https://bugs.kde.org/show_bug.cgi?id=486812
Bug ID: 486812
Summary: Valgrind reports read errors reading a memory area
that has been used as `sigaltstack` memory
Classification: Developer tools
Product: valgrind
Version: 3.22.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: memcheck
Assignee: jsew...@acm.org
Reporter: m...@3v1n0.net
Target Milestone: ---
# SUMMARY
Valgrind reports read errors in the stack when such memory area has been used
as `sigaltstack` memory allocation.
# STEPS TO REPRODUCE
1. Run the GLib `unix` test with --setup=valgrind
Which implies running it with this command:
/usr/bin/valgrind --tool=memcheck --error-exitcode=1 --track-origins=yes
--leak-check=full --leak-resolution=high --num-callers=50
--show-leak-kinds=definite,possible --show-error-list=yes
--suppressions=/data/GNOME/glib/tools/glib.supp
/data/GNOME/_BUILD/glib/glib/tests/unix
# OBSERVED RESULT
The test fails with these unexpected errors
==451302==
==451302== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
==451300== Invalid read of size 8
==451300== at 0x48514EB: bcmp (in
/usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==451300== by 0x10BAF9: test_signal_alternate_stack (unix.c:594)
==451300== by 0x48E123A: test_case_run (gtestutils.c:2988)
==451300== by 0x48E123A: g_test_run_suite_internal (gtestutils.c:3090)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E1711: g_test_run_suite (gtestutils.c:3189)
==451300== by 0x48E1797: g_test_run (gtestutils.c:2275)
==451300== by 0x10AAD3: main (unix.c:886)
==451300== Address 0x1ffeffd518 is on thread 1's stack
==451300== in frame #1, created by test_signal_alternate_stack (unix.c:574)
==451300==
==451300== Invalid read of size 1
==451300== at 0x48514B9: bcmp (in
/usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==451300== by 0x10BAF9: test_signal_alternate_stack (unix.c:594)
==451300== by 0x48E123A: test_case_run (gtestutils.c:2988)
==451300== by 0x48E123A: g_test_run_suite_internal (gtestutils.c:3090)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E1711: g_test_run_suite (gtestutils.c:3189)
==451300== by 0x48E1797: g_test_run (gtestutils.c:2275)
==451300== by 0x10AAD3: main (unix.c:886)
==451300== Address 0x1ffeffd598 is on thread 1's stack
==451300== in frame #1, created by test_signal_alternate_stack (unix.c:574)
==451300==
==451300== Invalid write of size 8
==451300== at 0x4851CD3: memset (in
/usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==451300== by 0x10BB30: memset (string_fortified.h:59)
==451300== by 0x10BB30: test_signal_alternate_stack (unix.c:600)
==451300== by 0x48E123A: test_case_run (gtestutils.c:2988)
==451300== by 0x48E123A: g_test_run_suite_internal (gtestutils.c:3090)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E1711: g_test_run_suite (gtestutils.c:3189)
==451300== by 0x48E1797: g_test_run (gtestutils.c:2275)
==451300== by 0x10AAD3: main (unix.c:886)
==451300== Address 0x1ffeffd518 is on thread 1's stack
==451300== in frame #1, created by test_signal_alternate_stack
(string_fortified.h:574)
==451300==
==451300== Invalid write of size 8
==451300== at 0x4851CCC: memset (in
/usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==451300== by 0x10BB30: memset (string_fortified.h:59)
==451300== by 0x10BB30: test_signal_alternate_stack (unix.c:600)
==451300== by 0x48E123A: test_case_run (gtestutils.c:2988)
==451300== by 0x48E123A: g_test_run_suite_internal (gtestutils.c:3090)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E1711: g_test_run_suite (gtestutils.c:3189)
==451300== by 0x48E1797: g_test_run (gtestutils.c:2275)
==451300== by 0x10AAD3: main (unix.c:886)
==451300== Address 0x1ffeffd520 is on thread 1's stack
