This is a note to let you know that I've just added the patch titled arm64: ptrace: fix compat hardware watchpoint reporting to the 3.16-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm64-ptrace-fix-compat-hardware-watchpoint-reporting.patch and it can be found in the queue-3.16 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 27d7ff273c2aad37b28f6ff0cab2cfa35b51e648 Mon Sep 17 00:00:00 2001 From: Will Deacon <will.deacon@xxxxxxx> Date: Fri, 22 Aug 2014 14:13:24 +0100 Subject: arm64: ptrace: fix compat hardware watchpoint reporting From: Will Deacon <will.deacon@xxxxxxx> commit 27d7ff273c2aad37b28f6ff0cab2cfa35b51e648 upstream. I'm not sure what I was on when I wrote this, but when iterating over the hardware watchpoint array (hbp_watch_array), our index is off by ARM_MAX_BRP, so we walk off the end of our thread_struct... ... except, a dodgy condition in the loop means that it never executes at all (bp cannot be NULL). This patch fixes the code so that we remove the bp check and use the correct index for accessing the watchpoint structures. Signed-off-by: Will Deacon <will.deacon@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm64/include/asm/hw_breakpoint.h | 1 - arch/arm64/kernel/ptrace.c | 3 ++- 2 files changed, 2 insertions(+), 2 deletions(-) --- a/arch/arm64/include/asm/hw_breakpoint.h +++ b/arch/arm64/include/asm/hw_breakpoint.h @@ -79,7 +79,6 @@ static inline void decode_ctrl_reg(u32 r */ #define ARM_MAX_BRP 16 #define ARM_MAX_WRP 16 -#define ARM_MAX_HBP_SLOTS (ARM_MAX_BRP + ARM_MAX_WRP) /* Virtual debug register bases. */ #define AARCH64_DBG_REG_BVR 0 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -85,7 +85,8 @@ static void ptrace_hbptriggered(struct p break; } } - for (i = ARM_MAX_BRP; i < ARM_MAX_HBP_SLOTS && !bp; ++i) { + + for (i = 0; i < ARM_MAX_WRP; ++i) { if (current->thread.debug.hbp_watch[i] == bp) { info.si_errno = -((i << 1) + 1); break; Patches currently in stable-queue which might be from will.deacon@xxxxxxx are queue-3.16/arm64-ptrace-fix-compat-hardware-watchpoint-reporting.patch queue-3.16/arm64-use-irq_set_affinity-with-force-false-when-migrating-irqs.patch queue-3.16/arm64-flush-tls-registers-during-exec.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html