Takashi Yano [Mon, 28 Aug 2023 13:14:41 +0000 (22:14 +0900)]
Cygwin: Fix segfalt when too many command line args are specified.
Previously, the number of command line args was not checked for
cygwin process. Due to this, segmentation fault was caused if too
many command line args are specified.
https://cygwin.com/pipermail/cygwin/2023-August/254333.html
Since char *argv[argc + 1] is placed on the stack in dll_crt0_1(),
STATUS_STACK_OVERFLOW occurs if the stack does not have enough
space.
With this patch, char *argv[] is placed in heap instead of stack
and ARG_MAX is increased from 32000 to 2097152 which is default
value of Linux. The argument length is also compared with ARG_MAX
and spawnve() returns E2BIG if it is too long.
Takashi Yano [Sat, 19 Aug 2023 05:10:16 +0000 (14:10 +0900)]
Cygwin: pty: Fix failure to clear switch_to_nat_pipe flag.
After the commit fbfea31dd9b9, switch_to_nat_pipe is not cleared
properly when non-cygwin app is terminated in the case where the
pseudo console is disabled. This is because get_winpid_to_hand_over()
sometimes returns PID of cygwin process even though it should return
only PID of non-cygwin process. This patch fixes the issue by adding
a new argument which requests only PID of non-cygwin process to
get_console_process_id().
Fixes: fbfea31dd9b9 ("Cygwin: pty: Avoid cutting the branch the pty master is sitting on.") Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
Takashi Yano [Tue, 15 Aug 2023 23:00:27 +0000 (08:00 +0900)]
Cygwin: shared: Fix access permissions setting in open_shared().
After the commit 93508e5bb841, 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.
Takashi Yano [Mon, 14 Aug 2023 10:48:12 +0000 (19:48 +0900)]
Cygwin: pty: Add missing pinfo check in transfer_input().
The commit 10d083c745dd has a bug that lacks a check for pinfo pointer
value for master_pid. This causes segmentation fault if the process
whose pid is master_pid no longer exists. This patch fixes the issue.
Fixes: 10d083c745dd ("Cygwin: pty: Inherit typeahead data between two input pipes.") Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
Corinna Vinschen [Tue, 15 Aug 2023 20:34:29 +0000 (22:34 +0200)]
Cygwin: cXXrtomb, mbrtcXX: use function-specific internal state
As described in the previous commit b5111e46424b
("struct _reent: add state for unicode functions") every unicode
conversion function has to use their own state object, if the
state parameter is NULL.
Corinna Vinschen [Tue, 15 Aug 2023 20:30:59 +0000 (22:30 +0200)]
struct _reent: add state for unicode functions
C23 requires that the unicode functions c16rtomb, c8rtomb, mbrtoc16,
mbrtoc32 and mbrtoc8 use their own internal state object. c32rtomb
only needs an internal state if the lib supports encoding with
shift states, but that's the case for newlib and Cygwin.
Only Cygwin implements these functions so add the states
objects only for Cygwin for now.
sys/unistd.h: define GNU extensions SEEK_DATA and SEEK_HOLE
SEEK_DATA and SEEK_HOLE are GNU nonstandard extensions also present
in Solaris, FreeBSD, and DragonFly BSD; they are proposed for inclusion
in the next POSIX revision (Issue 8).
Cygwin: fix build failure due to redefinition of __restrict in sys/cdefs.h
Commit 3c75fac130b5 fixed the __restrict definition in sys/cdefs.h,
but uncovered a problem in the definition of lio_listio in Cygwin's
aio.h. It uses the C99 extension of using the restrict keyword
to define non-overlapping arrays. However, this is not allowed in
C++.
Use the newly defined __restrict_arr from commit e66c63be6b80
("sys/cdefs.h: introduce __restrict_arr, as in glibc")
Fixes: 3c75fac130b5 ("sys/cdefs.h: fix for use __restrict in C++" Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
As an extension, GCC and clang offer C99-style restricted pointers in
C++ mode:
https://gcc.gnu.org/onlinedocs/gcc/Restricted-Pointers.html
We notice that this extension is broken when including newlib headers:
restricted pointers are treated as ordinary pointers.
