lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Sun, 10 Jan 2021 11:53:50 +0000
From:   Alexander Lobakin <>
To:     Thomas Bogendoerfer <>
Cc:     Arnd Bergmann <>,
        Nathan Chancellor <>,
        Nick Desaulniers <>,
        Huacai Chen <>,
        Pei Huang <>,
        Kees Cook <>,
        Alexander Lobakin <>,
        Fangrui Song <>,
        Jiaxun Yang <>,
        Ralf Baechle <>,
        Corey Minyard <>,,,,,
Subject: [PATCH v5 mips-next 0/9] MIPS: sections fixes & cleanup

This series hunts the problems discovered after manual enabling of
 - adds the missing PAGE_ALIGNED_DATA() section affecting VDSO
   placement (marked for stable);
 - stops blind catching of orphan text sections with .text.*
 - properly stops .eh_frame section generation.

Compile and runtime tested on MIPS32R2 CPS board with no issues
using two different toolkits:
 - Binutils 2.35.1, GCC 10.2.1 (with Alpine patches);
 - LLVM stack: 11.0.0 and from latest Git snapshot.

Since v4 [3]:
 - new: drop redundant .text.cps-vec creation and blind inclusion
   of orphan text sections via .text.* directive in;
 - don't assert SIZEOF(.rel.dyn) as it's reported that it may be not
   empty on certain machines and compilers (Thomas);
 - align GOT table like it's done for ARM64;
 - new: catch UBSAN's "unnamed data" sections in generic definitions
   when building with LD_DEAD_CODE_DATA_ELIMINATION;
 - collect Reviewed-bys (Kees, Nathan).

Since v3 [2]:
 - fix the third patch as GNU stack emits .rel.dyn into VDSO for
   some reason if .cfi_sections is specified.

Since v2 [1]:
 - stop discarding .eh_frame and just prevent it from generating
 - drop redundant sections assertions (Fangrui);
 - place GOT table in .text instead of asserting as it's not empty
   when building with LLVM (Nathan);
 - catch compound literals in generic definitions when building with
 - collect two Reviewed-bys (Kees).

Since v1 [0]:
 - catch .got entries too as LLD may produce it (Nathan);
 - check for unwanted sections to be zero-sized instead of
   discarding (Fangrui).


Alexander Lobakin (9):
  MIPS: add missing PAGE_ALIGNED_DATA() section
  MIPS: CPS: don't create redundant .text.cps-vec section
  MIPS: add ".gnu.attributes" to DISCARDS
  MIPS: properly stop .eh_frame generation
  MIPS: explicitly catch .rel.dyn symbols
  MIPS: explicitly declare .got table catch compound literals into data and BSS catch UBSAN's "unnamed data" into data

 arch/mips/Kconfig                 |  1 +
 arch/mips/include/asm/asm.h       | 18 ++++++++++++++++++
 arch/mips/kernel/cps-vec.S        |  1 -
 arch/mips/kernel/    | 11 +++++++++--
 include/asm-generic/ |  6 +++---
 5 files changed, 31 insertions(+), 6 deletions(-)


Powered by blists - more mailing lists