https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115965
Bug ID: 115965
Summary: Stack smashing depending on order of declaration
Product: gcc
Version: 14.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: nathan.teodosio at canonical dot com
Target Milestone: ---
If I execute the binary I get
--->
% ./e
*** stack smashing detected ***: terminated
Aborted (core dumped)
<---
However, no error is raised if I swap lines 17 (where a and b are declared) and
18 (where c is declared), or if I move either a or b definition to after c.
Valgrind says:
--->
% valgrind -s --track-origins=yes --leak-check=full --show-leak-kinds=all ./e
==173999== Memcheck, a memory error detector
==173999== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==173999== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info
==173999== Command: ./e
==173999==
==173999== Conditional jump or move depends on uninitialised value(s)
==173999== at 0x1092FA: main (in /tmp/e)
==173999== Uninitialised value was created by a stack allocation
==173999== at 0x109244: main (in /tmp/e)
==173999==
*** stack smashing detected ***: terminated
==173999==
==173999== Process terminating with default action of signal 6 (SIGABRT):
dumping core
==173999== at 0x4928B1C: __pthread_kill_implementation (pthread_kill.c:44)
==173999== by 0x4928B1C: __pthread_kill_internal (pthread_kill.c:78)
==173999== by 0x4928B1C: pthread_kill@@GLIBC_2.34 (pthread_kill.c:89)
==173999== by 0x48CF26D: raise (raise.c:26)
==173999== by 0x48B28FE: abort (abort.c:79)
==173999== by 0x48B37B5: __libc_message_impl.cold (libc_fatal.c:132)
==173999== by 0x49C0C18: __fortify_fail (fortify_fail.c:24)
==173999== by 0x49C1EA3: __stack_chk_fail (stack_chk_fail.c:24)
==173999== by 0x109300: main (in /tmp/e)
==173999==
==173999== HEAP SUMMARY:
==173999== in use at exit: 0 bytes in 0 blocks
==173999== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==173999==
==173999== All heap blocks were freed -- no leaks are possible
==173999==
==173999== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
==173999==
==173999== 1 errors in context 1 of 1:
==173999== Conditional jump or move depends on uninitialised value(s)
==173999== at 0x1092FA: main (in /tmp/e)
==173999== Uninitialised value was created by a stack allocation
==173999== at 0x109244: main (in /tmp/e)
==173999==
==173999== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
Aborted (core dumped)
<---
