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| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2019-12-21 08:32:30 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-01-27 22:36:15 +1100 |
| commit | 547db12fd8a0ce753c6bafd130827f1755c93fe6 (patch) | |
| tree | cea3f0575eab94ad1aa0dc186f23585f1786e370 | |
| parent | powerpc/32: Add early stack overflow detection with VMAP stack. (diff) | |
| download | linux-dev-547db12fd8a0ce753c6bafd130827f1755c93fe6.tar.xz linux-dev-547db12fd8a0ce753c6bafd130827f1755c93fe6.zip | |
powerpc/32: Use vmapped stacks for interrupts
In order to also catch overflows on IRQ stacks, use vmapped stacks.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d33ad1b36ddff4dcc19f96c592c12a61cf85d406.1576916812.git.christophe.leroy@c-s.fr
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/kernel/irq.c | 22 | ||||
| -rw-r--r-- | arch/powerpc/kernel/setup_32.c | 3 |
2 files changed, 25 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c index add67498c126..5c9b11878555 100644 --- a/arch/powerpc/kernel/irq.c +++ b/arch/powerpc/kernel/irq.c @@ -50,6 +50,7 @@ #include <linux/debugfs.h> #include <linux/of.h> #include <linux/of_irq.h> +#include <linux/vmalloc.h> #include <linux/uaccess.h> #include <asm/io.h> @@ -664,8 +665,29 @@ void do_IRQ(struct pt_regs *regs) set_irq_regs(old_regs); } +static void *__init alloc_vm_stack(void) +{ + return __vmalloc_node_range(THREAD_SIZE, THREAD_ALIGN, VMALLOC_START, + VMALLOC_END, THREADINFO_GFP, PAGE_KERNEL, + 0, NUMA_NO_NODE, (void*)_RET_IP_); +} + +static void __init vmap_irqstack_init(void) +{ + int i; + + for_each_possible_cpu(i) { + softirq_ctx[i] = alloc_vm_stack(); + hardirq_ctx[i] = alloc_vm_stack(); + } +} + + void __init init_IRQ(void) { + if (IS_ENABLED(CONFIG_VMAP_STACK)) + vmap_irqstack_init(); + if (ppc_md.init_IRQ) ppc_md.init_IRQ(); } diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c index a55b4d9ab824..5b49b26eb154 100644 --- a/arch/powerpc/kernel/setup_32.c +++ b/arch/powerpc/kernel/setup_32.c @@ -153,6 +153,9 @@ void __init irqstack_early_init(void) { unsigned int i; + if (IS_ENABLED(CONFIG_VMAP_STACK)) + return; + /* interrupt stacks must be in lowmem, we get that for free on ppc32 * as the memblock is limited to lowmem by default */ for_each_possible_cpu(i) { |