[PATCH 0/5] ARM: add vmap'ed stack support

[Ard Biesheuvel]

On Fri, 8 Oct 2021 at 09:41, Ard Biesheuvel <ardb at kernel.org> wrote:
>
> This series enables support on ARM for vmap'ed task and IRQ stacks in
> the kernel. This is an important hardening feature that terminates tasks
> on inadvertent or deliberate accesses past the stack pointer, which
> might otherwise go completely unnoticed.
>

Forgot to include the sample output from lkdtm exhausting the stack.
The below is a Thumb2 build, which does not support the frame pointer
unwinder, so it is using the ARM unwinder to unwind the overflown
stack.

/ # echo EXHAUST_STACK >/sys/kernel/debug/provoke-crash/DIRECT
lkdtm: Performing direct entry EXHAUST_STACK
lkdtm: Calling function with 512 frame size to depth 32 ...
Insufficient stack space to handle exception!
Task stack:     [0xe9c08000..0xe9c0a000]
IRQ stack:      [0xe0802000..0xe0804000]
Overflow stack: [0xdbbc7500..0xdbbc8500]
Internal error: kernel stack overflow: 0 [#1] SMP THUMB2
Modules linked in:
CPU: 0 PID: 120 Comm: sh Not tainted 5.15.0-rc1+ #991
Hardware name: Generic DT based system
PC is at mmioset+0x16/0xa0
LR is at recursive_loop+0x21/0x50
pc : [<c070d0f6>]    lr : [<c091ae9d>]    psr: 20000033
sp : e9c07f40  ip : e9c07f44  fp : 000e3460
r10: 00000004  r9 : c0fb6770  r8 : c4186000
r7 : e9c09f78  r6 : c2142300  r5 : e9c07f44  r4 : 00000012
r3 : 12121212  r2 : 00000200  r1 : 12121212  r0 : e9c07f44
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA Thumb  Segment user
Control: 70c5387d  Table: 441dd600  DAC: fffffffd
Register r0 information: 2-page vmalloc region starting at 0xe9c08000
allocated at kernel_clone+0x41/0x2d8
Register r1 information: non-paged memory
Register r2 information: non-paged memory
Register r3 information: non-paged memory
Register r4 information: non-paged memory
Register r5 information: 2-page vmalloc region starting at 0xe9c08000
allocated at kernel_clone+0x41/0x2d8
Register r6 information: slab task_struct start c2142300 pointer offset 0
Register r7 information: 2-page vmalloc region starting at 0xe9c08000
allocated at kernel_clone+0x41/0x2d8
Register r8 information: non-slab/vmalloc memory
Register r9 information: non-slab/vmalloc memory
Register r10 information: non-paged memory
Register r11 information: non-paged memory
Register r12 information: 2-page vmalloc region starting at 0xe9c08000
allocated at kernel_clone+0x41/0x2d8
Process sh (pid: 120, stack limit = 0x(ptrval))
Stack: (0xe9c07f40 to 0xe9c0a000)
7f40: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
7f60: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
7f80: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
7fa0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
7fc0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
7fe0: ???????? ???????? ???????? ???????? ???????? ???????? ???????? ????????
8000: 57ac6e9d 00000000 00000000 00000000 00000000 00000000 00000000 00000000
8020: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
8040: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
8060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
8080: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
80a0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
80c0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
80e0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
8100: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
8120: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
8140: 00000000 47ece8b1 00000013 e9c0815c c2142300 c091aec3 00000000 13131313
8160: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313
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8240: 13131313 13131313 13131313 13131313 13131313 13131313 13131313 13131313
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8560: 14141414 14141414 14141414 14141414 14141414 47ece8b1 00000015 e9c0858c
8580: c2142300 c091aec3 00000000 15151515 15151515 15151515 15151515 15151515
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89a0: 16161616 47ece8b1 00000017 e9c089bc c2142300 c091aec3 00000000 17171717
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8dc0: 18181818 18181818 18181818 18181818 18181818 47ece8b1 00000019 e9c08dec
8de0: c2142300 c091aec3 00000000 19191919 19191919 19191919 19191919 19191919
8e00: 19191919 19191919 19191919 19191919 19191919 19191919 19191919 19191919
8e20: 19191919 19191919 19191919 19191919 19191919 19191919 19191919 19191919
8e40: 19191919 19191919 19191919 19191919 19191919 19191919 19191919 19191919
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8e80: 19191919 19191919 19191919 19191919 19191919 19191919 19191919 19191919
8ea0: 19191919 19191919 19191919 19191919 19191919 19191919 19191919 19191919
8ec0: 19191919 19191919 19191919 19191919 19191919 19191919 19191919 19191919
8ee0: 19191919 19191919 19191919 19191919 19191919 19191919 19191919 19191919
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8fc0: 19191919 19191919 19191919 19191919 19191919 19191919 19191919 19191919
8fe0: 19191919 19191919 19191919 47ece8b1 0000001a e9c09004 c2142300 c091aec3
9000: 00000000 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a
9020: 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a
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9120: 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a
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9160: 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a
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91c0: 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a 1a1a1a1a
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9200: 1a1a1a1a 47ece8b1 0000001b e9c0921c c2142300 c091aec3 00000000 1b1b1b1b
9220: 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b
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92c0: 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b
92e0: 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b
9300: 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b
9320: 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b
9340: 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b
9360: 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b
9380: 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b
93a0: 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b
93c0: 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b
93e0: 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b 1b1b1b1b
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9420: 0000001c e9c09434 c2142300 c091aec3 00000000 1c1c1c1c 1c1c1c1c 1c1c1c1c
