On 2023-04-18 10:47, Christoph Reiter wrote:
On Tue, Apr 18, 2023 at 9:44 AM Corinna Vinschen wrote:
Pash pushed. I new rebase 4.6.3 release with your patch is just
building.
Extended DLL Characteristics was added for IBT/CET/CFI and AMD/Intel Shadow
Stack support has been available since W10 [20]20H1/[20]2004 in a PE Debug
Directory entry with Debug Type IMAGE_DEBUG_TYPE_EX_DLLCHARACTERISTICS (20.)
with value IMAGE_DLLCHARACTERISTICS_EX_CET_COMPAT (1)
https://learn.microsoft.com/en-us/windows/win32/debug/pe-format#extended-dll-characteristics
Are there any plans to support those debug directory entries and flags in
genpeimg and/or peflags, and Windows shadow stack support in mingw64 and/or Cygwin?
The Linux implementation is discussed in https://lwn.net/Articles/883340/ as
Intel architected the (soon former) Linux CoW PTE bit combo Write 0 Dirty 1 as
Shadow Stack page flag, possibly anticipating that they could contribute kernel
patches to work around this more quickly than has transpired.
I got interested in this as I plan to add Linux cpuinfo flag user_shstk, on
recent CPUs and Windows releases with that support, to next Cygwin cpuinfo patch.
--
Take care. Thanks, Brian Inglis Calgary, Alberta, Canada
La perfection est atteinte Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut
-- Antoine de Saint-Exupéry
