ccx-vuln-remed-126

Input

{
  "command": "ls /workspace/ && ls /workspace/gcc-mirror 2>/dev/null | head",
  "description": "List workspace contents"
}

Output

{
  "stdout": "gcc--96dfb333\nllvm-project--a8f3c97d",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "command": "ls /workspace/gcc--96dfb333 | head -20",
  "description": "List gcc repo top-level"
}

Output

{
  "stdout": "ABOUT-NLS\nCOPYING\nCOPYING.LIB\nCOPYING.RUNTIME\nCOPYING3\nCOPYING3.LIB\nChangeLog\nChangeLog.jit\nChangeLog.tree-ssa\nINSTALL\nMAINTAINERS\nMakefile.def\nMakefile.in\nMakefile.tpl\nREADME\nSECURITY.txt\nar-lib\nc++tools\ncompile\nconfig",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "command": "grep -n \"stack_clash_protection\" /workspace/gcc--96dfb333/gcc/config/i386/i386.cc | head -20",
  "description": "Find stack clash references in i386.cc"
}

Output

{
  "stdout": "6938:  if (flag_stack_clash_protection)\n6940:\t    << param_stack_clash_protection_probe_interval);\n6992:\t  || (flag_stack_clash_protection\n8289:  else if (size < (1 << param_stack_clash_protection_guard_size))\n9491:      && flag_stack_clash_protection",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "command": "grep -n \"anti_adjust_stack_and_probe\" /workspace/gcc--96dfb333/gcc/explow.cc | head",
  "description": "Find anti_adjust_stack_and_probe in explow.cc"
}

Output

{
  "stdout": "1644:\tanti_adjust_stack_and_probe (size, false);\n1646:\tanti_adjust_stack_and_probe_stack_clash (size);\n2053:   This is subtly different than anti_adjust_stack_and_probe to try and\n2063:     2. It never skips probes, whereas anti_adjust_stack_and_probe will\n2072:anti_adjust_stack_and_probe_stack_clash (rtx size)\n2201:anti_adjust_stack_and_probe (rtx size, bool adjust_back)",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "command": "grep -rn \"TARGET_STACK_CLASH_PROTECTION\" /workspace/gcc--96dfb333/gcc --include=\"*.h\" | head; echo ---; grep -rln \"stack_clash\" /workspace/gcc--96dfb333/gcc/config/i386/*.h /workspace/gcc--96dfb333/gcc/*.h 2>/dev/null | head",
  "description": "Search headers for TARGET_STACK_CLASH_PROTECTION"
}

Output

{
  "stdout": "---\n/workspace/gcc--96dfb333/gcc/explow.h\n/workspace/gcc--96dfb333/gcc/function.h\n/workspace/gcc--96dfb333/gcc/targhooks.h",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "command": "ls /workspace/gcc--96dfb333/gcc/testsuite/gcc.target/i386/stack-clash-* 2>/dev/null; echo ---; grep -n \"fstack-clash-protection\" /workspace/gcc--96dfb333/gcc/common.opt",
  "description": "Find i386 stack-clash tests and common.opt entry"
}

Output

{
  "stdout": "/workspace/gcc--96dfb333/gcc/testsuite/gcc.target/i386/stack-clash-protection.c\n---\n3054:fstack-clash-protection",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "command": "grep -rn \"TARGET_STACK_CLASH_PROTECTION\" /workspace/gcc--96dfb333/gcc/*.h /workspace/gcc--96dfb333/gcc/*.def /workspace/gcc--96dfb333/gcc/config/i386/ 2>/dev/null | head; echo ---; grep -n \"stack_clash\" /workspace/gcc--96dfb333/gcc/explow.h /workspace/gcc--96dfb333/gcc/function.h /workspace/gcc--96dfb333/gcc/targhooks.h",
  "description": "Locate TARGET_STACK_CLASH_PROTECTION declaration"
}

