From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 security/nss/lib/ssl/sslmutex.c | 658 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 658 insertions(+)
 create mode 100644 security/nss/lib/ssl/sslmutex.c

(limited to 'security/nss/lib/ssl/sslmutex.c')

diff --git a/security/nss/lib/ssl/sslmutex.c b/security/nss/lib/ssl/sslmutex.c
new file mode 100644
index 000000000..560a9e823
--- /dev/null
+++ b/security/nss/lib/ssl/sslmutex.c
@@ -0,0 +1,658 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "seccomon.h"
+/* This ifdef should match the one in sslsnce.c */
+#if defined(XP_UNIX) || defined(XP_WIN32) || defined(XP_OS2) || defined(XP_BEOS)
+
+#include "sslmutex.h"
+#include "prerr.h"
+
+static SECStatus
+single_process_sslMutex_Init(sslMutex* pMutex)
+{
+    PR_ASSERT(pMutex != 0 && pMutex->u.sslLock == 0);
+
+    pMutex->u.sslLock = PR_NewLock();
+    if (!pMutex->u.sslLock) {
+        return SECFailure;
+    }
+    return SECSuccess;
+}
+
+static SECStatus
+single_process_sslMutex_Destroy(sslMutex* pMutex)
+{
+    PR_ASSERT(pMutex != 0);
+    PR_ASSERT(pMutex->u.sslLock != 0);
+    if (!pMutex->u.sslLock) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+    PR_DestroyLock(pMutex->u.sslLock);
+    return SECSuccess;
+}
+
+static SECStatus
+single_process_sslMutex_Unlock(sslMutex* pMutex)
+{
+    PR_ASSERT(pMutex != 0);
+    PR_ASSERT(pMutex->u.sslLock != 0);
+    if (!pMutex->u.sslLock) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+    PR_Unlock(pMutex->u.sslLock);
+    return SECSuccess;
+}
+
+static SECStatus
+single_process_sslMutex_Lock(sslMutex* pMutex)
+{
+    PR_ASSERT(pMutex != 0);
+    PR_ASSERT(pMutex->u.sslLock != 0);
+    if (!pMutex->u.sslLock) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+    PR_Lock(pMutex->u.sslLock);
+    return SECSuccess;
+}
+
+#if defined(LINUX) || defined(AIX) || defined(BEOS) || defined(BSDI) || (defined(NETBSD) && __NetBSD_Version__ < 500000000) || defined(OPENBSD)
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include "unix_err.h"
+#include "pratom.h"
+
+#define SSL_MUTEX_MAGIC 0xfeedfd
+#define NONBLOCKING_POSTS 1 /* maybe this is faster */
+
+#if NONBLOCKING_POSTS
+
+#ifndef FNONBLOCK
+#define FNONBLOCK O_NONBLOCK
+#endif
+
+static int
+setNonBlocking(int fd, int nonBlocking)
+{
+    int flags;
+    int err;
+
+    flags = fcntl(fd, F_GETFL, 0);
+    if (0 > flags)
+        return flags;
+    if (nonBlocking)
+        flags |= FNONBLOCK;
+    else
+        flags &= ~FNONBLOCK;
+    err = fcntl(fd, F_SETFL, flags);
+    return err;
+}
+#endif
+
+SECStatus
+sslMutex_Init(sslMutex* pMutex, int shared)
+{
+    int err;
+    PR_ASSERT(pMutex);
+    pMutex->isMultiProcess = (PRBool)(shared != 0);
+    if (!shared) {
+        return single_process_sslMutex_Init(pMutex);
+    }
+    pMutex->u.pipeStr.mPipes[0] = -1;
+    pMutex->u.pipeStr.mPipes[1] = -1;
+    pMutex->u.pipeStr.mPipes[2] = -1;
+    pMutex->u.pipeStr.nWaiters = 0;
+
+    err = pipe(pMutex->u.pipeStr.mPipes);
+    if (err) {
+        nss_MD_unix_map_default_error(errno);
+        return err;
+    }
+#if NONBLOCKING_POSTS
+    err = setNonBlocking(pMutex->u.pipeStr.mPipes[1], 1);
+    if (err)
+        goto loser;
+#endif
+
