lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Wed, 23 Feb 2022 22:04:32 -0800 From: Kees Cook <keescook@...omium.org> To: Thomas Bogendoerfer <tsbogend@...ha.franken.de> Cc: Kees Cook <keescook@...omium.org>, Marc Zyngier <maz@...nel.org>, Guenter Roeck <linux@...ck-us.net>, Mark Rutland <mark.rutland@....com>, Yanteng Si <siyanteng01@...il.com>, linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH] mips: Implement "current_stack_pointer" To follow the existing per-arch conventions replace open-coded uses of asm "sp" as "current_stack_pointer". This will let it be used in non-arch places (like HARDENED_USERCOPY). Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de> Cc: Marc Zyngier <maz@...nel.org> Cc: Guenter Roeck <linux@...ck-us.net> Cc: Mark Rutland <mark.rutland@....com> Cc: Yanteng Si <siyanteng01@...il.com> Cc: linux-mips@...r.kernel.org Signed-off-by: Kees Cook <keescook@...omium.org> --- arch/mips/Kconfig | 1 + arch/mips/include/asm/thread_info.h | 2 ++ arch/mips/kernel/irq.c | 3 +-- arch/mips/lib/uncached.c | 4 +--- 4 files changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 058446f01487..6781f87e2218 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -4,6 +4,7 @@ config MIPS default y select ARCH_32BIT_OFF_T if !64BIT select ARCH_BINFMT_ELF_STATE if MIPS_FP_SUPPORT + select ARCH_HAS_CURRENT_STACK_POINTER select ARCH_HAS_DEBUG_VIRTUAL if !64BIT select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_KCOV diff --git a/arch/mips/include/asm/thread_info.h b/arch/mips/include/asm/thread_info.h index 0b17aaa9e012..4463348d2372 100644 --- a/arch/mips/include/asm/thread_info.h +++ b/arch/mips/include/asm/thread_info.h @@ -69,6 +69,8 @@ static inline struct thread_info *current_thread_info(void) return __current_thread_info; } +register unsigned long current_stack_pointer __asm__("sp"); + #endif /* !__ASSEMBLY__ */ /* thread information allocation */ diff --git a/arch/mips/kernel/irq.c b/arch/mips/kernel/irq.c index 5e11582fe308..fc313c49a417 100644 --- a/arch/mips/kernel/irq.c +++ b/arch/mips/kernel/irq.c @@ -75,9 +75,8 @@ void __init init_IRQ(void) #ifdef CONFIG_DEBUG_STACKOVERFLOW static inline void check_stack_overflow(void) { - unsigned long sp; + unsigned long sp = current_stack_pointer; - __asm__ __volatile__("move %0, $sp" : "=r" (sp)); sp &= THREAD_MASK; /* diff --git a/arch/mips/lib/uncached.c b/arch/mips/lib/uncached.c index f80a67c092b6..f8d4ca046c3e 100644 --- a/arch/mips/lib/uncached.c +++ b/arch/mips/lib/uncached.c @@ -40,9 +40,7 @@ unsigned long run_uncached(void *func) register long ret __asm__("$2"); long lfunc = (long)func, ufunc; long usp; - long sp; - - __asm__("move %0, $sp" : "=r" (sp)); + long sp = current_stack_pointer; if (sp >= (long)CKSEG0 && sp < (long)CKSEG2) usp = CKSEG1ADDR(sp); -- 2.30.2
Powered by blists - more mailing lists