We traced this to the following section of
newlib/libc/include/sys/cdefs.h:
/*
* GCC 2.95 provides `__restrict' as an extension to C90 to support the
* C99-specific `restrict' type qualifier. We happen to use `__restrict' as
* a way to define the `restrict' type qualifier without disturbing older
* software that is unaware of C99 keywords.
*/
#if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95)
#if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901
#define __restrict
#else
#define __restrict restrict
#endif
#endif
While the GCC __restrict extension was indeed introduced in GCC 2.95, it
is not limited to this version; the extension is also not limited to
C90:
https://gcc.gnu.org/gcc-2.95/c++features.html
Rewrite the logic in the header so that __restrict is kept alone when
available.
Takashi Yano [Fri, 4 Aug 2023 08:45:34 +0000 (17:45 +0900)]
Cygwin: pty: Fix thread safety of readahead buffer handling in pty master.
Previously, though readahead buffer handling in pty master was not
fully thread-safe, accept_input() was called from peek_pipe() thread
in select.cc. This caused the problem reported in:
https://cygwin.com/pipermail/cygwin/2023-July/253984.html
The mechanism of the problem is:
1) accept_input() which is called from peek_pipe() thread calls
eat_readahead(-1) before reading readahead buffer. This allows
writing to the readahead buffer from another (main) thread.
2) The main thread calls fhandler_pty_master::write() just after
eat_readahead(-1) was called and before reading the readahead
buffer by accept_input() called from peek_pipe() thread. This
overwrites the readahead buffer.
3) The read result from readahead buffer which was overwritten is
sent to the slave.
This patch makes readahead buffer handling fully thread-safe using
input_mutex to resolve this issue.
Fixes: 7b03b0d8cee0 ("select.cc (peek_pipe): Call flush_to_slave whenever we're checking for a pty master.") Reported-by: Thomas Wolff <towo@towo.net> Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
Cygwin: uchar.h: fix definition of uchar16_t and uchar32_t
Per C++11, uchar16_t and uchar32_t are defined the same as
uint_least16_t and uint_least32_t. Also, check for the C++
version to make sure that the types are not colliding with
predefined c++ types.
After the commit a4705d387f78, printf() for floating-point values
causes a memory leak. The legacy _ldtoa_r() assumed the char pointer
returned will be free'ed by Bfree(). However, gdtoa-based _ldtoa_r()
returns the pointer returned by gdtoa() which should be free'ed by
freedtoa(). Due to this issue, the caller of _ldtoa_r() fails to free
the allocated char buffer. This is the cause of the said memory leak.
https://cygwin.com/pipermail/cygwin/2023-July/254054.html
This patch makes rv_alloc()/freedtoa() allocate/free the buffer in
a compatible way with legacy _ldtoa_r().
The FD_WRITE event is a false friend. It indicates ready to write
even if the next send fails with WSAEWOULDBLOCK. *After* the fact,
FD_WRITE will be cleared until sending is again possible, but that
is too late for a select/write loop.
Workaround that by using the WinSock select function when peeking
at a socket and FD_WRITE gets indicated. WinSock select fortunately
indicates writability correctly.
Fixes: 70e476d27be8 ("(peek_socket): Use event handling for peeking socket.") Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This macro loads and defines a function just as usual, except
that the Windows function is exposed only with the prefix
_win32_. So Windows select (the immediate victim) is only
exposed as _win32_select. That allows to autoload the windows
function without collision with a Cygwin function of the same
name.
For a start, only define the most simple macro, setting all
extensions to 0.
Cygwin: Add ISO C11 functions c16rtomb, c32rtomb, mbrtoc16, mbrtoc32.
Add uchar.h accordingly.
For the c32 functions, use the internal functions wirtomb and mbrtowi
as base, and convert wirtomb and mbrtowi to inline functions calling
the c32 functions.
The changes to support GB18030 were insufficient and the underlying
Windows conversion functions just failed. Fix how the Windows functions
are called for GB18030.