+    pMutex->u.pipeStr.mPipes[2] = SSL_MUTEX_MAGIC;
+
+#if defined(LINUX) && defined(i386)
+    /* Pipe starts out empty */
+    return SECSuccess;
+#else
+    /* Pipe starts with one byte. */
+    return sslMutex_Unlock(pMutex);
+#endif
+
+loser:
+    nss_MD_unix_map_default_error(errno);
+    close(pMutex->u.pipeStr.mPipes[0]);
+    close(pMutex->u.pipeStr.mPipes[1]);
+    return SECFailure;
+}
+
+SECStatus
+sslMutex_Destroy(sslMutex* pMutex, PRBool processLocal)
+{
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Destroy(pMutex);
+    }
+    if (pMutex->u.pipeStr.mPipes[2] != SSL_MUTEX_MAGIC) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+    close(pMutex->u.pipeStr.mPipes[0]);
+    close(pMutex->u.pipeStr.mPipes[1]);
+
+    if (processLocal) {
+        return SECSuccess;
+    }
+
+    pMutex->u.pipeStr.mPipes[0] = -1;
+    pMutex->u.pipeStr.mPipes[1] = -1;
+    pMutex->u.pipeStr.mPipes[2] = -1;
+    pMutex->u.pipeStr.nWaiters = 0;
+
+    return SECSuccess;
+}
+
+#if defined(LINUX) && defined(i386)
+/* No memory barrier needed for this platform */
+
+/* nWaiters includes the holder of the lock (if any) and the number
+** threads waiting for it.  After incrementing nWaiters, if the count
+** is exactly 1, then you have the lock and may proceed.  If the
+** count is greater than 1, then you must wait on the pipe.
+*/
+
+SECStatus
+sslMutex_Unlock(sslMutex* pMutex)
+{
+    PRInt32 newValue;
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Unlock(pMutex);
+    }
+
+    if (pMutex->u.pipeStr.mPipes[2] != SSL_MUTEX_MAGIC) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+    /* Do Memory Barrier here. */
+    newValue = PR_ATOMIC_DECREMENT(&pMutex->u.pipeStr.nWaiters);
+    if (newValue > 0) {
+        int cc;
+        char c = 1;
+        do {
+            cc = write(pMutex->u.pipeStr.mPipes[1], &c, 1);
+        } while (cc < 0 && (errno == EINTR || errno == EAGAIN));
+        if (cc != 1) {
+            if (cc < 0)
+                nss_MD_unix_map_default_error(errno);
+            else
+                PORT_SetError(PR_UNKNOWN_ERROR);
+            return SECFailure;
+        }
+    }
+    return SECSuccess;
+}
+
+SECStatus
+sslMutex_Lock(sslMutex* pMutex)
+{
+    PRInt32 newValue;
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Lock(pMutex);
+    }
+
+    if (pMutex->u.pipeStr.mPipes[2] != SSL_MUTEX_MAGIC) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+    newValue = PR_ATOMIC_INCREMENT(&pMutex->u.pipeStr.nWaiters);
+    /* Do Memory Barrier here. */
+    if (newValue > 1) {
+        int cc;
+        char c;
+        do {
+            cc = read(pMutex->u.pipeStr.mPipes[0], &c, 1);
+        } while (cc < 0 && errno == EINTR);
+        if (cc != 1) {
+            if (cc < 0)
+                nss_MD_unix_map_default_error(errno);
+            else
+                PORT_SetError(PR_UNKNOWN_ERROR);
+            return SECFailure;
+        }
+    }
+    return SECSuccess;
+}
+
+#else
+
+/* Using Atomic operations requires the use of a memory barrier instruction
+** on PowerPC, Sparc, and Alpha.  NSPR's PR_Atomic functions do not perform
+** them, and NSPR does not provide a function that does them (e.g. PR_Barrier).
+** So, we don't use them on those platforms.