==451300== in frame #1, created by test_signal_alternate_stack
(string_fortified.h:574)
==451300==
==451300== Invalid read of size 8
==451300== at 0x48514EB: bcmp (in
/usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==451300== by 0x10BCF7: test_signal_alternate_stack (unix.c:601)
==451300== by 0x48E123A: test_case_run (gtestutils.c:2988)
==451300== by 0x48E123A: g_test_run_suite_internal (gtestutils.c:3090)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E1711: g_test_run_suite (gtestutils.c:3189)
==451300== by 0x48E1797: g_test_run (gtestutils.c:2275)
==451300== by 0x10AAD3: main (unix.c:886)
==451300== Address 0x1ffeffd518 is on thread 1's stack
==451300== in frame #1, created by test_signal_alternate_stack (unix.c:574)
==451300==
==451300== Invalid read of size 8
==451300== at 0x48514EB: bcmp (in
/usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==451300== by 0x10BCA7: test_signal_alternate_stack (unix.c:607)
==451300== by 0x48E123A: test_case_run (gtestutils.c:2988)
==451300== by 0x48E123A: g_test_run_suite_internal (gtestutils.c:3090)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E1711: g_test_run_suite (gtestutils.c:3189)
==451300== by 0x48E1797: g_test_run (gtestutils.c:2275)
==451300== by 0x10AAD3: main (unix.c:886)
==451300== Address 0x1ffeffd518 is on thread 1's stack
==451300== in frame #1, created by test_signal_alternate_stack (unix.c:574)
==451300==
==451300== Invalid read of size 1
==451300== at 0x48514B9: bcmp (in
/usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==451300== by 0x10BCA7: test_signal_alternate_stack (unix.c:607)
==451300== by 0x48E123A: test_case_run (gtestutils.c:2988)
==451300== by 0x48E123A: g_test_run_suite_internal (gtestutils.c:3090)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E11B2: g_test_run_suite_internal (gtestutils.c:3109)
==451300== by 0x48E1711: g_test_run_suite (gtestutils.c:3189)
==451300== by 0x48E1797: g_test_run (gtestutils.c:2275)
==451300== by 0x10AAD3: main (unix.c:886)
==451300== Address 0x1ffeffd598 is on thread 1's stack
==451300== in frame #1, created by test_signal_alternate_stack (unix.c:574)
==451300==
**
GLib:ERROR:../../glib/glib/tests/unix.c:607:test_signal_alternate_stack:
assertion failed (stack_memory == zero_mem)
# EXPECTED RESULT
The test does not fail
---
To note that, manually looping through the stack area checking for memory
changes, also valgrind reports an error when we reach to a specific point (that
is not fixed):
Reading byte 2646
Reading byte 2647
Reading byte 2648
==46100== Invalid read of size 1
==46100== at 0x1098B4: test_signal_alternate_stack (unix.c:615)
==46100== by 0x1098B4: test_sighup_alternate_stack (unix.c:643)
==46100== by 0x48DF23A: test_case_run (gtestutils.c:2988)
==46100== by 0x48DF23A: g_test_run_suite_internal (gtestutils.c:3090)
==46100== by 0x48DF1B2: g_test_run_suite_internal (gtestutils.c:3109)
==46100== by 0x48DF1B2: g_test_run_suite_internal (gtestutils.c:3109)
==46100== by 0x48DF711: g_test_run_suite (gtestutils.c:3189)
==46100== by 0x48DF797: g_test_run (gtestutils.c:2275)
==46100== by 0x1093B8: main (unix.c:915)
==46100== Address 0x1ffeffce88 is on thread 1's stack
==46100== in frame #0, created by test_sighup_alternate_stack (unix.c:642)
==46100==
Reading byte 2649
Reading byte 2650
Reading byte 2651
As further note, the same issue happens also when using dynamically or mmap'ed
memory areas instead.
Note that no error is happening for other sanitizers (ASAN in various in
compilers), so my feeling is that this is due the way valgrind implements this.
Coming from https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4050
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