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hardening fixes for v6.9-rc4

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- gcc-plugins/stackleak: Avoid .head.text section (Ard Biesheuvel)
 
 - ubsan: fix unused variable warning in test module (Arnd Bergmann)
 
 - Improve entropy diffusion in randomize_kstack
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Merge tag 'hardening-v6.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardening fixes from Kees Cook:

 - gcc-plugins/stackleak: Avoid .head.text section (Ard Biesheuvel)

 - ubsan: fix unused variable warning in test module (Arnd Bergmann)

 - Improve entropy diffusion in randomize_kstack

* tag 'hardening-v6.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  randomize_kstack: Improve entropy diffusion
  ubsan: fix unused variable warning in test module
  gcc-plugins/stackleak: Avoid .head.text section
This commit is contained in:
Linus Torvalds 2024-04-10 13:31:34 -07:00
commit fe5b5ef836
3 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/randomize_kstack.h
View File

@ -80,7 +80,7 @@ DECLARE_PER_CPU(u32, kstack_offset);
if (static_branch_maybe(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, \
&randomize_kstack_offset)) { \
u32 offset = raw_cpu_read(kstack_offset); \
offset ^= (rand); \
offset = ror32(offset, 5) ^ (rand); \
raw_cpu_write(kstack_offset, offset); \
} \
} while (0)

2
lib/test_ubsan.c
View File

@ -134,7 +134,7 @@ static const test_ubsan_fp test_ubsan_array[] = {
};
/* Excluded because they Oops the module. */
static const test_ubsan_fp skip_ubsan_array[] = {
static __used const test_ubsan_fp skip_ubsan_array[] = {
test_ubsan_divrem_overflow,
};

2
scripts/gcc-plugins/stackleak_plugin.c
View File

@ -467,6 +467,8 @@ static bool stackleak_gate(void)
return false;
if (STRING_EQUAL(section, ".entry.text"))
return false;
if (STRING_EQUAL(section, ".head.text"))
return false;
}
return track_frame_size >= 0;