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SubjectNokia N900: insecure W+X mapping at 0xd0050000
Hi!

Insecure W+X mappings, who cares about those? I have 7 pages...

Pavel

[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.16.0-rc3-next-20180302 (pavel@duo) (gcc
version 4.7.2 (GC
C)) #70 Fri Mar 2 10:16:00 CET 2018
[ 0.000000] CPU: ARMv7 Processor [411fc083] revision 3 (ARMv7),
cr=10c5387d
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT
nonaliasing instruction cac
...
[ 1.266693] ------------[ cut here ]------------
[ 1.271606] WARNING: CPU: 0 PID: 1 at lib/refcount.c:187
refcount_sub_and_test+0x94/0xa8
[ 1.280181] refcount_t: underflow; use-after-free.
[ 1.285247] Modules linked in:
...
[ 4.557220] devtmpfs: mounted
[ 4.569610] Freeing unused kernel memory: 1024K
[ 4.581481] ------------[ cut here ]------------
[ 4.592376] WARNING: CPU: 0 PID: 1 at arch/arm/mm/dump.c:253
note_page+0x2f8/0x328
[ 4.606658] arm/mm: Found insecure W+X mapping at address
0xd0050000
[ 4.619781] Modules linked in:
[ 4.629272] CPU: 0 PID: 1 Comm: swapper Tainted: G W
4.16.0-rc3-next-20180302 #70
[ 4.645111] Hardware name: Nokia RX-51 board
[ 4.655944] [<c010d6cc>] (unwind_backtrace) from [<c010b560>]
(show_stack+0x10/0x14)
[ 4.670593] [<c010b560>] (show_stack) from [<c0127dec>]
(__warn+0xe8/0x110)
[ 4.684295] [<c0127dec>] (__warn) from [<c0127edc>]
(warn_slowpath_fmt+0x38/0x48)
[ 4.698455] [<c0127edc>] (warn_slowpath_fmt) from [<c0113aa8>]
(note_page+0x2f8/0x328)
[ 4.713134] [<c0113aa8>] (note_page) from [<c0113b60>]
(walk_pgd+0x88/0x178)
[ 4.726837] [<c0113b60>] (walk_pgd) from [<c0113d28>]
(ptdump_check_wx+0x64/0xb8)
[ 4.741210] [<c0113d28>] (ptdump_check_wx) from [<c0716428>]
(kernel_init+0x24/0x108)
[ 4.755859] [<c0716428>] (kernel_init) from [<c01010e8>]
(ret_from_fork+0x14/0x2c)
[ 4.770294] Exception stack(0xce049fb0 to 0xce049ff8)
[ 4.781921] 9fa0: 00000000
00000000 00000000 00000000
[ 4.796966] 9fc0: 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[ 4.812011] 9fe0: 00000000 00000000 00000000 00000000 00000013
00000000
[ 4.825378] ---[ end trace dcb3a72772bbfe7c ]---
[ 4.837005] Checked W+X mappings: FAILED, 7 W+X pages found

--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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