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ircd::allocator: Add mprotect(2) wrappings.

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This commit is contained in:
Jason Volk 2022-01-18 14:47:58 -08:00
parent 55004f054a
commit 271214ff70
2 changed files with 33 additions and 0 deletions
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3
include/ircd/allocator.h
View file

@ -51,6 +51,9 @@ namespace ircd::allocator
size_t prefetch(const const_buffer &);
size_t evict(const const_buffer &);
void protect(const const_buffer &, const bool = true);
void readonly(const mutable_buffer &, const bool = true);
std::unique_ptr<char, decltype(&std::free)>
aligned_alloc(const size_t &align, const size_t &size);
}

30
ircd/allocator.cc
View file

@ -135,6 +135,36 @@ catch(const std::exception &e)
}
#endif
void
ircd::allocator::readonly(const mutable_buffer &buf,
const bool enable)
{
const int prot
{
enable?
PROT_READ:
PROT_READ|PROT_WRITE
};
void *const ptr(mutable_cast(data(buf)));
sys::call(::mprotect, ptr, size(buf), prot);
}
void
ircd::allocator::protect(const const_buffer &buf,
const bool enable)
{
const int prot
{
enable?
PROT_NONE:
PROT_READ|PROT_WRITE
};
void *const ptr(mutable_cast(data(buf)));
sys::call(::mprotect, ptr, size(buf), prot);
}
size_t
ircd::allocator::evict(const const_buffer &buf)
{