+*/
+
+SECStatus
+sslMutex_Unlock(sslMutex* pMutex)
+{
+    int cc;
+    char c = 1;
+
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Unlock(pMutex);
+    }
+
+    if (pMutex->u.pipeStr.mPipes[2] != SSL_MUTEX_MAGIC) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+    do {
+        cc = write(pMutex->u.pipeStr.mPipes[1], &c, 1);
+    } while (cc < 0 && (errno == EINTR || errno == EAGAIN));
+    if (cc != 1) {
+        if (cc < 0)
+            nss_MD_unix_map_default_error(errno);
+        else
+            PORT_SetError(PR_UNKNOWN_ERROR);
+        return SECFailure;
+    }
+
+    return SECSuccess;
+}
+
+SECStatus
+sslMutex_Lock(sslMutex* pMutex)
+{
+    int cc;
+    char c;
+
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Lock(pMutex);
+    }
+
+    if (pMutex->u.pipeStr.mPipes[2] != SSL_MUTEX_MAGIC) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+
+    do {
+        cc = read(pMutex->u.pipeStr.mPipes[0], &c, 1);
+    } while (cc < 0 && errno == EINTR);
+    if (cc != 1) {
+        if (cc < 0)
+            nss_MD_unix_map_default_error(errno);
+        else
+            PORT_SetError(PR_UNKNOWN_ERROR);
+        return SECFailure;
+    }
+
+    return SECSuccess;
+}
+
+#endif
+
+#elif defined(WIN32)
+
+#include "win32err.h"
+
+/* on Windows, we need to find the optimal type of locking mechanism to use
+ for the sslMutex.
+
+ There are 3 cases :
+ 1) single-process, use a PRLock, as for all other platforms
+ 2) Win95 multi-process, use a Win32 mutex
+ 3) on WINNT multi-process, use a PRLock + a Win32 mutex
+
+*/
+
+#ifdef WINNT
+
+SECStatus
+sslMutex_2LevelInit(sslMutex *sem)
+{
+    /*  the following adds a PRLock to sslMutex . This is done in each
+        process of a multi-process server and is only needed on WINNT, if
+        using fibers. We can't tell if native threads or fibers are used, so
+        we always do it on WINNT
+    */
+    PR_ASSERT(sem);
+    if (sem) {
+        /* we need to reset the sslLock in the children or the single_process init
+           function below will assert */
+        sem->u.sslLock = NULL;
+    }
+    return single_process_sslMutex_Init(sem);
+}
+
+static SECStatus
+sslMutex_2LevelDestroy(sslMutex *sem)
+{
+    return single_process_sslMutex_Destroy(sem);
+}
+
+#endif
+
+SECStatus
+sslMutex_Init(sslMutex *pMutex, int shared)
+{
+#ifdef WINNT
+    SECStatus retvalue;
+#endif
+    HANDLE hMutex;
+    SECURITY_ATTRIBUTES attributes =
+        { sizeof(SECURITY_ATTRIBUTES), NULL, TRUE };
+
+    PR_ASSERT(pMutex != 0 && (pMutex->u.sslMutx == 0 ||
+                              pMutex->u.sslMutx ==
+                                  INVALID_HANDLE_VALUE));
+
+    pMutex->isMultiProcess = (PRBool)(shared != 0);
+
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Init(pMutex);
+    }
+
+#ifdef WINNT
+    /*  we need a lock on WINNT for fibers in the parent process */
+    retvalue = sslMutex_2LevelInit(pMutex);
+    if (SECSuccess != retvalue)
+        return SECFailure;
+#endif
+
+    if (!pMutex || ((hMutex = pMutex->u.sslMutx) != 0 &&
+                    hMutex !=
+                        INVALID_HANDLE_VALUE)) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+    attributes.bInheritHandle = (shared ? TRUE : FALSE);
+    hMutex = CreateMutex(&attributes, FALSE, NULL);
+    if (hMutex == NULL) {
+        hMutex = INVALID_HANDLE_VALUE;
+        nss_MD_win32_map_default_error(GetLastError());