Fixes: 5da71b605995 ("Cygwin: add support for GB18030 codeset") Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
For some reason lost in time, commit 2b77087a48ea5 introduced
Cygwin-specific code treating single byte characters outside the
portable character set as illegal chars. However, Cygwin was
always alone with this over-correct behaviour and it leads to
stuff like gnulib replacing functions defined in Cygwin with
their own implementation just due to that.
Revert this change, sans the changes to ChangeLog.
Cygwin: belatedly bump CYGWIN_VERSION_API_MINOR for new posix_spawn funcs
Commit c743751aafa84 ("Cygwin: Export
posix_spawn_file_actions_add{f}chdir_np")
added two new functions but we forgot to bump the API version.
Catch up.
Commit c36064bbd0c5 introduced operating on character pointers
instead of operating on characters, to allow collating symbols.
This patch neglected to change the expression for range
comparison in case we're in the C locale. Thus it suddenly
compared pointers instead of characters. Fix that.
Fixes: c36064bbd0c5 ("Cygwin: fnmatch: support collating symbols in [. .] brackets") Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Fix rounding results in lrint() & llrint() when close to 0
soft-fp should round floating pointer numbers according to the current
rounding mode. However, in the current code of lrint() and llrint(),
there are if statements before the actual rounding computation
if(j0 < -1)
return 0;
Where j0 is the exponent of the floating point number.
It means any number having a exponent less than -1
(i.e. interval (-0.5, 0.5)) will be rounded to 0 regardeless of the
rounding mode.
The bug already fixed in glibc in 2006 by moving the check afterwards
the rounding computation, but still persists in newlib.
Rename _NL_CTYPE_OUTDIGITSx_MB/WC to _NL_CTYPE_OUTDIGITx_MB/WC
The extended _NL_foo names were originally designed after their GLibc
counterparts. However, the OUTDIGIT macros were accidentally defined as
OUTDIGITS, plural. Fix them.
Fixes: d47d5b850bed ("Extend locale support to maintain wide char values of native strings") Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Zfinx/Zdinx are new extensions ratified in 2022, it similar to F/D extensions,
support hard float operation for single/double precision, but the difference
between Zfinx/Zdinx and F/D is Zfinx/Zdinx is operating under general purpose
registers rather than dedicated floating-point registers.
This patch improve the hard float support detection for RISC-V port, so
that Zfinx/Zdinx can have better/right performance.
The GLIBC extension AT_EMPTY_PATH allows the functions fchownat
and fstatat to operate on dirfd alone, if the given pathname is an
empty string. This also allows to operate on any file type, not
only directories.
Commit fa84aa4dd2fb4 broke this. It only allows dirfd to be a
directory in calls to these two functions.
Fix that by handling AT_EMPTY_PATH right in gen_full_path_at.
A valid dirfd and an empty pathname is now a valid combination
and, noticably, this returns a valid path in path_ret. That
in turn allows to remove the additional path generation code
from the callers.
Fixes: fa84aa4dd2fb ("Cygwin: fix errno values set by readlinkat") Reported-by: Johannes Schindelin <johannes.schindelin@gmx.de> Tested-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Convert gen_full_path_at to take flag values from the caller, rather
than just a bool indicating that empty paths are allowed. This is in
preparation of a better AT_EMPTY_PATH handling in a followup patch.
Reviewed-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Cygwin needs an internal flag to allow specifying an empty pathname
in utimesat (GLIBC extension). We define it in _default_fcntl.h to
make sure we never introduce a value collision accidentally.
While at it, define the values as 16 bit hex values.
Reviewed-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
The check if the local variable p is NULL is useless. The preceeding
code always sets p to a valid pointer, or it crashes if path_ret is
invalid (which would be a bug in Cygwin).
