The following commit has been merged in the linux branch: commit ab72b00734ae4d0b5ff273a0f6c7abeaa3713c76 Author: Russell King rmk+kernel@arm.linux.org.uk Date: Sun Oct 25 15:39:37 2009 +0000
ARM: Fix signal restart issues with NX and OABI compat
The signal restarting code was placed on the user stack when OABI compatibility is enabled. Unfortunately, with an EABI NX executable, this results in an attempt to run code from the non-executable stack, which segfaults the application.
Fix this by placing the code in the vectors page, along side the signal return code, and directing the application to that code.
Reported-by: saeed bishara saeed.bishara@gmail.com Tested-by: saeed bishara saeed.bishara@gmail.com Signed-off-by: Russell King rmk+kernel@arm.linux.org.uk
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c index 1423a34..2a573d4 100644 --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -1,7 +1,7 @@ /* * linux/arch/arm/kernel/signal.c * - * Copyright (C) 1995-2002 Russell King + * Copyright (C) 1995-2009 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -29,6 +29,7 @@ */ #define SWI_SYS_SIGRETURN (0xef000000|(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE)) #define SWI_SYS_RT_SIGRETURN (0xef000000|(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE)) +#define SWI_SYS_RESTART (0xef000000|__NR_restart_syscall|__NR_OABI_SYSCALL_BASE)
/* * With EABI, the syscall number has to be loaded into r7. @@ -49,6 +50,18 @@ const unsigned long sigreturn_codes[7] = { };
/* + * Either we support OABI only, or we have EABI with the OABI + * compat layer enabled. In the later case we don't know if + * user space is EABI or not, and if not we must not clobber r7. + * Always using the OABI syscall solves that issue and works for + * all those cases. + */ +const unsigned long syscall_restart_code[2] = { + SWI_SYS_RESTART, /* swi __NR_restart_syscall */ + 0xe49df004, /* ldr pc, [sp], #4 */ +}; + +/* * atomically swap in the new signal mask, and wait for a signal. */ asmlinkage int sys_sigsuspend(int restart, unsigned long oldmask, old_sigset_t mask) @@ -645,32 +658,12 @@ static void do_signal(struct pt_regs *regs, int syscall) regs->ARM_pc -= 4; #else u32 __user *usp; - u32 swival = __NR_restart_syscall;
- regs->ARM_sp -= 12; + regs->ARM_sp -= 4; usp = (u32 __user *)regs->ARM_sp;
- /* - * Either we supports OABI only, or we have - * EABI with the OABI compat layer enabled. - * In the later case we don't know if user - * space is EABI or not, and if not we must - * not clobber r7. Always using the OABI - * syscall solves that issue and works for - * all those cases. - */ - swival = swival - __NR_SYSCALL_BASE + __NR_OABI_SYSCALL_BASE; - - put_user(regs->ARM_pc, &usp[0]); - /* swi __NR_restart_syscall */ - put_user(0xef000000 | swival, &usp[1]); - /* ldr pc, [sp], #12 */ - put_user(0xe49df00c, &usp[2]); - - flush_icache_range((unsigned long)usp, - (unsigned long)(usp + 3)); - - regs->ARM_pc = regs->ARM_sp + 4; + put_user(regs->ARM_pc, usp); + regs->ARM_pc = KERN_RESTART_CODE; #endif } } diff --git a/arch/arm/kernel/signal.h b/arch/arm/kernel/signal.h index 27beece..6fcfe83 100644 --- a/arch/arm/kernel/signal.h +++ b/arch/arm/kernel/signal.h @@ -1,12 +1,14 @@ /* * linux/arch/arm/kernel/signal.h * - * Copyright (C) 2005 Russell King. + * Copyright (C) 2005-2009 Russell King. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #define KERN_SIGRETURN_CODE (CONFIG_VECTORS_BASE + 0x00000500) +#define KERN_RESTART_CODE (KERN_SIGRETURN_CODE + sizeof(sigreturn_codes))
extern const unsigned long sigreturn_codes[7]; +extern const unsigned long syscall_restart_code[2]; diff --git a/arch/arm/kernel/traps.c b/arch/arm/kernel/traps.c index f838f36..95718a6 100644 --- a/arch/arm/kernel/traps.c +++ b/arch/arm/kernel/traps.c @@ -1,7 +1,7 @@ /* * linux/arch/arm/kernel/traps.c * - * Copyright (C) 1995-2002 Russell King + * Copyright (C) 1995-2009 Russell King * Fragments that appear the same as linux/arch/i386/kernel/traps.c (C) Linus Torvalds * * This program is free software; you can redistribute it and/or modify @@ -751,6 +751,8 @@ void __init early_trap_init(void) */ memcpy((void *)KERN_SIGRETURN_CODE, sigreturn_codes, sizeof(sigreturn_codes)); + memcpy((void *)KERN_RESTART_CODE, syscall_restart_code, + sizeof(syscall_restart_code));
flush_icache_range(vectors, vectors + PAGE_SIZE); modify_domain(DOMAIN_USER, DOMAIN_CLIENT);