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fork: allow arch-override of VMAP stack alignment
In some cases, an architecture might wish its stacks to be aligned to a boundary larger than THREAD_SIZE. For example, using an alignment of double THREAD_SIZE can allow for stack overflows smaller than THREAD_SIZE to be detected by checking a single bit of the stack pointer. This patch allows architectures to override the alignment of VMAP'd stacks, by defining THREAD_ALIGN. Where not defined, this defaults to THREAD_SIZE, as is the case today. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Tested-by: Laura Abbott <labbott@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: James Morse <james.morse@arm.com> Cc: linux-kernel@vger.kernel.org
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@ -38,6 +38,10 @@ enum {
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#ifdef __KERNEL__
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#ifndef THREAD_ALIGN
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#define THREAD_ALIGN THREAD_SIZE
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#endif
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#ifdef CONFIG_DEBUG_STACK_USAGE
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# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
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__GFP_ZERO)
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@ -88,6 +88,7 @@
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#include <linux/sysctl.h>
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#include <linux/kcov.h>
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#include <linux/livepatch.h>
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#include <linux/thread_info.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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@ -217,7 +218,7 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
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return s->addr;
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}
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stack = __vmalloc_node_range(THREAD_SIZE, THREAD_SIZE,
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stack = __vmalloc_node_range(THREAD_SIZE, THREAD_ALIGN,
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VMALLOC_START, VMALLOC_END,
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THREADINFO_GFP,
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PAGE_KERNEL,
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