Jon Turney [Sat, 22 Jul 2023 12:23:15 +0000 (13:23 +0100)]
Cygwin: CI: Upgrade checkout actions to avoid deprecation warning
Also: workaround a problem with actions/checkout's post-run step using
Cygwin git but being incompatible with it. (This would be better solved
by cygwin-install-action having a post-run step to unwind it's PATH
changes, but that's not currently possible)
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Jon Turney [Wed, 24 Aug 2022 17:21:18 +0000 (18:21 +0100)]
Cygwin: testsuite: Drop using DejaGnu to run tests
A more sophisticated (and modern) test harness would probably be useful,
but switching to Automake's built-in test harness gets us parallel test
execution, colourization of failures, simplifies matters, seems adequate
for the current testuite, and means we don't need to write any icky Tcl.
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Cygwin: get_posix_access: do not merge permissions for just created files
When creating the POSIX ACL rewrite, the code merging permissions from
everyone/group to group/user ACEs was accidentally called for newly
generated files as well.
This could result in broken permissions, if umask used unusual values
like "0100", granted permissions to everyone/group not granted to
group/user.
Make sure to skip permission merging if the file got just created and
we only want to set correct permissions for the first time.
Jon Turney [Fri, 21 Jul 2023 13:22:27 +0000 (14:22 +0100)]
Cygwin: Fix uninitialized use of fh in strace output in stat_worker()
Move strace output to fix uninitalized use of fh introduced in previous commit.
../../../../src/winsup/cygwin/syscalls.cc: In function ‘int stat_worker(path_conv&, stat*)’:
../../../../src/winsup/cygwin/syscalls.cc:1971:69: error: ‘fh’ may be used uninitialized [-Werror=maybe-uninitialized]
Fixes: 42b44044b34d ("Cygwin: Fix Windows file handle leak in stat("file", -1)") Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Cygwin: don't wait infinitely on a pthread cancel event
Starting with commit 42faed412857 ("* thread.h (class pthread): Add bool
member canceled."), pthread::testcancel waits infinitely on cancel_event
after it checked if the canceled variable is set. However, this might
introduce a deadlock, if the thread calling pthread_cancel is terminated
after setting canceled to true, but before calling SetEvent on cancel_event.
In fact, it's not at all necessary to wait infinitely. By definition,
the thread is only canceled if cancel_event is set. The canceled
variable is just a helper to speed up code. We can safely assume that
the thread hasn't been canceled yet, if canceled is set, but cancel_event
isn't.
Jon Turney [Sat, 15 Jul 2023 16:57:43 +0000 (17:57 +0100)]
Cygwin: testsuite: Make cancel3 and cancel5 more robust
Despite our efforts, sometimes the async cancellation gets deferred.
Notice this by calling pthread_testcancel(), and then try to work out if
async cancellation was ever successful by checking if all threads ran
for the full expected time, or if some were stopped early.
Also, increase the time we allow for the async cancellation to get
delivered to 30 seconds.
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Jon Turney [Sun, 16 Jul 2023 13:46:00 +0000 (14:46 +0100)]
Cygwin: Restore signal handlers on thread cancellation during system()
Add back the restoration of signal handlers modified during system() on
thread cancellation.
Removed in 3cb9da14 which describes it as 'ill-conceived' (additional
context doesn't appear to be available).
We use the internal implementation helpers for the pthread cleanup
chain, so we can neatly tuck it inside the object, and keep the point
when we restore the signal handlers the same. (The
pthread_cleanup_push/pop() functions are implemented as macros which
must appear in the same lexical scope.)
Fixes: 3cb9da14617c ("Put signals on hold and use system_call_cleanup
class to set and restore signals rather than doing it prior to to
running the program. Remove the ill-conceived pthread_cleanup stuff.") Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Jon Turney [Thu, 6 Jul 2023 15:39:13 +0000 (16:39 +0100)]
Cygwin: pthread: Take note of schedparam in pthread_create
Take note of schedparam in any pthread_attr_t passed to pthread_create.
postcreate() (racily, after the thread is actually created), sets the
scheduling priority if it's inherited, but precreate() doesn't store any
scheduling priority explicitly set via a non-default attr to
pthread_create, so schedparam.sched_priority has the default value of 0.
(I think this is another long-standing bug exposed by 4b51e4c1. Now we
don't lie about the actual thread priority, it's apparent it's not
really being set in this case.)
Fixes testcase priority2.
