put_user(0, &sc->fs); @@ -318,7 +328,14 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, regs->rsp = (unsigned long)frame; + /* Set up the CS register to run signal handlers in 64-bit mode, + even if the handler happens to be interrupting 32-bit code. */ + regs->cs = __USER_CS; + + /* This, by contrast, has nothing to do with segment registers - + see include/asm-x86_64/uaccess.h for details. */ set_fs(USER_DS); + regs->eflags &= ~TF_MASK; if (test_thread_flag(TIF_SINGLESTEP)) ptrace_notify(SIGTRAP);