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Adjust CWD magic to accommodate for the latest Windows previews #52

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Merged
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May 18, 2023
Merged

Adjust CWD magic to accommodate for the latest Windows previews #52

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18 changes: 16 additions & 2 deletions winsup/cygwin/path.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -4581,10 +4581,24 @@ find_fast_cwd_pointer ()
or, then `mov %r12,%rcx', then `callq RtlEnterCriticalSection'. */
lock = (const uint8_t *) memmem ((const char *) use_cwd, 80,
"\x4c\x8d\x25", 3);
if (!lock)
return NULL;
call_rtl_offset = 14;
}

if (!lock)
{
/* A recent Windows Preview calls `lea rel(rip),%r13' then
some unrelated instructions, then `callq RtlEnterCriticalSection'.
*/
lock = (const uint8_t *) memmem ((const char *) use_cwd, 80,
"\x4c\x8d\x2d", 3);
call_rtl_offset = 24;
}

if (!lock)
{
return NULL;
}

PRTL_CRITICAL_SECTION lockaddr =
(PRTL_CRITICAL_SECTION) (lock + 7 + peek32 (lock + 3));
/* Test if lock address is FastPebLock. */
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