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kernel hardening fix for v6.1-rc4

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- Correctly report struct member size on memcpy overflow (Kees Cook)
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Merge tag 'hardening-v6.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardening fix from Kees Cook:

 - Correctly report struct member size on memcpy overflow (Kees Cook)

* tag 'hardening-v6.1-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  fortify: Capture __bos() results in const temp vars
This commit is contained in:
Linus Torvalds 2022-11-04 14:46:45 -07:00
commit bd74502743
1 changed files with 9 additions and 4 deletions
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13
include/linux/fortify-string.h
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@ -454,13 +454,18 @@ __FORTIFY_INLINE bool fortify_memcpy_chk(__kernel_size_t size,
#define __fortify_memcpy_chk(p, q, size, p_size, q_size, \
p_size_field, q_size_field, op) ({ \
size_t __fortify_size = (size_t)(size); \
WARN_ONCE(fortify_memcpy_chk(__fortify_size, p_size, q_size, \
p_size_field, q_size_field, #op), \
const size_t __fortify_size = (size_t)(size); \
const size_t __p_size = (p_size); \
const size_t __q_size = (q_size); \
const size_t __p_size_field = (p_size_field); \
const size_t __q_size_field = (q_size_field); \
WARN_ONCE(fortify_memcpy_chk(__fortify_size, __p_size, \
__q_size, __p_size_field, \
__q_size_field, #op), \
#op ": detected field-spanning write (size %zu) of single %s (size %zu)\n", \
__fortify_size, \
"field \"" #p "\" at " __FILE__ ":" __stringify(__LINE__), \
p_size_field); \
__p_size_field); \
__underlying_##op(p, q, __fortify_size); \
})