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Bug 1819064 - Add a MOZ_NO_STACK_PROTECTOR modifier attribute. r=gstoll

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We define a new MOZ_HAVE_NO_STACK_PROTECTOR modifier attribute. It is
mapped to __attribute__((no_stack_protector)) and specifies that a given
function should *NOT* be instrumented to detect stack buffer overflows
at runtime.

Differential Revision: https://phabricator.services.mozilla.com/D171361
This commit is contained in:
Yannis Juglaret 2023-03-03 15:07:49 +00:00
parent 2b90b67acd
commit 16873187c2
1 changed files with 28 additions and 0 deletions
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28
mfbt/Attributes.h
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@ -70,6 +70,14 @@
# define MOZ_HAVE_NORETURN_PTR __attribute__((noreturn))
#endif
#if defined(__clang__)
# if __has_attribute(no_stack_protector)
# define MOZ_HAVE_NO_STACK_PROTECTOR __attribute__((no_stack_protector))
# endif
#elif defined(__GNUC__)
# define MOZ_HAVE_NO_STACK_PROTECTOR __attribute__((no_stack_protector))
#endif
/*
* When built with clang analyzer (a.k.a scan-build), define MOZ_HAVE_NORETURN
* to mark some false positives
@ -381,6 +389,26 @@
# define MOZ_MAYBE_UNUSED
#endif
/*
* MOZ_NO_STACK_PROTECTOR, specified at the start of a function declaration,
* indicates that the given function should *NOT* be instrumented to detect
* stack buffer overflows at runtime. (The function definition does not need to
* be annotated.)
*
* MOZ_NO_STACK_PROTECTOR int foo();
*
* Detecting stack buffer overflows at runtime is a security feature. This
* modifier should thus only be used on functions which are provably exempt of
* stack buffer overflows, for example because they do not use stack buffers.
*
* This modifier does not affect the corresponding function's linking behavior.
*/
#if defined(MOZ_HAVE_NO_STACK_PROTECTOR)
# define MOZ_NO_STACK_PROTECTOR MOZ_HAVE_NO_STACK_PROTECTOR
#else
# define MOZ_NO_STACK_PROTECTOR /* no support */
#endif
#ifdef __cplusplus
/**