powerpc/32: Add early stack overflow detection with VMAP stack.
To avoid recursive faults, stack overflow detection has to be performed before writing in the stack in exception prologs. Do it by checking the alignment. If the stack pointer alignment is wrong, it means it is pointing to the following or preceding page. Without VMAP stack, a stack overflow is catastrophic. With VMAP stack, a stack overflow isn't destructive, so don't panic. Kill the task with SIGSEGV instead. A dedicated overflow stack is set up for each CPU. lkdtm: Performing direct entry EXHAUST_STACK lkdtm: Calling function with 512 frame size to depth 32 ... lkdtm: loop 32/32 ... lkdtm: loop 31/32 ... lkdtm: loop 30/32 ... lkdtm: loop 29/32 ... lkdtm: loop 28/32 ... lkdtm: loop 27/32 ... lkdtm: loop 26/32 ... lkdtm: loop 25/32 ... lkdtm: loop 24/32 ... lkdtm: loop 23/32 ... lkdtm: loop 22/32 ... lkdtm: loop 21/32 ... lkdtm: loop 20/32 ... Kernel stack overflow in process test[359], r1=c900c008 Oops: Kernel stack overflow, sig: 6 [#1] BE PAGE_SIZE=4K MMU=Hash PowerMac Modules linked in: CPU: 0 PID: 359 Comm: test Not tainted 5.3.0-rc7+ #2225 NIP: c0622060 LR: c0626710 CTR: 00000000 REGS: c0895f48 TRAP: 0000 Not tainted (5.3.0-rc7+) MSR: 00001032 <ME,IR,DR,RI> CR: 28004224 XER: 00000000 GPR00: c0626ca4 c900c008 c783c000 c07335cc c900c010 c07335cc c900c0f0 c07335cc GPR08: c900c0f0 00000001 00000000 00000000 28008222 00000000 00000000 00000000 GPR16: 00000000 00000000 10010128 10010000 b799c245 10010158 c07335cc 00000025 GPR24: c0690000 c08b91d4 c068f688 00000020 c900c0f0 c068f668 c08b95b4 c08b91d4 NIP [c0622060] format_decode+0x0/0x4d4 LR [c0626710] vsnprintf+0x80/0x5fc Call Trace: [c900c068] [c0626ca4] vscnprintf+0x18/0x48 [c900c078] [c007b944] vprintk_store+0x40/0x214 [c900c0b8] [c007bf50] vprintk_emit+0x90/0x1dc [c900c0e8] [c007c5cc] printk+0x50/0x60 [c900c128] [c03da5b0] recursive_loop+0x44/0x6c [c900c338] [c03da5c4] recursive_loop+0x58/0x6c [c900c548] [c03da5c4] recursive_loop+0x58/0x6c [c900c758] [c03da5c4] recursive_loop+0x58/0x6c [c900c968] [c03da5c4] recursive_loop+0x58/0x6c [c900cb78] [c03da5c4] recursive_loop+0x58/0x6c [c900cd88] [c03da5c4] recursive_loop+0x58/0x6c [c900cf98] [c03da5c4] recursive_loop+0x58/0x6c [c900d1a8] [c03da5c4] recursive_loop+0x58/0x6c [c900d3b8] [c03da5c4] recursive_loop+0x58/0x6c [c900d5c8] [c03da5c4] recursive_loop+0x58/0x6c [c900d7d8] [c03da5c4] recursive_loop+0x58/0x6c [c900d9e8] [c03da5c4] recursive_loop+0x58/0x6c [c900dbf8] [c03da5c4] recursive_loop+0x58/0x6c [c900de08] [c03da67c] lkdtm_EXHAUST_STACK+0x30/0x4c [c900de18] [c03da3e8] direct_entry+0xc8/0x140 [c900de48] [c029fb40] full_proxy_write+0x64/0xcc [c900de68] [c01500f8] __vfs_write+0x30/0x1d0 [c900dee8] [c0152cb8] vfs_write+0xb8/0x1d4 [c900df08] [c0152f7c] ksys_write+0x58/0xe8 [c900df38] [c0014208] ret_from_syscall+0x0/0x34 --- interrupt: c01 at 0xf806664 LR = 0x1000c868 Instruction dump: 4bffff91 80010014 7c832378 7c0803a6 38210010 4e800020 3d20c08a 3ca0c089 8089a0cc 38a58f0c 38600001 4ba2d494 <9421ffe0> 7c0802a6 bfc10018 7c9f2378 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/1b89c121b4070c7ee99e4f22cc178f15a736b07b.1576916812.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy
Michael Ellerman
Родитель
63289e7d3a
Коммит
3978eb7851
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@ -182,9 +182,11 @@ transfer_to_handler:
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*/
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kuap_save_and_lock r11, r12, r9, r2, r0
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addi r2, r12, -THREAD
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#ifndef CONFIG_VMAP_STACK
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lwz r9,KSP_LIMIT(r12)
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cmplw r1,r9 /* if r1 <= ksp_limit */
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ble- stack_ovf /* then the kernel stack overflowed */
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#endif
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5:
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#if defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_E500)
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lwz r12,TI_LOCAL_FLAGS(r2)
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@ -289,6 +291,7 @@ reenable_mmu:
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b fast_exception_return
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#endif
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#ifndef CONFIG_VMAP_STACK
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/*
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* On kernel stack overflow, load up an initial stack pointer
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* and call StackOverflow(regs), which should not return.