Output

{
  "stdout": "---\n/workspace/gcc--96dfb333/gcc/function.h:640:enum stack_clash_probes {\n/workspace/gcc--96dfb333/gcc/function.h:647:extern void dump_stack_clash_frame_info (enum stack_clash_probes, bool);\n/workspace/gcc--96dfb333/gcc/targhooks.h:305:extern HOST_WIDE_INT default_stack_clash_protection_alloca_probe_range (void);\n/workspace/gcc--96dfb333/gcc/explow.h:78:extern void anti_adjust_stack_and_probe_stack_clash (rtx);\n/workspace/gcc--96dfb333/gcc/explow.h:82:extern void compute_stack_clash_protection_loop_data (rtx *, rtx *, rtx *,\n/workspace/gcc--96dfb333/gcc/explow.h:84:extern void emit_stack_clash_protection_probe_loop_start (rtx *, rtx *,\n/workspace/gcc--96dfb333/gcc/explow.h:86:extern void emit_stack_clash_protection_probe_loop_end (rtx, rtx,",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "command": "grep -rn \"STACK_CLASH_PROTECTION\" /workspace/gcc--96dfb333/gcc/target.def /workspace/gcc--96dfb333/gcc/defaults.h 2>/dev/null | head; echo ---; grep -rln \"TARGET_STACK_CLASH_PROTECTION\" /workspace/gcc--96dfb333/gcc --include=\"*.h\" --include=\"*.def\" --include=\"*.texi\" 2>/dev/null | head",
  "description": "Search target.def and docs for the hook"
}

Output

{
  "stdout": "---\n/workspace/gcc--96dfb333/gcc/doc/tm.texi",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "command": "grep -n \"TARGET_STACK_CLASH_PROTECTION\" /workspace/gcc--96dfb333/gcc/doc/tm.texi | head; echo ---; grep -rn \"stack_clash\" /workspace/gcc--96dfb333/gcc/target.def | head; echo ---; ls /workspace/gcc--96dfb333/gcc/doc/tm.texi.in 2>/dev/null && grep -n \"STACK_CLASH\" /workspace/gcc--96dfb333/gcc/doc/tm.texi.in | head",
  "description": "Inspect tm.texi and target.def for stack clash hook"
}

Output

{
  "stdout": "3772:@deftypefn {Target Hook} HOST_WIDE_INT TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE (void)\n---\n/workspace/gcc--96dfb333/gcc/target.def:6535:(stack_clash_protection_alloca_probe_range,\n/workspace/gcc--96dfb333/gcc/target.def:6545: default_stack_clash_protection_alloca_probe_range)\n---\n/workspace/gcc--96dfb333/gcc/doc/tm.texi.in\n2998:@hook TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "command": "sed -n 6900,6945p /workspace/gcc--96dfb333/gcc/config/i386/i386.cc; echo ====; grep -n \"^ix86_adjust_stack_and_probe\\|^ix86_emit_probe_stack_range\\|static void.*probe\" /workspace/gcc--96dfb333/gcc/config/i386/i386.cc | head",
  "description": "View stack clash code in i386.cc"
}

Output

{
  "stdout": "{\n  struct ix86_frame &frame = cfun->machine->frame;\n\n  if (from == ARG_POINTER_REGNUM && to == HARD_FRAME_POINTER_REGNUM)\n    return frame.hard_frame_pointer_offset;\n  else if (from == FRAME_POINTER_REGNUM\n\t   && to == HARD_FRAME_POINTER_REGNUM)\n    return frame.hard_frame_pointer_offset - frame.frame_pointer_offset;\n  else\n    {\n      gcc_assert (to == STACK_POINTER_REGNUM);\n\n      if (from == ARG_POINTER_REGNUM)\n\treturn frame.stack_pointer_offset;\n\n      gcc_assert (from == FRAME_POINTER_REGNUM);\n      return frame.stack_pointer_offset - frame.frame_pointer_offset;\n    }\n}\n\n/* Emits a warning for unsupported msabi to sysv pro/epilogues.  */\nvoid\nwarn_once_call_ms2sysv_xlogues (const char *feature)\n{\n  static bool warned_once = false;\n  if (!warned_once)\n    {\n      warning (0, \"%<-mcall-ms2sysv-xlogues%> is not compatible with %s\",\n\t       feature);\n      warned_once = true;\n    }\n}\n\n/* Return the probing interval for -fstack-clash-protection.  */\n\nstatic HOST_WIDE_INT\nget_probe_interval (void)\n{\n  if (flag_stack_clash_protection)\n    return (HOST_WIDE_INT_1U\n\t    << param_stack_clash_protection_probe_interval);\n  else\n    return (HOST_WIDE_INT_1U << STACK_CHECK_PROBE_INTERVAL_EXP);\n}\n\n/* When using -fsplit-stack, the allocation routines set a field in\n====\n8215:ix86_adjust_stack_and_probe (HOST_WIDE_INT size,\n8463:ix86_emit_probe_stack_range (HOST_WIDE_INT first, HOST_WIDE_INT size,",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "command": "head -20 /workspace/gcc--96dfb333/gcc/testsuite/gcc.target/i386/stack-clash-protection.c; echo ====; sed -n 3050,3060p /workspace/gcc--96dfb333/gcc/common.opt; echo ====; grep -rn \"stack_clash\" /workspace/gcc--96dfb333/gcc/defaults.h /workspace/gcc--96dfb333/gcc/flag-types.h /workspace/gcc--96dfb333/gcc/params.opt 2>/dev/null | head",
  "description": "Check test file, common.opt, and params"
}