+        return SECFailure;
+    }
+    pMutex->u.sslMutx = hMutex;
+    return SECSuccess;
+}
+
+SECStatus
+sslMutex_Destroy(sslMutex *pMutex, PRBool processLocal)
+{
+    HANDLE hMutex;
+    int rv;
+    int retvalue = SECSuccess;
+
+    PR_ASSERT(pMutex != 0);
+    if (!pMutex) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Destroy(pMutex);
+    }
+
+/*  multi-process mode */
+#ifdef WINNT
+    /* on NT, get rid of the PRLock used for fibers within a process */
+    retvalue = sslMutex_2LevelDestroy(pMutex);
+#endif
+
+    PR_ASSERT(pMutex->u.sslMutx != 0 &&
+              pMutex->u.sslMutx != INVALID_HANDLE_VALUE);
+    if ((hMutex = pMutex->u.sslMutx) == 0 || hMutex == INVALID_HANDLE_VALUE) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+
+    rv = CloseHandle(hMutex); /* ignore error */
+    if (!processLocal && rv) {
+        pMutex->u.sslMutx = hMutex = INVALID_HANDLE_VALUE;
+    }
+    if (!rv) {
+        nss_MD_win32_map_default_error(GetLastError());
+        retvalue = SECFailure;
+    }
+    return retvalue;
+}
+
+int
+sslMutex_Unlock(sslMutex *pMutex)
+{
+    BOOL success = FALSE;
+    HANDLE hMutex;
+
+    PR_ASSERT(pMutex != 0);
+    if (!pMutex) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Unlock(pMutex);
+    }
+
+    PR_ASSERT(pMutex->u.sslMutx != 0 &&
+              pMutex->u.sslMutx != INVALID_HANDLE_VALUE);
+    if ((hMutex = pMutex->u.sslMutx) == 0 || hMutex == INVALID_HANDLE_VALUE) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+    success = ReleaseMutex(hMutex);
+    if (!success) {
+        nss_MD_win32_map_default_error(GetLastError());
+        return SECFailure;
+    }
+#ifdef WINNT
+    return single_process_sslMutex_Unlock(pMutex);
+/* release PRLock for other fibers in the process */
+#else
+    return SECSuccess;
+#endif
+}
+
+int
+sslMutex_Lock(sslMutex *pMutex)
+{
+    HANDLE hMutex;
+    DWORD event;
+    DWORD lastError;
+    SECStatus rv;
+    SECStatus retvalue = SECSuccess;
+
+    PR_ASSERT(pMutex != 0);
+    if (!pMutex) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure;
+    }
+
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Lock(pMutex);
+    }
+#ifdef WINNT
+    /* lock first to preserve from other threads/fibers in the same process */
+    retvalue = single_process_sslMutex_Lock(pMutex);
+#endif
+    PR_ASSERT(pMutex->u.sslMutx != 0 &&
+              pMutex->u.sslMutx != INVALID_HANDLE_VALUE);
+    if ((hMutex = pMutex->u.sslMutx) == 0 || hMutex == INVALID_HANDLE_VALUE) {
+        PORT_SetError(PR_INVALID_ARGUMENT_ERROR);
+        return SECFailure; /* what else ? */
+    }
+    /* acquire the mutex to be the only owner accross all other processes */
+    event = WaitForSingleObject(hMutex, INFINITE);
+    switch (event) {
+        case WAIT_OBJECT_0:
+        case WAIT_ABANDONED:
+            rv = SECSuccess;
+            break;
+
+        case WAIT_TIMEOUT:
+#if defined(WAIT_IO_COMPLETION)
+        case WAIT_IO_COMPLETION:
+#endif
+        default: /* should never happen. nothing we can do. */
+            PR_ASSERT(!("WaitForSingleObject returned invalid value."));
+            PORT_SetError(PR_UNKNOWN_ERROR);
+            rv = SECFailure;
+            break;
+
+        case WAIT_FAILED: /* failure returns this */
+            rv = SECFailure;
+            lastError = GetLastError(); /* for debugging */
+            nss_MD_win32_map_default_error(lastError);
+            break;