9440: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
9460: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
9480: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
94a0: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
94c0: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
94e0: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
9500: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
9520: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
9540: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
9560: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
9580: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
95a0: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
95c0: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
95e0: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
9600: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c
9620: 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 1c1c1c1c 47ece8b1 0000001d e9c0964c
9640: c2142300 c091aec3 00000000 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
9660: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
9680: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
96a0: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
96c0: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
96e0: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
9700: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
9720: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
9740: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
9760: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
9780: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
97a0: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
97c0: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
97e0: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
9800: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
9820: 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d 1d1d1d1d
9840: 1d1d1d1d 1d1d1d1d 1d1d1d1d 47ece8b1 0000001e e9c09864 c2142300 c091aec3
9860: 00000000 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
9880: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
98a0: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
98c0: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
98e0: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
9900: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
9920: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
9940: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
9960: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
9980: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
99a0: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
99c0: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
99e0: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
9a00: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
9a20: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
9a40: 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e 1e1e1e1e
9a60: 1e1e1e1e 47ece8b1 0000001f e9c09a7c c2142300 c091aec3 dbbc8980 1f1f1f1f
9a80: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9aa0: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9ac0: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9ae0: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9b00: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9b20: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9b40: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9b60: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9b80: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9ba0: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9bc0: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9be0: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9c00: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9c20: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9c40: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f
9c60: 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 1f1f1f1f 47ece8b1
9c80: 00000020 e9c09c94 c2142300 c091aec3 00000609 20202020 20202020 20202020
9ca0: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9cc0: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9ce0: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9d00: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9d20: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9d40: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9d60: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9d80: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9da0: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9dc0: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9de0: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9e00: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9e20: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9e40: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9e60: 20202020 20202020 20202020 20202020 20202020 20202020 20202020 20202020
9e80: 20202020 20202020 20202020 20202020 20202020 47ece8b1 c17b5920 c1245ebc
9ea0: 0000000e c0d29257 00000006 c091adbf e9c09f78 c091ad19 c33cea80 000e6428
9ec0: 0000000e c2c237f8 e9c09f78 c0690123 e9c09f78 c33cea80 e9c09f78 000e6428
9ee0: c2142300 0000000e c06900f1 c0535171 00000000 00000000 00000000 00000000
9f00: c42203f8 dbc5d414 00000000 00000000 0000000a 47ece8b1 00000000 e9c09fb0
9f20: 0007b5f4 c2142300 80000207 c4195200 c180f5a0 c180f580 c4195240 c040fc2d
9f40: 00000000 00000072 000e3460 c04382d1 47ece8b1 47ece8b1 c33cea80 c33cea80
9f60: 000e6428 c2142300 00000000 00000000 00000004 c0535481 00000000 00000000
9f80: 000e3460 47ece8b1 c0400364 00000001 b6f62070 000e6428 00000004 c0400364
9fa0: c2142300 c0400161 00000001 b6f62070 00000001 000e6428 0000000e 00000000
9fc0: 00000001 b6f62070 000e6428 00000004 000e2c7c 00000020 000e3444 000e3460
9fe0: 000e23b8 be8db878 b6e89960 b6e8997c 60000010 00000001 00000000 00000000
[<c070d0f6>] (mmioset) from [<c091ae9d>] (recursive_loop+0x21/0x50)
[<c091ae9d>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c091aec3>] (recursive_loop+0x47/0x50)
[<c091aec3>] (recursive_loop) from [<c0d29257>] (lkdtm_EXHAUST_STACK+0x23/0x32)
[<c0d29257>] (lkdtm_EXHAUST_STACK) from [<c091adbf>] (direct_entry+0xa7/0xf0)
[<c091adbf>] (direct_entry) from [<c0690123>] (full_proxy_write+0x33/0x54)
[<c0690123>] (full_proxy_write) from [<c0535171>] (vfs_write+0x8d/0x2c8)
[<c0535171>] (vfs_write) from [<c0535481>] (ksys_write+0x41/0x90)
[<c0535481>] (ksys_write) from [<c0400161>] (ret_fast_syscall+0x1/0x54)
Code: 4101 460b 2a10 db1f (e92d) 4100
---[ end trace 5dfadbdbe8c81ed8 ]---