linux-kernel - [GIT PULL] Modules updates for v5.8

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Date:   Fri, 5 Jun 2020 11:33:56 +0200
From:   Jessica Yu <jeyu@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [GIT PULL] Modules updates for v5.8

Hi Linus,

Please pull below to receive modules updates for the v5.8 merge window.
Details can be found in the signed tag.

There was a small conflict with the livepatching tree, which has already been
merged into master. Inlined below you'll find the conflict resolution merging
modules-next into mainline. It should be straightforward, but please let me
know if you run into any issues. Thanks!

diff --cc kernel/module.c
index bca993c5f1bc,70fc20583e66..ef400c389f49
--- a/kernel/module.c
+++ b/kernel/module.c
@@@ -2026,20 -2052,29 +2042,29 @@@ static void module_enable_nx(const stru
  	frob_writable_data(&mod->init_layout, set_memory_nx);
  }
  
+ static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
+ 				       char *secstrings, struct module *mod)
+ {
+ 	const unsigned long shf_wx = SHF_WRITE|SHF_EXECINSTR;
+ 	int i;
+ 
+ 	for (i = 0; i < hdr->e_shnum; i++) {
+ 		if ((sechdrs[i].sh_flags & shf_wx) == shf_wx)
+ 			return -ENOEXEC;
+ 	}
+ 
+ 	return 0;
+ }
+ 
  #else /* !CONFIG_STRICT_MODULE_RWX */
 -/* module_{enable,disable}_ro() stubs are in module.h */
  static void module_enable_nx(const struct module *mod) { }
 +static void module_enable_ro(const struct module *mod, bool after_init) {}
- #endif /*  CONFIG_STRICT_MODULE_RWX */
- static void module_enable_x(const struct module *mod)
+ static int module_enforce_rwx_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
+ 				       char *secstrings, struct module *mod)
  {
- 	frob_text(&mod->core_layout, set_memory_x);
- 	frob_text(&mod->init_layout, set_memory_x);
+ 	return 0;
  }
- #else /* !CONFIG_ARCH_HAS_STRICT_MODULE_RWX */
- static void module_enable_nx(const struct module *mod) { }
- static void module_enable_x(const struct module *mod) { }
- #endif /* CONFIG_ARCH_HAS_STRICT_MODULE_RWX */
- 
+ #endif /*  CONFIG_STRICT_MODULE_RWX */
  
  #ifdef CONFIG_LIVEPATCH
  /*

---
The following changes since commit 8f3d9f354286745c751374f5f1fcafee6b3f3136:

  Linux 5.7-rc1 (2020-04-12 12:35:55 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux.git tags/modules-for-v5.8

for you to fetch changes up to 5c3a7db0c7ec4bbd5bd3f48af9be859a8fa3e532:

  module: Harden STRICT_MODULE_RWX (2020-04-21 17:20:13 +0200)

----------------------------------------------------------------
Modules updates for v5.8

Summary of modules changes for the 5.8 merge window:

- Harden CONFIG_STRICT_MODULE_RWX by rejecting any module that has
  SHF_WRITE|SHF_EXECINSTR sections
- Remove and clean up nested #ifdefs, as it makes code hard to read

Signed-off-by: Jessica Yu <jeyu@...nel.org>

----------------------------------------------------------------
Jessica Yu (1):
      module: break nested ARCH_HAS_STRICT_MODULE_RWX and STRICT_MODULE_RWX #ifdefs

Peter Zijlstra (1):
      module: Harden STRICT_MODULE_RWX

 kernel/module.c | 51 +++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 41 insertions(+), 10 deletions(-)