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Cygwin: Adjust CWD magic to accommodate for the latest Windows previews #86

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Mar 1, 2025
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Cygwin: Adjust CWD magic to accommodate for the latest Windows previews #86

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12 changes: 12 additions & 0 deletions winsup/cygwin/path.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -4794,6 +4794,18 @@ find_fast_cwd_pointer ()
%rcx for the subsequent RtlEnterCriticalSection call. */
lock = (const uint8_t *) memmem ((const char *) use_cwd, 80,
"\x48\x8d\x0d", 3);
if (lock)
{
/* A recent Windows 11 Preview calls `lea rel(rip),%rcx' then
a `mov` and a `movups` instruction, and only then
`callq RtlEnterCriticalSection'.
*/
if (memmem (lock + 7, 8, "\x4c\x89\x78\x10\x0f\x11\x40\xc8", 8))
{
call_rtl_offset = 15;
}
}

if (!lock)
{
/* Windows 8.1 Preview calls `lea rel(rip),%r12' then some unrelated
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