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[Bug middle-end/79234] warn on past the end reads by library functions
- From: "msebor at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 04 May 2017 23:50:54 +0000
- Subject: [Bug middle-end/79234] warn on past the end reads by library functions
- Auto-submitted: auto-generated
- References: <bug-79234-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79234
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Thu May 4 23:50:21 2017
New Revision: 247622
URL: https://gcc.gnu.org/viewcvs?rev=247622&root=gcc&view=rev
Log:
PR libstdc++/54924 - Warn for std::string constructor with wrong size
PR middle-end/79234 - warn on past the end reads by library functions
gcc/ChangeLog:
PR middle-end/79234
* builtins.c (check_sizes): Adjust to handle reading past the end.
Avoid printing excessive upper bound of ranges. Use %E to print
tree nodes instead of converting them to %wu.
(expand_builtin_memchr): New function.
(compute_dest_size): Rename...
(compute_objsize): ...to this.
(expand_builtin_memcpy): Adjust.
(expand_builtin_mempcpy): Adjust.
(expand_builtin_strcat): Adjust.
(expand_builtin_strcpy): Adjust.
(check_strncat_sizes): Adjust.
(expand_builtin_strncat): Adjust.
(expand_builtin_strncpy): Adjust and simplify.
(expand_builtin_memset): Adjust.
(expand_builtin_bzero): Adjust.
(expand_builtin_memcmp): Adjust.
(expand_builtin): Handle memcmp.
(maybe_emit_chk_warning): Check strncat just once.
gcc/testsuite/ChangeLog:
PR middle-end/79234
* gcc.dg/builtin-stringop-chk-8.c: New test.
* gcc.dg/builtin-stringop-chk-1.c: Adjust.
* gcc.dg/builtin-stringop-chk-4.c: Same.
* gcc.dg/builtin-strncat-chk-1.c: Same.
* g++.dg/ext/strncpy-chk1.C: Same.
* g++.dg/torture/Wsizeof-pointer-memaccess1.C: Same.
* gcc.dg/out-of-bounds-1.c: Same.
* gcc.dg/pr78138.c: Same.
* gcc.dg/torture/Wsizeof-pointer-memaccess1.c: Same.
* gfortran.dg/mvbits_7.f90: Same.
Added:
trunk/gcc/testsuite/gcc.dg/builtin-stringop-chk-8.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/builtins.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/ext/strncpy-chk1.C
trunk/gcc/testsuite/g++.dg/torture/Wsizeof-pointer-memaccess1.C
trunk/gcc/testsuite/gcc.dg/builtin-stringop-chk-1.c
trunk/gcc/testsuite/gcc.dg/builtin-stringop-chk-4.c
trunk/gcc/testsuite/gcc.dg/builtin-strncat-chk-1.c
trunk/gcc/testsuite/gcc.dg/out-of-bounds-1.c
trunk/gcc/testsuite/gcc.dg/pr78138.c
trunk/gcc/testsuite/gcc.dg/torture/Wsizeof-pointer-memaccess1.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-1.c
trunk/gcc/testsuite/gfortran.dg/mvbits_7.f90