+    }
+
+    if (!(SECSuccess == retvalue && SECSuccess == rv)) {
+        return SECFailure;
+    }
+
+    return SECSuccess;
+}
+
+#elif defined(XP_UNIX) && !defined(DARWIN)
+
+#include <errno.h>
+#include "unix_err.h"
+
+SECStatus
+sslMutex_Init(sslMutex* pMutex, int shared)
+{
+    int rv;
+    PR_ASSERT(pMutex);
+    pMutex->isMultiProcess = (PRBool)(shared != 0);
+    if (!shared) {
+        return single_process_sslMutex_Init(pMutex);
+    }
+    do {
+        rv = sem_init(&pMutex->u.sem, shared, 1);
+    } while (rv < 0 && errno == EINTR);
+    if (rv < 0) {
+        nss_MD_unix_map_default_error(errno);
+        return SECFailure;
+    }
+    return SECSuccess;
+}
+
+SECStatus
+sslMutex_Destroy(sslMutex* pMutex, PRBool processLocal)
+{
+    int rv;
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Destroy(pMutex);
+    }
+
+    /* semaphores are global resources. See SEM_DESTROY(3) man page */
+    if (processLocal) {
+        return SECSuccess;
+    }
+    do {
+        rv = sem_destroy(&pMutex->u.sem);
+    } while (rv < 0 && errno == EINTR);
+    if (rv < 0) {
+        nss_MD_unix_map_default_error(errno);
+        return SECFailure;
+    }
+    return SECSuccess;
+}
+
+SECStatus
+sslMutex_Unlock(sslMutex* pMutex)
+{
+    int rv;
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Unlock(pMutex);
+    }
+    do {
+        rv = sem_post(&pMutex->u.sem);
+    } while (rv < 0 && errno == EINTR);
+    if (rv < 0) {
+        nss_MD_unix_map_default_error(errno);
+        return SECFailure;
+    }
+    return SECSuccess;
+}
+
+SECStatus
+sslMutex_Lock(sslMutex* pMutex)
+{
+    int rv;
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Lock(pMutex);
+    }
+    do {
+        rv = sem_wait(&pMutex->u.sem);
+    } while (rv < 0 && errno == EINTR);
+    if (rv < 0) {
+        nss_MD_unix_map_default_error(errno);
+        return SECFailure;
+    }
+    return SECSuccess;
+}
+
+#else
+
+SECStatus
+sslMutex_Init(sslMutex* pMutex, int shared)
+{
+    PR_ASSERT(pMutex);
+    pMutex->isMultiProcess = (PRBool)(shared != 0);
+    if (!shared) {
+        return single_process_sslMutex_Init(pMutex);
+    }
+    PORT_Assert(!("sslMutex_Init not implemented for multi-process applications !"));
+    PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
+    return SECFailure;
+}
+
+SECStatus
+sslMutex_Destroy(sslMutex* pMutex, PRBool processLocal)
+{
+    PR_ASSERT(pMutex);
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Destroy(pMutex);
+    }
+    PORT_Assert(!("sslMutex_Destroy not implemented for multi-process applications !"));
+    PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
+    return SECFailure;
+}
+
+SECStatus
+sslMutex_Unlock(sslMutex* pMutex)
+{
+    PR_ASSERT(pMutex);
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Unlock(pMutex);
+    }
+    PORT_Assert(!("sslMutex_Unlock not implemented for multi-process applications !"));
+    PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
+    return SECFailure;
+}
+
+SECStatus
+sslMutex_Lock(sslMutex* pMutex)
+{
+    PR_ASSERT(pMutex);
+    if (PR_FALSE == pMutex->isMultiProcess) {
+        return single_process_sslMutex_Lock(pMutex);
+    }
+    PORT_Assert(!("sslMutex_Lock not implemented for multi-process applications !"));
+    PORT_SetError(PR_NOT_IMPLEMENTED_ERROR);
+    return SECFailure;
+}
+
+#endif
+
+#endif
-- 
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