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Jon Turney [Mon, 10 Jul 2023 18:04:58 +0000 (19:04 +0100)]
Cygwin: testsuite: Busy-wait in cancel3 and cancel5
These tests async thread cancellation of a thread that doesn't have any
cancellation points.
Unfortunately, since 2b165a45 the async cancellation silently fails when
the thread is inside the kernel function Sleep(), so it just exits
normally after 10 seconds. (See the commentary in pthread::cancel() in
thread.cc, where it checks if the target thread is inside the kernel,
and silently converts the cancellation into a deferred one)
Work around this by busy-waiting rather than Sleep()ing for 10 seconds.
This is still somewhat fragile: the async cancel could still fail, if it
happens to occur while we're inside the kernel function that time()
calls.
v2:
Do nothing more efficiently
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Jon Turney [Thu, 1 Sep 2022 11:13:50 +0000 (12:13 +0100)]
Cygwin: testsuite: Fix for limited thread priority values
Since commit 4b51e4c1, we return the actual thread priority, not what we
originally stored in the thread attributes.
Windows only supports 7 thread priority levels, which we map onto the 32
required by POSIX. So, only a subset of values will be returned exactly
by by pthread_getschedparam() after pthread_setschedparam().
Adjust tests priority1, priority2 and inherit1 so they only check for
round-tripping priority values which can be exactly represented.
For CI, this needs to handle process priority class "below normal
priority" as well.
Also check that the range of priority values is at least 32, as required
by POSIX.
Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>
Mark Geisert [Sun, 9 Jul 2023 07:59:22 +0000 (00:59 -0700)]
Cygwin: Make gcc-specific code in <sys/cpuset.h> compiler-agnostic
The current version of <sys/cpuset.h> cannot be compiled by Clang due to
the use of builtin versions of malloc, free, and memset. Their presence
here was a dubious optimization anyway, so their usage has been
converted to standard library functions.
The use of __builtin_popcountl remains because Clang implements it just
like gcc does. If/when some other compiler (Rust? Go?) runs into this
issue we can deal with specialized handling then.
The "#include <sys/cdefs>" here to define __inline can be removed since
both of the new includes sub-include it.
Addresses: https://cygwin.com/pipermail/cygwin/2023-July/253927.html Fixes: 9cc910dd33a5 (Cygwin: Make <sys/cpuset.h> safe for c89 compilations) Signed-off-by: Mark Geisert <mark@maxrnd.com>
Cygwin: fstat(): Fix st_rdev returned by fstat() for /dev/tty.
While st_rdev returned by fstat() for /dev/tty should be FH_TTY,
the current cygwin1.dll returns FH_PTYS+minor or FH_CONS+minor.
Similarly, fstat() does not return correct value for /dev/console,
/dev/conout, /dev/conin or /dev/ptmx.
This patch fixes the issue by:
1) Introduce dev_referred_via in fhandler_termios.
2) Add new argument, which has dev_t value referred by open(),
for constructors of fhandler_pty_slave and fhandler_pty_master to
set the value of dev_referred_via.
3) Set st_rdev using dev_referred_via in fhandler_termios::fstat()
if it is available.
Cygwin: stat(): Fix "Bad address" error on stat() for /dev/tty.
As reported in
https://cygwin.com/pipermail/cygwin/2023-June/253888.html,
"Bad address" error occurs when stat() is called after the commit 3721a756b0d8 ("Cygwin: console: Make the console accessible from
other terminals.").
There are two problems in the current code. One is fhandler_console::
fstat() calls get_ttyp()->getsid(). However, fh_alloc() in dtable.cc
omits to initialize the fhandler_console instance when stat() is
called. Due to this, get_ttyp() returns NULL and access violation
occurs. The other problem is fh_alloc() assigns fhandler_console
even if the CTTY is not a console. So the first problem above occurs
even if the CTTY is a pty.
This patch fixes the issue by:
1) Call set_unit() to initialize _tc if the get_ttyp() returns NULL.
2) Assign fhandler_pty_slave for /dev/tty if CTTY is a pty in fh_alloc().