Output

{
  "stdout": "/* { dg-do compile } */\n/* { dg-options \"-O2 -fstack-clash-protection\" } */\n\nint flag;\nvoid open();\nint getChar();\ntypedef enum { QUOTE } CharType;\ntypedef enum { UNQ } State;\nCharType getCharType();\nvoid expand() {\n  open();\n  if (flag)\n    return;\n  int ch = getChar();\n  State nextState = getCharType();\n  if (nextState)\n    while (ch)\n      ;\n}\n====\nfstack-check\nCommon Alias(fstack-check=, specific, no)\nInsert stack checking code into the program.  Same as -fstack-check=specific.\n\nfstack-clash-protection\nCommon Var(flag_stack_clash_protection) Optimization\nInsert code to probe each page of stack space as it is allocated to protect\nfrom stack-clash style attacks.\n\n; The real option is fno-stack-limit.\nfstack-limit\n====\n/workspace/gcc--96dfb333/gcc/params.opt:1109:Common Joined UInteger Var(param_stack_clash_protection_guard_size) Init(12) IntegerRange(12, 30) Param Optimization\n/workspace/gcc--96dfb333/gcc/params.opt:1113:Common Joined UInteger Var(param_stack_clash_protection_probe_interval) Init(12) IntegerRange(10, 16) Param Optimization",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "command": "grep -n \"default_stack_clash_protection_alloca_probe_range\" /workspace/gcc--96dfb333/gcc/targhooks.cc; sed -n 6530,6546p /workspace/gcc--96dfb333/gcc/target.def",
  "description": "Confirm hook definition and default implementation"
}

Output

{
  "stdout": "2747:default_stack_clash_protection_alloca_probe_range (void)\nthese registers when the target switches are opposed to them.)\",\n void, (void),\n hook_void_void)\n\nDEFHOOK\n(stack_clash_protection_alloca_probe_range,\n \"Some targets have an ABI defined interval for which no probing needs to be done.\\n\\\nWhen a probe does need to be done this same interval is used as the probe distance\\n\\\nup when doing stack clash protection for alloca.\\n\\\nOn such targets this value can be set to override the default probing up interval.\\n\\\nDefine this variable to return nonzero if such a probe range is required or zero otherwise.\\n\\\nDefining this hook also requires your functions which make use of alloca to have at least 8 byes\\n\\\nof outgoing arguments.  If this is not the case the stack will be corrupted.\\n\\\nYou need not define this macro if it would always have the value zero.\",\n HOST_WIDE_INT, (void),\n default_stack_clash_protection_alloca_probe_range)",
  "stderr": "",
  "interrupted": false,
  "isImage": false,
  "noOutputExpected": false
}

