Subject: [Bug 205885] New: BUG: KASAN: null-ptr-deref in strncpy+0x3c/0x60

From: [email-masked]
Date: Tue, 17 Dec 2019 00:33:46 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=205885

            Bug ID: 205885
           Summary: BUG: KASAN: null-ptr-deref in strncpy+0x3c/0x60
           Product: Platform Specific/Hardware
           Version: 2.5
    Kernel Version: 5.5-rc2
          Hardware: PPC-32
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PPC-32
          Assignee: [email-masked]
          Reporter: [email-masked]
        Regression: No

Created attachment 286331
  --> https://bugzilla.kernel.org/attachment.cgi?id=286331&action=edit
screenshot (5.5-rc2, PowerMac G4 DP)

I get this hit at booting kernel 5.5-rc2 on my G4 DP:

[...]
BUG: KASAN: null-ptr-deref in strncpy+0x3c/0x60
Read of size 1 at addr 00000000 by task swapper/0/1

CPU: 1 PID: 1 Comm: swapper/0 Tainted: G        W        5.5.0-rc2-PowerMacG4
Call Trace:
[ee8edd78] [c07819e0] dump_stack+0xbc/0x118 (unreliable)
[ee8edda8] [c0244b48] __kasan_report+0x174/0x180
[ee8edde8] [c07949dc] strncpy+0x3c/0x60
[ee8ede18] [c0b6979c] mount_block_root+0x200/0x3e0
[ee8edef8] [c0b69b74] prepare_namespace+0x164/0x174
[ee8edf18] [c0005f3c] kernel_init+0x14/0xf0
[ee8edf38] [c001a348] ret_from_kernel_thread+0x14/0x1c
=================================================================
BUG: Kernel NULL pointer dereference on read at 0x0000000
Faulting instruction address: 0xc07949dc
Oops: Kernel access of bad area sig: 11 (#1]
[...]

For details see screenshot (I appled a median filter but tesseract still was
not able to make much text out of it).

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