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acca57217c
PPC32 encounters a KUAP fault when trying to handle a signal with
VDSO unmapped.
Kernel attempted to read user page (7fc07ec0) - exploit attempt? (uid: 0)
BUG: Unable to handle kernel data access on read at 0x7fc07ec0
Faulting instruction address: 0xc00111d4
Oops: Kernel access of bad area, sig: 11 [#1]
BE PAGE_SIZE=16K PREEMPT CMPC885
CPU: 0 PID: 353 Comm: sigreturn_vdso Not tainted 5.12.0-rc4-s3k-dev-01553-gb30c310ea220 #4814
NIP: c00111d4 LR: c0005a28 CTR: 00000000
REGS: cadb3dd0 TRAP: 0300 Not tainted (5.12.0-rc4-s3k-dev-01553-gb30c310ea220)
MSR: 00009032 <EE,ME,IR,DR,RI> CR: 48000884 XER: 20000000
DAR: 7fc07ec0 DSISR: 88000000
GPR00: c0007788 cadb3e90 c28d4a40 7fc07ec0 7fc07ed0 000004e0 7fc07ce0 00000000
GPR08: 00000001 00000001 7fc07ec0 00000000 28000282 1001b828 100a0920 00000000
GPR16: 100cac0c 100b0000 105c43a4 105c5685 100d0000 100d0000 100d0000 100b2e9e
GPR24: ffffffff 105c43c8 00000000 7fc07ec8 cadb3f40 cadb3ec8 c28d4a40 00000000
NIP [c00111d4] flush_icache_range+0x90/0xb4
LR [c0005a28] handle_signal32+0x1bc/0x1c4
Call Trace:
[cadb3e90] [100d0000] 0x100d0000 (unreliable)
[cadb3ec0] [c0007788] do_notify_resume+0x260/0x314
[cadb3f20] [c000c764] syscall_exit_prepare+0x120/0x184
[cadb3f30] [c00100b4] ret_from_syscall+0xc/0x28
--- interrupt: c00 at 0xfe807f8
NIP: 0fe807f8 LR: 10001060 CTR: c0139378
REGS: cadb3f40 TRAP: 0c00 Not tainted (5.12.0-rc4-s3k-dev-01553-gb30c310ea220)
MSR: 0000d032 <EE,PR,ME,IR,DR,RI> CR: 28000482 XER: 20000000
GPR00: 00000025 7fc081c0 77bb1690 00000000 0000000a 28000482 00000001 0ff03a38
GPR08: 0000d032 00006de5 c28d4a40 00000009 88000482 1001b828 100a0920 00000000
GPR16: 100cac0c 100b0000 105c43a4 105c5685 100d0000 100d0000 100d0000 100b2e9e
GPR24: ffffffff 105c43c8 00000000 77ba7628 10002398 10010000 10002124 00024000
NIP [0fe807f8] 0xfe807f8
LR [10001060] 0x10001060
--- interrupt: c00
Instruction dump:
38630010 7c001fac 38630010 4200fff0 7c0004ac 4c00012c 4e800020 7c001fac
2c0a0000 38630010 4082ffcc 4bffffe4 <7c00186c> 2c070000 39430010 4082ff8c
---[ end trace 3973fb72b049cb06 ]---
This is because flush_icache_range() is called on user addresses.
The same problem was detected some time ago on PPC64. It was fixed by
enabling KUAP in commit
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.