Fixes: 3721a756b0d8 ("Cygwin: console: Make the console accessible
from other terminals."). Fixes: 23771fa1f7028 ("dtable.cc (fh_alloc): Make different decisions
when generating fhandler for not-opened devices. Add kludge to deal
with opening /dev/tty.") Reported-by: Bruce Jerrick <bmj001@gmail.com> Reviewed-by: Corinna Vinschen <corinna@vinschen.de> Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
Mark Geisert [Tue, 4 Jul 2023 00:51:41 +0000 (17:51 -0700)]
Cygwin: Make <sys/cpuset.h> safe for c89 compilations
Four modifications to include/sys/cpuset.h:
* Change C++-style comments to C-style also supported by C++
* Change "inline" to "__inline" on code lines
* Add "#include <sys/cdefs.h>" to make sure __inline is defined
* Don't declare loop variables on for-loop init clauses
Tested by first reproducing the reported issue with home-grown test
programs by compiling with gcc option "-std=c89", then compiling again
using the modified <sys/cpuset.h>. Other "-std=" options tested too.
Addresses: https://cygwin.com/pipermail/cygwin-patches/2023q3/012308.html Fixes: 315e5fbd99ec ("Cygwin: Fix type mismatch on sys/cpuset.h") Signed-off-by: Mark Geisert <mark@maxrnd.com>
Takashi Yano [Thu, 22 Jun 2023 15:07:26 +0000 (00:07 +0900)]
Cygwin: thread: Reset _my_tls.tid if it's pthread_null in init_mainthread().
Currently, _my_tls.tid is set to pthread_null if pthread::self()
is called before pthread::init_mainthread(). As a result, pthread::
init_mainthread() does not set _my_tls.tid appropriately. Due to
this, pthread_join() fails in LDAP environment if the program is
the first program which loads cygwin1.dll.
Thomas Schwinge [Fri, 14 Apr 2023 19:26:32 +0000 (21:26 +0200)]
For GCC, newlib combined tree, newlib build-tree testing, use standard search paths
For example, for GCC/GCN target (AMD GPUs), target libraries are built
individually per supported hardware ISA ('-march=[...]'). Testing such a
toolchain via, for example:
$ make RUNTESTFLAGS='--target_board=[...]/-march=gfx90a' check[...]
... does work fine for all 'check-gcc-[...]' as well as GCC-provided target
libraries, 'check-target-[...]'. Just for 'check-target-newlib', for the
example above, not the '-march=gfx90a' newlib libraries are linked in, but
instead always the default ones, which results in link FAILure. This is cured
simply by skipping use of 'newlib/testsuite/lib/flags.exp', so that the
standard search paths as determined by GCC, DejaGnu are used for newlib, too.
Brian Inglis [Mon, 19 Jun 2023 18:15:19 +0000 (12:15 -0600)]
fhandler/proc.cc: use wincap.has_user_shstk
In test for AMD/Intel Control flow Enforcement Technology user mode
shadow stack support replace Windows version tests with test of wincap
member addition has_user_shstk with Windows version dependent value
Fixes: 41fdb869f998 ("fhandler/proc.cc(format_proc_cpuinfo): Add Linux 6.3 cpuinfo") Signed-off-by: Brian Inglis <Brian.Inglis@Shaw.ca>
Do not rely on `getenv ("HOME")`'s path conversion
In the very early code path where `dll_crt0_1 ()` calls
`user_shared->initialize ()`, the Cygwin runtime calls `internal_pwsid ()`
to initialize the user name in preparation for reading the `fstab` file.
In case `db_home: env` is defined in `/etc/nsswitch.conf`, we need to
look at the environment variable `HOME` and use it, if set.
When all of this happens, though, the `pinfo_init ()` function has had no
chance to run yet (and therefore, `environ_init ()`). At this stage,
therefore, `getenv ()`'s `findenv_func ()` call still finds `getearly ()`
and we get the _verbatim_ value of `HOME`. That is, the Windows form.
But we need the "POSIX" form.
