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![Masahiro Yamada](/assets/img/avatar_default.png)
Commit61f60bac8c
("gcc-plugins: Change all version strings match kernel") broke parallel builds. Instead of adding the dependency between GCC plugins and utsrelease.h, let's use KERNELVERSION, which does not require any build artifact. Another reason why I want to avoid utsrelease.h is because it depends on CONFIG_LOCALVERSION(_AUTO) and localversion* files. (include/generated/utsrelease.h depends on include/config/kernel.release, which is generated by scripts/setlocalversion) I want to keep host tools independent of the kernel configuration. There is no good reason to rebuild GCC plugins just because of CONFIG_LOCALVERSION being changed. We just want to associate the plugin versions with the kernel source version. KERNELVERSION should be enough for our purpose. Fixes:61f60bac8c
("gcc-plugins: Change all version strings match kernel") Reported-by: kernel test robot <lkp@intel.com> Link: https://lore.kernel.org/linux-mm/202205230239.EZxeZ3Fv-lkp@intel.com Reported-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220524135541.1453693-1-masahiroy@kernel.org
633 lines
18 KiB
C
633 lines
18 KiB
C
/*
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* Copyright 2011-2017 by the PaX Team <pageexec@freemail.hu>
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* Modified by Alexander Popov <alex.popov@linux.com>
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* Licensed under the GPL v2
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*
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* Note: the choice of the license means that the compilation process is
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* NOT 'eligible' as defined by gcc's library exception to the GPL v3,
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* but for the kernel it doesn't matter since it doesn't link against
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* any of the gcc libraries
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*
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* This gcc plugin is needed for tracking the lowest border of the kernel stack.
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* It instruments the kernel code inserting stackleak_track_stack() calls:
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* - after alloca();
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* - for the functions with a stack frame size greater than or equal
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* to the "track-min-size" plugin parameter.
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*
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* This plugin is ported from grsecurity/PaX. For more information see:
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* https://grsecurity.net/
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* https://pax.grsecurity.net/
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*
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* Debugging:
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* - use fprintf() to stderr, debug_generic_expr(), debug_gimple_stmt(),
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* print_rtl_single() and debug_rtx();
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* - add "-fdump-tree-all -fdump-rtl-all" to the plugin CFLAGS in
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* Makefile.gcc-plugins to see the verbose dumps of the gcc passes;
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* - use gcc -E to understand the preprocessing shenanigans;
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* - use gcc with enabled CFG/GIMPLE/SSA verification (--enable-checking).
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*/
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#include "gcc-common.h"
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__visible int plugin_is_GPL_compatible;
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static int track_frame_size = -1;
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static bool build_for_x86 = false;
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static const char track_function[] = "stackleak_track_stack";
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static bool disable = false;
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static bool verbose = false;
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/*
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* Mark these global variables (roots) for gcc garbage collector since
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* they point to the garbage-collected memory.
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*/
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static GTY(()) tree track_function_decl;
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static struct plugin_info stackleak_plugin_info = {
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.version = PLUGIN_VERSION,
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.help = "track-min-size=nn\ttrack stack for functions with a stack frame size >= nn bytes\n"
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"arch=target_arch\tspecify target build arch\n"
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"disable\t\tdo not activate the plugin\n"
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"verbose\t\tprint info about the instrumentation\n"
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};
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static void add_stack_tracking_gcall(gimple_stmt_iterator *gsi, bool after)
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{
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gimple stmt;
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gcall *gimple_call;
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cgraph_node_ptr node;
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basic_block bb;
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/* Insert calling stackleak_track_stack() */
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stmt = gimple_build_call(track_function_decl, 0);
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gimple_call = as_a_gcall(stmt);
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if (after)
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gsi_insert_after(gsi, gimple_call, GSI_CONTINUE_LINKING);
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else
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gsi_insert_before(gsi, gimple_call, GSI_SAME_STMT);
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/* Update the cgraph */
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bb = gimple_bb(gimple_call);
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node = cgraph_get_create_node(track_function_decl);
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gcc_assert(node);
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cgraph_create_edge(cgraph_get_node(current_function_decl), node,
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gimple_call, bb->count,
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compute_call_stmt_bb_frequency(current_function_decl, bb));
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}
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static bool is_alloca(gimple stmt)
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{
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if (gimple_call_builtin_p(stmt, BUILT_IN_ALLOCA))
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return true;
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if (gimple_call_builtin_p(stmt, BUILT_IN_ALLOCA_WITH_ALIGN))
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return true;
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return false;
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}
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static tree get_current_stack_pointer_decl(void)
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{
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varpool_node_ptr node;
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FOR_EACH_VARIABLE(node) {
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tree var = NODE_DECL(node);
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tree name = DECL_NAME(var);
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if (DECL_NAME_LENGTH(var) != sizeof("current_stack_pointer") - 1)
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continue;
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if (strcmp(IDENTIFIER_POINTER(name), "current_stack_pointer"))
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continue;
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return var;
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}
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if (verbose) {
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fprintf(stderr, "stackleak: missing current_stack_pointer in %s()\n",
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DECL_NAME_POINTER(current_function_decl));
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}
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return NULL_TREE;
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}
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static void add_stack_tracking_gasm(gimple_stmt_iterator *gsi, bool after)
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{
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gasm *asm_call = NULL;
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tree sp_decl, input;
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vec<tree, va_gc> *inputs = NULL;
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/* 'no_caller_saved_registers' is currently supported only for x86 */
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gcc_assert(build_for_x86);
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/*
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* Insert calling stackleak_track_stack() in asm:
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* asm volatile("call stackleak_track_stack"
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* :: "r" (current_stack_pointer))
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* Use ASM_CALL_CONSTRAINT trick from arch/x86/include/asm/asm.h.
