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Cygwin: fork/exec: Allow all users PROCESS_QUERY_LIMITED_INFORMATION

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Create process with standard rights, plus
PROCESS_QUERY_LIMITED_INFORMATION for authenticated users.  This
allows to fetch basic process information and thus /proc/<PID>/stat
to succeed on foreign processes.

While at it, fix formatting in CreateProcess calls.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2019-03-12 11:41:35 +01:00
parent 57f1c81fb3
commit 24f9cb015e
2 changed files with 30 additions and 17 deletions
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17
winsup/cygwin/fork.cc
View File

@ -318,6 +318,13 @@ frok::parent (volatile char * volatile stack_here)
ch.silentfail (!*with_forkables); /* fail silently without forkables */ ch.silentfail (!*with_forkables); /* fail silently without forkables */
tmp_pathbuf tp;
PSECURITY_ATTRIBUTES sa = (PSECURITY_ATTRIBUTES) tp.w_get ();
if (!sec_user_nih (sa, cygheap->user.saved_sid (),
well_known_authenticated_users_sid,
PROCESS_QUERY_LIMITED_INFORMATION))
sa = &sec_none_nih;
while (1) while (1)
{ {
PCWCHAR forking_progname = NULL; PCWCHAR forking_progname = NULL;
@ -339,12 +346,12 @@ frok::parent (volatile char * volatile stack_here)
sure child stack is allocated sure child stack is allocated
in the same memory location in the same memory location
as in parent. */ as in parent. */
&sec_none_nih, sa,
&sec_none_nih, sa,
TRUE, /* inherit handles from parent */ TRUE, /* inherit handles */
c_flags, c_flags,
NULL, /* environment filled in later */ NULL, /* environ filled in later */
0, /* use current drive/directory */ 0, /* use cwd */
&si, &si,
&pi); &pi);

30
winsup/cygwin/spawn.cc
View File

@ -566,6 +566,12 @@ child_info_spawn::worker (const char *prog_arg, const char *const *argv,
SetHandleInformation (my_wr_proc_pipe, HANDLE_FLAG_INHERIT, 0); SetHandleInformation (my_wr_proc_pipe, HANDLE_FLAG_INHERIT, 0);
parent_winpid = GetCurrentProcessId (); parent_winpid = GetCurrentProcessId ();
PSECURITY_ATTRIBUTES sa = (PSECURITY_ATTRIBUTES) tp.w_get ();
if (!sec_user_nih (sa, cygheap->user.sid (),
well_known_authenticated_users_sid,
PROCESS_QUERY_LIMITED_INFORMATION))
sa = &sec_none_nih;
loop: loop:
/* When ruid != euid we create the new process under the current original /* When ruid != euid we create the new process under the current original
account and impersonate in child, this way maintaining the different account and impersonate in child, this way maintaining the different
@ -586,13 +592,13 @@ child_info_spawn::worker (const char *prog_arg, const char *const *argv,
&& !::cygheap->user.groups.issetgroups () && !::cygheap->user.groups.issetgroups ()
&& !::cygheap->user.setuid_to_restricted)) && !::cygheap->user.setuid_to_restricted))
{ {
rc = CreateProcessW (runpath, /* image name - with full path */ rc = CreateProcessW (runpath, /* image name w/ full path */
cmd.wcs (wcmd),/* what was passed to exec */ cmd.wcs (wcmd), /* what was passed to exec */
&sec_none_nih, /* process security attrs */ sa, /* process security attrs */
&sec_none_nih, /* thread security attrs */ sa, /* thread security attrs */
TRUE, /* inherit handles from parent */ TRUE, /* inherit handles */
c_flags, c_flags,
envblock, /* environment */ envblock, /* environment */
NULL, NULL,
&si, &si,
&pi); &pi);
@ -640,13 +646,13 @@ child_info_spawn::worker (const char *prog_arg, const char *const *argv,
} }
rc = CreateProcessAsUserW (::cygheap->user.primary_token (), rc = CreateProcessAsUserW (::cygheap->user.primary_token (),
runpath, /* image name - with full path */ runpath, /* image name w/ full path */
cmd.wcs (wcmd),/* what was passed to exec */ cmd.wcs (wcmd), /* what was passed to exec */
&sec_none_nih, /* process security attrs */ sa, /* process security attrs */
&sec_none_nih, /* thread security attrs */ sa, /* thread security attrs */
TRUE, /* inherit handles from parent */ TRUE, /* inherit handles */
c_flags, c_flags,
envblock, /* environment */ envblock, /* environment */
NULL, NULL,
&si, &si,
&pi); &pi);