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Cygwin: shared: Fix access permissions setting in open_shared(). 

After the commit 62f11a5a57, the access permissions argument passed
to open_shared() is ignored and always replaced with (FILE_MAP_READ |
FILE_MAP_WRITE). This causes the weird behaviour that sshd service
process loses its cygwin PID. This triggers the failure in pty that
transfer_input() does not work properly.

This patch resumes the access permission settings to fix that.

Fixes: 62f11a5a57 ("Cygwin: open_shared: don't reuse shared_locations parameter as output")
Fixes: fb16f490bf ("Cygwin: open_shared: try harder allocating a shared region")
Reviewed-by: Corinna Vinschen <corinna@vinschen.de>
Signedd-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
This commit is contained in:
Takashi Yano 2023-08-16 08:00:27 +09:00
parent efba30dd1d
commit c3eab1e295
2 changed files with 6 additions and 6 deletions
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9
winsup/cygwin/mm/shared.cc
View File

@ -148,8 +148,7 @@ open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size,
if (name)
mapname = shared_name (map_buf, name, n);
if (m == SH_JUSTOPEN)
shared_h = OpenFileMappingW (FILE_MAP_READ | FILE_MAP_WRITE, FALSE,
mapname);
shared_h = OpenFileMappingW (access, FALSE, mapname);
else
{
created = true;
@ -175,8 +174,7 @@ open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size,
Note that we don't actually *need* fixed addresses. The only
advantage is reproducibility to help /proc/<PID>/maps along. */
addr = (void *) region_address[m];
shared = MapViewOfFileEx (shared_h, FILE_MAP_READ | FILE_MAP_WRITE,
0, 0, 0, addr);
shared = MapViewOfFileEx (shared_h, access, 0, 0, 0, addr);
}
/* Also catch the unlikely case that a fixed region can't be mapped at the
fixed address. */
@ -190,8 +188,7 @@ open_shared (const WCHAR *name, int n, HANDLE& shared_h, DWORD size,
do
{
addr = (void *) next_address;
shared = MapViewOfFileEx (shared_h, FILE_MAP_READ | FILE_MAP_WRITE,
0, 0, 0, addr);
shared = MapViewOfFileEx (shared_h, access, 0, 0, 0, addr);
next_address += wincap.allocation_granularity ();
if (next_address >= SHARED_REGIONS_ADDRESS_HIGH)
{

3
winsup/cygwin/release/3.4.8
View File

@ -17,3 +17,6 @@ Bug Fixes
- Fix memory leak in printf() regarding gdtoa-based _ldtoa_r().
Addresses: https://cygwin.com/pipermail/cygwin/2023-July/254054.html
- Fix a bug introduced in cygwin 3.4.5 that open_shared() does not set
access permissions as requested by its argument.