X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=liblttng-ust%2Flttng-ust-elf.c;h=52078d9629f34df177e88857ccd82690a6fb6c4e;hb=c0c0989ab70574e09b2f7e8b48c2da6af664a849;hp=c9d2b6b3c406dcb33a8a39dfaab51af7dbe39917;hpb=e1f0c5692aa0f75c547e28efd734cc911503c4f3;p=lttng-ust.git

diff --git a/liblttng-ust/lttng-ust-elf.c b/liblttng-ust/lttng-ust-elf.c
index c9d2b6b3..52078d96 100644
--- a/liblttng-ust/lttng-ust-elf.c
+++ b/liblttng-ust/lttng-ust-elf.c
@@ -1,34 +1,31 @@
 /*
- * Copyright (C) 2015  Antoine Busque <abusque@efficios.com>
+ * SPDX-License-Identifier: LGPL-2.1-or-later
  *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ * Copyright (C) 2015 Antoine Busque <abusque@efficios.com>
  */
 
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
+#include <fcntl.h>
 #include <helper.h>
-#include <string.h>
 #include <lttng/align.h>
 #include <lttng/ust-elf.h>
-#include <sys/types.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
 #include <sys/stat.h>
-#include <fcntl.h>
+#include <sys/types.h>
 #include <unistd.h>
+
+#include <ust-fd.h>
+
 #include "lttng-tracer-core.h"
 
 #define BUF_LEN	4096
 
+#ifndef NT_GNU_BUILD_ID
+# define NT_GNU_BUILD_ID	3
+#endif
+
 /*
  * Retrieve the nth (where n is the `index` argument) phdr (program
  * header) from the given elf instance.
@@ -236,21 +233,40 @@ struct lttng_ust_elf *lttng_ust_elf_create(const char *path)
 	uint8_t e_ident[EI_NIDENT];
 	struct lttng_ust_elf_shdr *section_names_shdr;
 	struct lttng_ust_elf *elf = NULL;
+	int ret, fd;
 
 	elf = zmalloc(sizeof(struct lttng_ust_elf));
 	if (!elf) {
 		goto error;
 	}
 
+	/* Initialize fd field to -1. 0 is a valid fd number */
+	elf->fd = -1;
+
 	elf->path = strdup(path);
 	if (!elf->path) {
 		goto error;
 	}
 
-	elf->fd = open(elf->path, O_RDONLY | O_CLOEXEC);
-	if (elf->fd < 0) {
+	lttng_ust_lock_fd_tracker();
+	fd = open(elf->path, O_RDONLY | O_CLOEXEC);
+	if (fd < 0) {
+		lttng_ust_unlock_fd_tracker();
+		goto error;
+	}
+
+	ret = lttng_ust_add_fd_to_tracker(fd);
+	if (ret < 0) {
+		ret = close(fd);
+		if (ret) {
+			PERROR("close on elf->fd");
+		}
+		ret = -1;
+		lttng_ust_unlock_fd_tracker();
 		goto error;
 	}
+	elf->fd = ret;
+	lttng_ust_unlock_fd_tracker();
 
 	if (lttng_ust_read(elf->fd, e_ident, EI_NIDENT) < EI_NIDENT) {
 		goto error;
@@ -303,16 +319,7 @@ struct lttng_ust_elf *lttng_ust_elf_create(const char *path)
 	return elf;
 
 error:
-	if (elf) {
-		free(elf->ehdr);
-		if (elf->fd >= 0) {
-			if (close(elf->fd)) {
-				abort();
-			}
-		}
-		free(elf->path);
-		free(elf);
-	}
+	lttng_ust_elf_destroy(elf);
 	return NULL;
 }
 
@@ -333,14 +340,25 @@ uint8_t lttng_ust_elf_is_pic(struct lttng_ust_elf *elf)
  */
 void lttng_ust_elf_destroy(struct lttng_ust_elf *elf)
 {
+	int ret;
+
 	if (!elf) {
 		return;
 	}
 
-	free(elf->ehdr);
-	if (close(elf->fd)) {
-		abort();
+	if (elf->fd >= 0) {
+		lttng_ust_lock_fd_tracker();
+		ret = close(elf->fd);
+		if (!ret) {
+			lttng_ust_delete_fd_from_tracker(elf->fd);
+		} else {
+			PERROR("close");
+			abort();
+		}
+		lttng_ust_unlock_fd_tracker();
 	}
+
+	free(elf->ehdr);
 	free(elf->path);
 	free(elf);
 }
@@ -376,9 +394,9 @@ int lttng_ust_elf_get_memsz(struct lttng_ust_elf *elf, uint64_t *memsz)
 			goto next_loop;
 		}
 
-		low_addr = phdr->p_vaddr < low_addr ? phdr->p_vaddr : low_addr;
-		high_addr = phdr->p_vaddr + phdr->p_memsz > high_addr ?
-				phdr->p_vaddr + phdr->p_memsz : high_addr;
+		low_addr = min_t(uint64_t, low_addr, phdr->p_vaddr);
+		high_addr = max_t(uint64_t, high_addr,
+				phdr->p_vaddr + phdr->p_memsz);
 	next_loop:
 		free(phdr);
 	}
@@ -419,7 +437,7 @@ int lttng_ust_elf_get_build_id_from_segment(
 		size_t read_len;
 
 		/* Align start of note entry */
-		offset += offset_align(offset, ELF_NOTE_ENTRY_ALIGN);
+		offset += lttng_ust_offset_align(offset, ELF_NOTE_ENTRY_ALIGN);
 		if (offset >= segment_end) {
 			break;
 		}
@@ -444,7 +462,7 @@ int lttng_ust_elf_get_build_id_from_segment(
 
 		offset += sizeof(nhdr) + nhdr.n_namesz;
 		/* Align start of desc entry */
-		offset += offset_align(offset, ELF_NOTE_DESC_ALIGN);
+		offset += lttng_ust_offset_align(offset, ELF_NOTE_DESC_ALIGN);
 
 		if (nhdr.n_type != NT_GNU_BUILD_ID) {
 			/*