Input

{
  "file_path": "/workspace/answer.json",
  "content": "{\n  \"files\": [\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/config/i386/i386.cc\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.cc\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.h\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/target.def\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/targhooks.h\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/targhooks.cc\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/testsuite/gcc.target/i386/stack-clash-protection.c\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/common.opt\"}\n  ],\n  \"symbols\": [\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/config/i386/i386.cc\", \"symbol\": \"ix86_adjust_stack_and_probe\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/config/i386/i386.cc\", \"symbol\": \"ix86_emit_probe_stack_range\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/config/i386/i386.cc\", \"symbol\": \"get_probe_interval\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.cc\", \"symbol\": \"anti_adjust_stack_and_probe_stack_clash\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.cc\", \"symbol\": \"anti_adjust_stack_and_probe\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.h\", \"symbol\": \"anti_adjust_stack_and_probe_stack_clash\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/target.def\", \"symbol\": \"TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/targhooks.h\", \"symbol\": \"default_stack_clash_protection_alloca_probe_range\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/targhooks.cc\", \"symbol\": \"default_stack_clash_protection_alloca_probe_range\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/common.opt\", \"symbol\": \"fstack-clash-protection\"}\n  ],\n  \"chain\": [\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/common.opt\", \"symbol\": \"fstack-clash-protection\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.cc\", \"symbol\": \"anti_adjust_stack_and_probe_stack_clash\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/config/i386/i386.cc\", \"symbol\": \"ix86_adjust_stack_and_probe\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/target.def\", \"symbol\": \"TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE\"}\n  ],\n  \"text\": \"Audit of GCC's stack clash protection implementation (repo gcc-mirror/gcc, checked out at /workspace/gcc--96dfb333). (1) x86_64 target probing: gcc/config/i386/i386.cc — ix86_adjust_stack_and_probe (line ~8215) emits the stack-clash probing sequence in the prologue, consulting flag_stack_clash_protection and param_stack_clash_protection_guard_size/probe_interval; get_probe_interval (line ~6937) returns the probing interval for -fstack-clash-protection, and ix86_emit_probe_stack_range (line ~8463) emits explicit probe ranges. (2) Generic expansion: gcc/explow.cc — anti_adjust_stack_and_probe_stack_clash (line 2072) implements the generic stack-clash-safe allocation/probe loop used by allocate_dynamic_stack_space (dispatched at lines 1644-1646), alongside the older anti_adjust_stack_and_probe (line 2201); these are declared in gcc/explow.h together with the probe-loop helpers (compute_stack_clash_protection_loop_data, emit_stack_clash_protection_probe_loop_start/end). (3) The TARGET_STACK_CLASH_PROTECTION hook: the target hook is TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE, defined via DEFHOOK(stack_clash_protection_alloca_probe_range, ...) in gcc/target.def (line 6535); its default implementation default_stack_clash_protection_alloca_probe_range is declared in gcc/targhooks.h (line 305) and defined in gcc/targhooks.cc (line 2747). No standalone TARGET_STACK_CLASH_PROTECTION macro exists in headers — the hook above is the canonical declaration (documented in gcc/doc/tm.texi). (4) Test: gcc/testsuite/gcc.target/i386/stack-clash-protection.c 
...

Output

{
  "type": "create",
  "filePath": "/workspace/answer.json",
  "content": "{\n  \"files\": [\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/config/i386/i386.cc\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.cc\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.h\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/target.def\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/targhooks.h\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/targhooks.cc\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/testsuite/gcc.target/i386/stack-clash-protection.c\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/common.opt\"}\n  ],\n  \"symbols\": [\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/config/i386/i386.cc\", \"symbol\": \"ix86_adjust_stack_and_probe\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/config/i386/i386.cc\", \"symbol\": \"ix86_emit_probe_stack_range\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/config/i386/i386.cc\", \"symbol\": \"get_probe_interval\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.cc\", \"symbol\": \"anti_adjust_stack_and_probe_stack_clash\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.cc\", \"symbol\": \"anti_adjust_stack_and_probe\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.h\", \"symbol\": \"anti_adjust_stack_and_probe_stack_clash\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/target.def\", \"symbol\": \"TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/targhooks.h\", \"symbol\": \"default_stack_clash_protection_alloca_probe_range\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/targhooks.cc\", \"symbol\": \"default_stack_clash_protection_alloca_probe_range\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/common.opt\", \"symbol\": \"fstack-clash-protection\"}\n  ],\n  \"chain\": [\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/common.opt\", \"symbol\": \"fstack-clash-protection\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/explow.cc\", \"symbol\": \"anti_adjust_stack_and_probe_stack_clash\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/config/i386/i386.cc\", \"symbol\": \"ix86_adjust_stack_and_probe\"},\n    {\"repo\": \"gcc-mirror/gcc\", \"path\": \"gcc/target.def\", \"symbol\": \"TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE\"}\n  ],\n  \"text\": \"Audit of GCC's stack clash protection implementation (repo gcc-mirror/gcc, checked out at /workspace/gcc--96dfb333). (1) x86_64 target probing: gcc/config/i386/i386.cc — ix86_adjust_stack_and_probe (line ~8215) emits the stack-clash probing sequence in the prologue, consulting flag_stack_clash_protection and param_stack_clash_protection_guard_size/probe_interval; get_probe_interval (line ~6937) returns the probing interval for -fstack-clash-protection, and ix86_emit_probe_stack_range (line ~8463) emits explicit probe ranges. (2) Generic expansion: gcc/explow.cc — anti_adjust_stack_and_probe_stack_clash (line 2072) implements the generic stack-clash-safe allocation/probe loop used by allocate_dynamic_stack_space (dispatched at lines 1644-1646), alongside the older anti_adjust_stack_and_probe (line 2201); these are declared in gcc/explow.h together with the probe-loop helpers (compute_stack_clash_protection_loop_data, emit_stack_clash_protection_probe_loop_start/end). (3) The TARGET_STACK_CLASH_PROTECTION hook: the target hook is TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE, defined via DEFHOOK(stack_clash_protection_alloca_probe_range, ...) in gcc/target.def (line 6535); its default implementation default_stack_clash_protection_alloca_probe_range is declared in gcc/targhooks.h (line 305) and defined in gcc/targhooks.cc (line 2747). No standalone TARGET_STACK_CLASH_PROTECTION macro exists in headers — the hook above is the canonical declaration (documented in gcc/doc/tm.texi). (4) Test: gcc/testsuite/gcc.target/i386/stack-
...