To add insult to injury, later calls to `getpwuid (getuid ())` will
receive a cached version of the home directory via
`cygheap->pg.pwd_cache.win.find_user ()` thanks to the first
`internal_pwsid ()` call caching the result via
`add_user_from_cygserver ()`, read: we will never receive the converted
`HOME` but always the Windows variant.
So, contrary to the assumptions made in 27376c60a9 (Allow deriving the
current user's home directory via the HOME variable, 2023-03-28), we
cannot assume that `getenv ("HOME")` returned a "POSIX" path.
This is a real problem. Even setting aside that common callers of
`getpwuid ()` (such as OpenSSH) are unable to handle Windows paths in the
`pw_dir` attribute, the Windows path never makes it back to the caller
unscathed. The value returned from `fetch_home_env ()` is not actually
used as-is. Instead, the `fetch_account_from_windows ()` method uses it
to write a pseudo `/etc/passwd`-formatted line that is _then_ parsed via
the `pwdgrp::parse_passwd ()` method which sees no problem with
misinterpreting the colon after the drive letter as a field separator of
that `/etc/passwd`-formatted line, and instead of a Windows path, we now
have a mere drive letter.
Let's detect when the `HOME` value is still in Windows format in
`fetch_home_env ()`, and convert it in that case.
For good measure, interpret this "Windows format" not only to include
absolute paths with drive prefixes, but also UNC paths.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
The account under which Azure Web Apps run is an IIS APPOOL account that
is generated on the fly.
These are special because the virtual machines on which thes Apps run
are not domain-joined, yet the accounts are domain accounts.
To support the use case where such a Web App needs to call `ssh` (e.g.
to deploy from a Git repository that is accessible only via SSH), we do
need OpenSSH's `getpwuid (getuid ())` invocation to work.
But currently it does not. Concretely, `getuid ()` returns -1 for these
accounts, and OpenSSH fails to find the correct home directory
(_especially_ when that home directory was overridden via a `db_home:
env` line in `/etc/nsswitch.conf`).
This can be verified e.g. in a Kudu console (for details about Kudu
consoles, see https://github.com/projectkudu/kudu/wiki/Kudu-console):
the domain is `IIS APPPOOL`, the account name is the name of the Azure
Web App, the SID starts with 'S-1-5-82-`, and
`pwdgrp::fetch_account_from_windows()` runs into the code path where
"[...] the domain returned by LookupAccountSid is not our machine name,
and if our machine is no domain member, we lose. We have nobody to ask
for the POSIX offset."
Since these IIS APPPOOL accounts are relatively similar to AzureAD
accounts in this scenario, let's imitate the latter to support also the
former.
Reported-by: David Ebbo <david.ebbo@gmail.com> Helped-by: Corinna Vinschen <corinna@vinschen.de> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Takashi Yano [Fri, 2 Jun 2023 01:19:18 +0000 (10:19 +0900)]
Cygwin: pty: Additional fix for transferring input at exit.
The commit 9fc746d17dc3 does not fix transferring input at exit
appropriately. If the more than one non-cygwin apps are executed
simultaneously and one of them is terminated, the pty master failed
to send input to the other non-cygwin apps. This patch fixes that.
Takashi Yano [Thu, 1 Jun 2023 10:44:41 +0000 (19:44 +0900)]
Cygwin: pty: Fix transferring type-ahead input between input pipes.
After the commit e5fcc5837c95, transferring type-ahead input between
the pipe for cygwin app and the pipe for non-cygwin app will not be
done appropriately when the stdin of the non-cygwin app is not pty.
Due to this issue, sometimes the keyboard input might be lost which
should be sent to cygwin app. This patch fixes the issue.
Fixes: e5fcc5837c95 ("Cygwin: pty: Fix reading CONIN$ when stdin is not a pty.") Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
Cygwin: Adjust CWD magic to accommodate for the latest Windows previews
Reportedly Windows 11 build 25*** from Insider changed the current
working directory logic a bit, and Cygwin's "magic" (or:
"technologically sufficiently advanced") code needs to be adjusted
accordingly.
This fixes https://github.com/git-for-windows/git/issues/4429
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
git://sourceware.org / newlib-cygwin.git / log