Hello,
tried to have a look at it.
Program received signal SIGSEGV, Segmentation fault.
0x80015110 in mount ()
(gdb) bt
#0 0x80015110 in mount ()
#1 0xb7f8ff03 in fuse_mount_sys (mnt_opts=0x800163a8 "rw,nosuid,nodev",
mo=0xbffff398,
mnt=0x80016288 "/home/benutzer/rdiff-backup-fs-test/mnt") at mount.c:499
#2 fuse_kern_mount (mountpoint=0x80016288
"/home/benutzer/rdiff-backup-fs-test/mnt", args=0xbffff550) at mount.c:607
#3 0xb7f8b89c in fuse_mount_compat25 (mountpoint=0x80016288
"/home/benutzer/rdiff-backup-fs-test/mnt", args=0xbffff550) at helper.c:488
#4 0xb7f8b908 in fuse_mount_common (mountpoint=0x80016288
"/home/benutzer/rdiff-backup-fs-test/mnt", args=args@entry=0xbffff550)
at helper.c:248
#5 0xb7f8b9de in fuse_setup_common (argc=2, argv=0xbffff5f4, op=0x80015200
<operations>, op_size=180, mountpoint=0xbffff5b4,
multithreaded=0xbffff5b8, fd=0x0, user_data=0x0, compat=0) at helper.c:298
#6 0xb7f8bb5d in fuse_main_common (argc=<optimized out>, argv=<optimized out>,
op=<optimized out>, op_size=180, user_data=0x0, compat=0)
at helper.c:363
#7 0x8000112f in run (argc=3, argv=0xbffff6d4) at rdiff-backup-fs.c:37
#8 0x80000f3b in main (argc=3, argv=0xbffff6d4) at rdiff-backup-fs.c:43
(gdb) print mount
$1 = 0x80016020 "/home/benutzer/rdiff-backup-fs-test/mnt"
It looks like the dynamic linker uses for symbol "mount"
the variable defined in rdiff-backup-fs.c instead of
the function in libc.so.6.
rdiff-backup-fs.c:
char *mount = NULL;
Later fuse_mount_sys tries to call mount and executes the
interpretes the address saved in the variable as instructions.
Attached are two patches:
- Build with debug info to make dbgsym package useful.
(Could that be made kind of a lintian check or similar?)
- Rename variable mount to mount_dir.
With these patches applied the crash does not happen anymore
and the mounted directory is browsable.
Kind regards,
Bernhard
From e075d46fe35845f175e15f36af564b632d03dafa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bernhard=20=C3=9Cbelacker?= <bernha...@mailbox.org>
Date: Wed, 19 Apr 2017 17:26:46 +0200
Subject: Build with debug information to make dbgsym package useful.
---
configure.ac | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/configure.ac b/configure.ac
index 9afba35..7f7482a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -46,11 +46,11 @@ AC_TYPE_SIZE_T
dnl checking type of system to provide proper compile and linking flags
case ${host} in
- *-*-linux-*|*-*-k*bsd*-*) AC_SUBST(CFLAGS, ["-Wall -O3 `pkg-config --cflags fuse`"])
+ *-*-linux-*|*-*-k*bsd*-*) AC_SUBST(CFLAGS, ["-Wall -g -O3 `pkg-config --cflags fuse`"])
AC_SUBST(LIBS, ["$LIBS `pkg-config --cflags --libs fuse` -lz"]);;
- *-*-bsd-*) AC_SUBST(CFLAGS, ["-Wall -O3 `pkg-config --cflags fuse`"])
+ *-*-bsd-*) AC_SUBST(CFLAGS, ["-Wall -g -O3 `pkg-config --cflags fuse`"])
AC_SUBST(LIBS, ["$LIBS `pkg-config --cflags --libs fuse` -lz"]);;
- *-*-darwin*) AC_SUBST(CFLAGS, ["-Wall -O3 `pkg-config --cflags fuse`"])
+ *-*-darwin*) AC_SUBST(CFLAGS, ["-Wall -g -O3 `pkg-config --cflags fuse`"])
AC_SUBST(LIBS, ["$LIBS `pkg-config --cflags --libs fuse` -lz"]);;
*) AC_MSG_WARN(No automatic flags for this host system; set compile/linking flags manually);;
esac
--
2.11.0
From 9a60b26d8a1e7e7240569561c96006817279b78f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bernhard=20=C3=9Cbelacker?= <bernha...@mailbox.org>
Date: Wed, 19 Apr 2017 18:05:06 +0200
Subject: Rename variable mount to mount_dir to avoid calling it as function.