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@ -314,6 +317,7 @@ stack_ovf:
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mtspr SPRN_SRR1,r10
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SYNC
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RFI
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#endif
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#ifdef CONFIG_TRACE_IRQFLAGS
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trace_syscall_entry_irq_off:
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@ -55,6 +55,10 @@
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addi r11, r11, THREAD_SIZE - INT_FRAME_SIZE
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tophys_novmstack r11, r11
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1:
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#ifdef CONFIG_VMAP_STACK
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mtcrf 0x7f, r11
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bt 32 - THREAD_ALIGN_SHIFT, stack_overflow
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#endif
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.endm
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.macro EXCEPTION_PROLOG_2 handle_dar_dsisr=0
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@ -299,4 +303,28 @@ label:
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EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, transfer_to_handler, \
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ret_from_except)
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.macro vmap_stack_overflow_exception
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#ifdef CONFIG_VMAP_STACK
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#ifdef CONFIG_SMP
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mfspr r11, SPRN_SPRG_THREAD
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tovirt(r11, r11)
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lwz r11, TASK_CPU - THREAD(r11)
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slwi r11, r11, 3
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addis r11, r11, emergency_ctx@ha
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#else
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lis r11, emergency_ctx@ha
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#endif
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lwz r11, emergency_ctx@l(r11)
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cmpwi cr1, r11, 0
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bne cr1, 1f
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lis r11, init_thread_union@ha
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addi r11, r11, init_thread_union@l
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1: addi r11, r11, THREAD_SIZE - INT_FRAME_SIZE
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EXCEPTION_PROLOG_2
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SAVE_NVGPRS(r11)
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addi r3, r1, STACK_FRAME_OVERHEAD
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EXC_XFER_STD(0, stack_overflow_exception)
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#endif
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.endm
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#endif /* __HEAD_32_H__ */
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@ -35,7 +35,7 @@ void exc_lvl_early_init(void);
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static inline void exc_lvl_early_init(void) { };
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#endif
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#ifdef CONFIG_PPC64
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#if defined(CONFIG_PPC64) || defined(CONFIG_VMAP_STACK)
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void emergency_stack_init(void);
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#else
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static inline void emergency_stack_init(void) { };
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@ -161,6 +161,18 @@ void __init irqstack_early_init(void)
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}
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}
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#ifdef CONFIG_VMAP_STACK
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void *emergency_ctx[NR_CPUS] __ro_after_init;
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void __init emergency_stack_init(void)
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{
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unsigned int i;
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for_each_possible_cpu(i)
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emergency_ctx[i] = alloc_stack();
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}
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#endif
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#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
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void __init exc_lvl_early_init(void)
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{
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@ -1637,6 +1637,15 @@ void StackOverflow(struct pt_regs *regs)
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panic("kernel stack overflow");
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}
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void stack_overflow_exception(struct pt_regs *regs)
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{
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enum ctx_state prev_state = exception_enter();
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die("Kernel stack overflow", regs, SIGSEGV);
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exception_exit(prev_state);
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}
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void kernel_fp_unavailable_exception(struct pt_regs *regs)
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{
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enum ctx_state prev_state = exception_enter();
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