forked from luck/tmp_suning_uos_patched
5d920bb929
This implements basic -fstack-protector support, based on the early ARM
version in c743f38013. The SMP case is
limited to the initial canary value, while the UP case handles per-task
granularity (limited to 32-bit sh until a new enough sh64 compiler
manifests itself).
Signed-off-by: Filippo Arcidiacono <filippo.arcidiacono@st.com>
Reviewed-by: Carmelo Amoroso <carmelo.amoroso@st.com>
Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
#include <linux/mm.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/export.h>
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#include <linux/stackprotector.h>
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struct kmem_cache *task_xstate_cachep = NULL;
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unsigned int xstate_size;
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#ifdef CONFIG_CC_STACKPROTECTOR
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unsigned long __stack_chk_guard __read_mostly;
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EXPORT_SYMBOL(__stack_chk_guard);
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#endif
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int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
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{
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*dst = *src;
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if (src->thread.xstate) {
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dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
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GFP_KERNEL);
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if (!dst->thread.xstate)
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return -ENOMEM;
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memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
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}
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return 0;
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}
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void free_thread_xstate(struct task_struct *tsk)
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{
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if (tsk->thread.xstate) {
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kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
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tsk->thread.xstate = NULL;
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}
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}
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#if THREAD_SHIFT < PAGE_SHIFT
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static struct kmem_cache *thread_info_cache;
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struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node)
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{
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struct thread_info *ti;
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#ifdef CONFIG_DEBUG_STACK_USAGE
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gfp_t mask = GFP_KERNEL | __GFP_ZERO;
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#else
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gfp_t mask = GFP_KERNEL;
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#endif
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ti = kmem_cache_alloc_node(thread_info_cache, mask, node);
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return ti;
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}
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void free_thread_info(struct thread_info *ti)
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{
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free_thread_xstate(ti->task);
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kmem_cache_free(thread_info_cache, ti);
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}
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void thread_info_cache_init(void)
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{
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thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
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THREAD_SIZE, SLAB_PANIC, NULL);
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}
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#else
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struct thread_info *alloc_thread_info_node(struct task_struct *tsk, int node)
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{
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#ifdef CONFIG_DEBUG_STACK_USAGE
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gfp_t mask = GFP_KERNEL | __GFP_ZERO;
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#else
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gfp_t mask = GFP_KERNEL;
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#endif
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struct page *page = alloc_pages_node(node, mask, THREAD_SIZE_ORDER);
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return page ? page_address(page) : NULL;
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}
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void free_thread_info(struct thread_info *ti)
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{
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free_thread_xstate(ti->task);
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free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
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}
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#endif /* THREAD_SHIFT < PAGE_SHIFT */
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void arch_task_cache_init(void)
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{
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if (!xstate_size)
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return;
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task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
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__alignof__(union thread_xstate),
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SLAB_PANIC | SLAB_NOTRACK, NULL);
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}
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#ifdef CONFIG_SH_FPU_EMU
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# define HAVE_SOFTFP 1
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#else
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# define HAVE_SOFTFP 0
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#endif
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void __cpuinit init_thread_xstate(void)
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{
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if (boot_cpu_data.flags & CPU_HAS_FPU)
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xstate_size = sizeof(struct sh_fpu_hard_struct);
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else if (HAVE_SOFTFP)
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xstate_size = sizeof(struct sh_fpu_soft_struct);
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else
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xstate_size = 0;
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}
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