Looks like the dynamic linker uses here the variable "mount" from
rdiff-backup-fs.c that gets later called by fuse library.
Program received signal SIGSEGV, Segmentation fault.
0x80015110 in mount ()
(gdb) bt
#0 0x80015110 in mount ()
#1 0xb7f8ff03 in fuse_mount_sys (mnt_opts=0x800163a8 "rw,nosuid,nodev", mo=0xbffff398,
mnt=0x80016288 "/home/benutzer/rdiff-backup-fs-test/mnt") at mount.c:499
#2 fuse_kern_mount (mountpoint=0x80016288 "/home/benutzer/rdiff-backup-fs-test/mnt", args=0xbffff550) at mount.c:607
#3 0xb7f8b89c in fuse_mount_compat25 (mountpoint=0x80016288 "/home/benutzer/rdiff-backup-fs-test/mnt", args=0xbffff550) at helper.c:488
#4 0xb7f8b908 in fuse_mount_common (mountpoint=0x80016288 "/home/benutzer/rdiff-backup-fs-test/mnt", args=args@entry=0xbffff550)
at helper.c:248
#5 0xb7f8b9de in fuse_setup_common (argc=2, argv=0xbffff5f4, op=0x80015200 <operations>, op_size=180, mountpoint=0xbffff5b4,
multithreaded=0xbffff5b8, fd=0x0, user_data=0x0, compat=0) at helper.c:298
#6 0xb7f8bb5d in fuse_main_common (argc=<optimized out>, argv=<optimized out>, op=<optimized out>, op_size=180, user_data=0x0, compat=0)
at helper.c:363
#7 0x8000112f in run (argc=3, argv=0xbffff6d4) at rdiff-backup-fs.c:37
#8 0x80000f3b in main (argc=3, argv=0xbffff6d4) at rdiff-backup-fs.c:43
(gdb) print mount
$1 = 0x80016020 "/home/benutzer/rdiff-backup-fs-test/mnt"
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=858316
---
externs.h | 2 +-
initialize.c | 2 +-
parse.c | 8 ++++----
rdiff-backup-fs.c | 4 ++--
4 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/externs.h b/externs.h
index 029dd5c..3cbe455 100644
--- a/externs.h
+++ b/externs.h
@@ -5,7 +5,7 @@
#include <fuse.h>
-extern char *mount;
+extern char *mount_dir;
// directory where data directory should be created
extern char *tmp_dir;
// directory where file system's data will be kept
diff --git a/initialize.c b/initialize.c
index 0cc1b65..be32014 100644
--- a/initialize.c
+++ b/initialize.c
@@ -5,7 +5,7 @@
void check_mount(){
- if (gpthpro(&mount) != 0)
+ if (gpthpro(&mount_dir) != 0)
fail(ERR_NO_MOUNT);
};
diff --git a/parse.c b/parse.c
index f919f7a..0fccc58 100644
--- a/parse.c
+++ b/parse.c
@@ -138,9 +138,9 @@ void parse_repo(struct file_system_info *fsinfo, int argc, char** argv, int *ind
void parse_mount(char *arg){
- if (mount != NULL)
+ if (mount_dir != NULL)
fail(ERR_PARAMETRES);
- if (gstrcpy(&mount, arg) != 0)
+ if (gstrcpy(&mount_dir, arg) != 0)
fail(-1);
};
@@ -160,12 +160,12 @@ int parse(struct file_system_info *fsinfo, int argc, char **argv){
for (i = 1; i < argc; i++){
if (isOption(argv[i]) == 1)
parse_option(fsinfo, argc, argv, &i);
- else if (mount == NULL)
+ else if (mount_dir == NULL)
parse_mount(argv[i]);
else
parse_repo(fsinfo, argc, argv, &i);
};
- if (mount == NULL)
+ if (mount_dir == NULL)
fail(ERR_NO_MOUNT);
if (fsinfo->repo_count == 0)
fail(ERR_NO_REPO);
diff --git a/rdiff-backup-fs.c b/rdiff-backup-fs.c
index c97abbb..a15014b 100644
--- a/rdiff-backup-fs.c
+++ b/rdiff-backup-fs.c
@@ -7,7 +7,7 @@
#include <fuse.h>
-char *mount = NULL;
+char *mount_dir = NULL;
char *tmp_dir = NULL;
char *data_dir = NULL;
@@ -28,7 +28,7 @@ int run(int argc, char **argv){
initialize(file_system_info);
args[0] = argv[0];
- args[1] = mount;
+ args[1] = mount_dir;
args[2] = "-d";
if (debug)
--
2.11.0