{
  "files": [
    {"repo": "gcc-mirror/gcc", "path": "gcc/config/i386/i386.cc"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/explow.cc"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/explow.h"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/target.def"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/targhooks.h"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/targhooks.cc"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/testsuite/gcc.target/i386/stack-clash-protection.c"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/common.opt"}
  ],
  "symbols": [
    {"repo": "gcc-mirror/gcc", "path": "gcc/config/i386/i386.cc", "symbol": "ix86_adjust_stack_and_probe"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/config/i386/i386.cc", "symbol": "ix86_emit_probe_stack_range"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/config/i386/i386.cc", "symbol": "get_probe_interval"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/explow.cc", "symbol": "anti_adjust_stack_and_probe_stack_clash"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/explow.cc", "symbol": "anti_adjust_stack_and_probe"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/explow.h", "symbol": "anti_adjust_stack_and_probe_stack_clash"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/target.def", "symbol": "TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/targhooks.h", "symbol": "default_stack_clash_protection_alloca_probe_range"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/targhooks.cc", "symbol": "default_stack_clash_protection_alloca_probe_range"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/common.opt", "symbol": "fstack-clash-protection"}
  ],
  "chain": [
    {"repo": "gcc-mirror/gcc", "path": "gcc/common.opt", "symbol": "fstack-clash-protection"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/explow.cc", "symbol": "anti_adjust_stack_and_probe_stack_clash"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/config/i386/i386.cc", "symbol": "ix86_adjust_stack_and_probe"},
    {"repo": "gcc-mirror/gcc", "path": "gcc/target.def", "symbol": "TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE"}
  ],
  "text": "Audit of GCC's stack clash protection implementation (repo gcc-mirror/gcc, checked out at /workspace/gcc--96dfb333). (1) x86_64 target probing: gcc/config/i386/i386.cc — ix86_adjust_stack_and_probe (line ~8215) emits the stack-clash probing sequence in the prologue, consulting flag_stack_clash_protection and param_stack_clash_protection_guard_size/probe_interval; get_probe_interval (line ~6937) returns the probing interval for -fstack-clash-protection, and ix86_emit_probe_stack_range (line ~8463) emits explicit probe ranges. (2) Generic expansion: gcc/explow.cc — anti_adjust_stack_and_probe_stack_clash (line 2072) implements the generic stack-clash-safe allocation/probe loop used by allocate_dynamic_stack_space (dispatched at lines 1644-1646), alongside the older anti_adjust_stack_and_probe (line 2201); these are declared in gcc/explow.h together with the probe-loop helpers (compute_stack_clash_protection_loop_data, emit_stack_clash_protection_probe_loop_start/end). (3) The TARGET_STACK_CLASH_PROTECTION hook: the target hook is TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE, defined via DEFHOOK(stack_clash_protection_alloca_probe_range, ...) in gcc/target.def (line 6535); its default implementation default_stack_clash_protection_alloca_probe_range is declared in gcc/targhooks.h (line 305) and defined in gcc/targhooks.cc (line 2747). No standalone TARGET_STACK_CLASH_PROTECTION macro exists in headers — the hook above is the canonical declaration (documented in gcc/doc/tm.texi). (4) Test: gcc/testsuite/gcc.target/i386/stack-clash-protection.c — a dg-do compile test with dg-options \"-O2 -fstack-clash-protection\" validating the x86 stack clash protection codegen path. (5) Option definition: gcc/common.opt line 3054 defines fstack-clash-protection (Common Var(flag_stack_clash_protection) Optimization) — 'Insert code to probe each page of stack space as it is alloca...