diff options
Diffstat (limited to 'src/3rdparty/pcre2/src/sljit/allocator_src/sljitProtExecAllocatorPosix.c')
| -rw-r--r-- | src/3rdparty/pcre2/src/sljit/allocator_src/sljitProtExecAllocatorPosix.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/src/3rdparty/pcre2/src/sljit/allocator_src/sljitProtExecAllocatorPosix.c b/src/3rdparty/pcre2/src/sljit/allocator_src/sljitProtExecAllocatorPosix.c new file mode 100644 index 0000000000..f7cb6c5670 --- /dev/null +++ b/src/3rdparty/pcre2/src/sljit/allocator_src/sljitProtExecAllocatorPosix.c @@ -0,0 +1,172 @@ +/* + * Stack-less Just-In-Time compiler + * + * Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, are + * permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, this list of + * conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright notice, this list + * of conditions and the following disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT + * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED + * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#define SLJIT_HAS_CHUNK_HEADER +#define SLJIT_HAS_EXECUTABLE_OFFSET + +struct sljit_chunk_header { + void *executable; +}; + +#include <sys/stat.h> +#include <fcntl.h> +#include <stdio.h> +#include <string.h> + +#ifndef O_NOATIME +#define O_NOATIME 0 +#endif + +/* this is a linux extension available since kernel 3.11 */ +#ifndef O_TMPFILE +#define O_TMPFILE 0x404000 +#endif + +#ifndef _GNU_SOURCE +char *secure_getenv(const char *name); +int mkostemp(char *template, int flags); +#endif + +static SLJIT_INLINE int create_tempfile(void) +{ + int fd; + char tmp_name[256]; + size_t tmp_name_len = 0; + char *dir; + struct stat st; +#if defined(SLJIT_SINGLE_THREADED) && SLJIT_SINGLE_THREADED + mode_t mode; +#endif + +#ifdef HAVE_MEMFD_CREATE + /* this is a GNU extension, make sure to use -D_GNU_SOURCE */ + fd = memfd_create("sljit", MFD_CLOEXEC); + if (fd != -1) { + fchmod(fd, 0); + return fd; + } +#endif + + dir = secure_getenv("TMPDIR"); + + if (dir) { + size_t len = strlen(dir); + if (len > 0 && len < sizeof(tmp_name)) { + if ((stat(dir, &st) == 0) && S_ISDIR(st.st_mode)) { + memcpy(tmp_name, dir, len + 1); + tmp_name_len = len; + } + } + } + +#ifdef P_tmpdir + if (!tmp_name_len) { + tmp_name_len = strlen(P_tmpdir); + if (tmp_name_len > 0 && tmp_name_len < sizeof(tmp_name)) + strcpy(tmp_name, P_tmpdir); + } +#endif + if (!tmp_name_len) { + strcpy(tmp_name, "/tmp"); + tmp_name_len = 4; + } + + SLJIT_ASSERT(tmp_name_len > 0 && tmp_name_len < sizeof(tmp_name)); + + if (tmp_name_len > 1 && tmp_name[tmp_name_len - 1] == '/') + tmp_name[--tmp_name_len] = '\0'; + + fd = open(tmp_name, O_TMPFILE | O_EXCL | O_RDWR | O_NOATIME | O_CLOEXEC, 0); + if (fd != -1) + return fd; + + if (tmp_name_len >= sizeof(tmp_name) - 7) + return -1; + + strcpy(tmp_name + tmp_name_len, "/XXXXXX"); +#if defined(SLJIT_SINGLE_THREADED) && SLJIT_SINGLE_THREADED + mode = umask(0777); +#endif + fd = mkostemp(tmp_name, O_CLOEXEC | O_NOATIME); +#if defined(SLJIT_SINGLE_THREADED) && SLJIT_SINGLE_THREADED + umask(mode); +#else + fchmod(fd, 0); +#endif + + if (fd == -1) + return -1; + + if (unlink(tmp_name)) { + close(fd); + return -1; + } + + return fd; +} + +static SLJIT_INLINE struct sljit_chunk_header* alloc_chunk(sljit_uw size) +{ + struct sljit_chunk_header *retval; + int fd; + + fd = create_tempfile(); + if (fd == -1) + return NULL; + + if (ftruncate(fd, (off_t)size)) { + close(fd); + return NULL; + } + + retval = (struct sljit_chunk_header *)mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + + if (retval == MAP_FAILED) { + close(fd); + return NULL; + } + + retval->executable = mmap(NULL, size, PROT_READ | PROT_EXEC, MAP_SHARED, fd, 0); + + if (retval->executable == MAP_FAILED) { + munmap((void *)retval, size); + close(fd); + return NULL; + } + + close(fd); + return retval; +} + +static SLJIT_INLINE void free_chunk(void *chunk, sljit_uw size) +{ + struct sljit_chunk_header *header = ((struct sljit_chunk_header *)chunk) - 1; + + munmap(header->executable, size); + munmap((void *)header, size); +} + +#include "sljitExecAllocatorCore.c" |