From dea6b3a66de33566a79999db8c9738abdb01471e Mon Sep 17 00:00:00 2001 From: Amanieu d'Antras Date: Thu, 2 Jan 2020 18:24:08 +0100 Subject: [PATCH] UPSTREAM: arm64: Implement copy_thread_tls commit a4376f2fbcc8084832f2f114577c8d68234c7903 upstream. This is required for clone3 which passes the TLS value through a struct rather than a register. Change-Id: I71e8124905e5ffc574ef6e01aeb23a8dd9bd8f1d Signed-off-by: Amanieu d'Antras Cc: linux-arm-kernel@lists.infradead.org Cc: # 5.3.x Acked-by: Will Deacon Link: https://lore.kernel.org/r/20200102172413.654385-3-amanieu@gmail.com Signed-off-by: Christian Brauner Signed-off-by: Greg Kroah-Hartman --- arch/arm64/Kconfig | 1 + arch/arm64/kernel/process.c | 10 +++++----- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index d83030b641a2..479ca09d9f61 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -133,6 +133,7 @@ config ARM64 select HAVE_CMPXCHG_DOUBLE select HAVE_CMPXCHG_LOCAL select HAVE_CONTEXT_TRACKING + select HAVE_COPY_THREAD_TLS select HAVE_DEBUG_BUGVERBOSE select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index b80edc1ce775..cff8814ff0a5 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -394,8 +394,8 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) asmlinkage void ret_from_fork(void) asm("ret_from_fork"); -int copy_thread(unsigned long clone_flags, unsigned long stack_start, - unsigned long stk_sz, struct task_struct *p) +int copy_thread_tls(unsigned long clone_flags, unsigned long stack_start, + unsigned long stk_sz, struct task_struct *p, unsigned long tls) { struct pt_regs *childregs = task_pt_regs(p); @@ -428,11 +428,11 @@ int copy_thread(unsigned long clone_flags, unsigned long stack_start, } /* - * If a TLS pointer was passed to clone (4th argument), use it - * for the new thread. + * If a TLS pointer was passed to clone, use it for the new + * thread. */ if (clone_flags & CLONE_SETTLS) - p->thread.uw.tp_value = childregs->regs[3]; + p->thread.uw.tp_value = tls; } else { memset(childregs, 0, sizeof(struct pt_regs)); childregs->pstate = PSR_MODE_EL1h;