Subject: [Bug 215389] pagealloc: memory corruption at building glibc-2.33 and running its' testsuite

From: [email-masked]
Date: Tue, 17 May 2022 08:25:22 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=215389

--- Comment #24 from Christophe Leroy ([email-masked]) ---
Seems like with Inline KASAN your kernel is far too big compared to what we
support at the time being:

c2468000 T __end_rodata
c2800000 T __init_begin
c2800000 T _sinittext

c2801644 T prom_init

The init text section is behind the 32Mbytes boundary, it means that prom_init
and other functions are not called anymore directly but via a trampoline.

c000000c <__start>:
c000000c:       2c 05 00 00     cmpwi   r5,0
c0000010:       41 82 00 1c     beq     c000002c <__start+0x20>
c0000014:       42 9f 00 05     bcl     20,4*cr7+so,c0000018 <__start+0xc>
c0000018:       7d 08 02 a6     mflr    r8
c000001c:       3d 08 00 00     addis   r8,r8,0
c0000020:       39 08 ff e8     addi    r8,r8,-24
c0000024:       48 00 38 e5     bl      c0003908 <setup_disp_bat+0x30>
...
c0003908:       3d 80 c2 80     lis     r12,-15744
c000390c:       39 8c 16 44     addi    r12,r12,5700
c0003910:       7d 89 03 a6     mtctr   r12
c0003914:       4e 80 04 20     bctr

And it cannot work because at that time the kernel is not yet relocated to its
final location.

There was the same problem with PPC64 and it was fix by 24d33ac5b8ff
("powerpc/64s: Make prom_init require RELOCATABLE").

Don't know if a similar approach could work.

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