On Wed, 06 Mar 2013 15:38:54 +0100, Richard W.M. Jones wrote: > ==11843== 56 bytes in 1 blocks are definitely lost in loss record 6 of 6 > ==11843== at 0x4A06409: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) > ==11843== by 0x38EAC861F9: strdup (strdup.c:42) > ==11843== by 0x38EC8097C9: setprocattrcon_raw.constprop.3 (procattr.c:241) > ==11843== by 0x38EC8099B7: setprocattrcon.constprop.2 (procattr.c:274) > ==11843== by 0x400955: main (in /tmp/test) > > The symbol we're actually calling is 'setsockcreatecon'. It's not a > macro. There is no public function called 'setprocattrcon' [...] On Thu, 07 Mar 2013 10:10:56 +0100, Mark Wielaard wrote: > Though note that the name we were really looking for was > setsockcreatecon, since that is what was called from main. I think that > one is doing a tail-call to setprocattrcon.constprop.2 so might not > easily be available in the backtrace. If you compile and run Richard's > reproducer from https://bugzilla.redhat.com/show_bug.cgi?id=918572 and > break at the strdup call, can you get a backtrace from gdb with > setsockcreatecon in it? Yes: (gdb) bt #0 __GI___strdup (s=0x6021e0 "unconfined_u:unconfined_r:svirt_socket_t:s0-s0:c0.c1023") at strdup.c:40 #1 0x00007ffff7bc27ca in setprocattrcon_raw (context=0x6021e0 "unconfined_u:unconfined_r:svirt_socket_t:s0-s0:c0.c1023", attr=attr@entry=0x7ffff7bd11f6 "sockcreate", pid=0) at procattr.c:241 #2 0x00007ffff7bc29b8 in setprocattrcon (context=<optimized out>, attr=attr@entry=0x7ffff7bd11f6 "sockcreate", pid=0) at procattr.c:274 #3 0x00007ffff7bc2ddc in setsockcreatecon (c=<optimized out>) at procattr.c:320 #4 0x0000000000400818 in main () at constprop.c:33 (gdb) info frame 3 Stack frame at 0x7fffffffe130: rip = 0x7ffff7bc2ddc in setsockcreatecon (procattr.c:320); saved rip 0x7ffff781ab75 tail call frame, caller of frame at 0x7fffffffe130 ^^^^^^^^^^^^^^^ source language c. Arglist at unknown address. Locals at unknown address, Previous frame's sp is 0x7fffffffe130 But one has to compile the main program with -O2 -g so that it has the needed call site debug information: gcc -Wall constprop.c -o constprop -lselinux -g -O2 <2><37e>: Abbrev Number: 21 (DW_TAG_GNU_call_site) <37f> DW_AT_low_pc : 0x400818 <387> DW_AT_abstract_origin: <0x515> <1><515>: Abbrev Number: 24 (DW_TAG_subprogram) <516> DW_AT_name : (indirect string, offset: 0x11): setsockcreatecon <520> DW_AT_declaration : 1 Jan -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
