[PATCH 5.11 281/306] powerpc: Fix inverted SET_FULL_REGS bitop
From: gregkh@linuxfoundation.org
Date: 2021-03-15 14:46:05
Also in:
lkml
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
From: Nicholas Piggin <npiggin@gmail.com>
commit 73ac79881804eed2e9d76ecdd1018037f8510cb1 upstream.
This bit operation was inverted and set the low bit rather than
cleared it, breaking the ability to ptrace non-volatile GPRs after
exec. Fix.
Only affects 64e and 32-bit.
Fixes: feb9df3462e6 ("powerpc/64s: Always has full regs, so remove remnant checks")
Cc: stable@vger.kernel.org # v5.8+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210308085530.3191843-1-npiggin@gmail.com (local)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/powerpc/include/asm/ptrace.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/arch/powerpc/include/asm/ptrace.h
+++ b/arch/powerpc/include/asm/ptrace.h@@ -195,7 +195,7 @@ static inline void regs_set_return_value #define TRAP_FLAGS_MASK 0x11 #define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK) #define FULL_REGS(regs) (((regs)->trap & 1) == 0) -#define SET_FULL_REGS(regs) ((regs)->trap |= 1) +#define SET_FULL_REGS(regs) ((regs)->trap &= ~1) #endif #define CHECK_FULL_REGS(regs) BUG_ON(!FULL_REGS(regs)) #define NV_REG_POISON 0xdeadbeefdeadbeefUL
@@ -210,7 +210,7 @@ static inline void regs_set_return_value #define TRAP_FLAGS_MASK 0x1F #define TRAP(regs) ((regs)->trap & ~TRAP_FLAGS_MASK) #define FULL_REGS(regs) (((regs)->trap & 1) == 0) -#define SET_FULL_REGS(regs) ((regs)->trap |= 1) +#define SET_FULL_REGS(regs) ((regs)->trap &= ~1) #define IS_CRITICAL_EXC(regs) (((regs)->trap & 2) != 0) #define IS_MCHECK_EXC(regs) (((regs)->trap & 4) != 0) #define IS_DEBUG_EXC(regs) (((regs)->trap & 8) != 0)