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* This constraint is taken into account during gcc shrink-wrapping
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* optimization. It is needed to be sure that stackleak_track_stack()
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* call is inserted after the prologue of the containing function,
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* when the stack frame is prepared.
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*/
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sp_decl = get_current_stack_pointer_decl();
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if (sp_decl == NULL_TREE) {
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add_stack_tracking_gcall(gsi, after);
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return;
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}
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input = build_tree_list(NULL_TREE, build_const_char_string(2, "r"));
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input = chainon(NULL_TREE, build_tree_list(input, sp_decl));
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vec_safe_push(inputs, input);
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asm_call = gimple_build_asm_vec("call stackleak_track_stack",
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inputs, NULL, NULL, NULL);
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gimple_asm_set_volatile(asm_call, true);
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if (after)
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gsi_insert_after(gsi, asm_call, GSI_CONTINUE_LINKING);
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else
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gsi_insert_before(gsi, asm_call, GSI_SAME_STMT);
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update_stmt(asm_call);
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}
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static void add_stack_tracking(gimple_stmt_iterator *gsi, bool after)
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{
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/*
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* The 'no_caller_saved_registers' attribute is used for
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* stackleak_track_stack(). If the compiler supports this attribute for
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* the target arch, we can add calling stackleak_track_stack() in asm.
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* That improves performance: we avoid useless operations with the
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* caller-saved registers in the functions from which we will remove
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* stackleak_track_stack() call during the stackleak_cleanup pass.
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*/
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if (lookup_attribute_spec(get_identifier("no_caller_saved_registers")))
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add_stack_tracking_gasm(gsi, after);
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else
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add_stack_tracking_gcall(gsi, after);
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}
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/*
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* Work with the GIMPLE representation of the code. Insert the
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* stackleak_track_stack() call after alloca() and into the beginning
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* of the function if it is not instrumented.
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*/
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static unsigned int stackleak_instrument_execute(void)
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{
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basic_block bb, entry_bb;
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bool prologue_instrumented = false, is_leaf = true;
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gimple_stmt_iterator gsi = { 0 };
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/*
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* ENTRY_BLOCK_PTR is a basic block which represents possible entry
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* point of a function. This block does not contain any code and
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* has a CFG edge to its successor.
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*/
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gcc_assert(single_succ_p(ENTRY_BLOCK_PTR_FOR_FN(cfun)));
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entry_bb = single_succ(ENTRY_BLOCK_PTR_FOR_FN(cfun));
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/*
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* Loop through the GIMPLE statements in each of cfun basic blocks.
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* cfun is a global variable which represents the function that is
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* currently processed.
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*/
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FOR_EACH_BB_FN(bb, cfun) {
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for (gsi = gsi_start_bb(bb); !gsi_end_p(gsi); gsi_next(&gsi)) {
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gimple stmt;
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stmt = gsi_stmt(gsi);
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/* Leaf function is a function which makes no calls */
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if (is_gimple_call(stmt))
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is_leaf = false;
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if (!is_alloca(stmt))
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continue;
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if (verbose) {
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fprintf(stderr, "stackleak: be careful, alloca() in %s()\n",
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DECL_NAME_POINTER(current_function_decl));
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}
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/* Insert stackleak_track_stack() call after alloca() */
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add_stack_tracking(&gsi, true);
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if (bb == entry_bb)
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prologue_instrumented = true;
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}
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}
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if (prologue_instrumented)
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return 0;
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/*
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* Special cases to skip the instrumentation.
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*
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* Taking the address of static inline functions materializes them,
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* but we mustn't instrument some of them as the resulting stack
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* alignment required by the function call ABI will break other
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* assumptions regarding the expected (but not otherwise enforced)
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* register clobbering ABI.
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*
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* Case in point: native_save_fl on amd64 when optimized for size
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* clobbers rdx if it were instrumented here.
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*
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* TODO: any more special cases?
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*/
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if (is_leaf &&
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!TREE_PUBLIC(current_function_decl) &&
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DECL_DECLARED_INLINE_P(current_function_decl)) {
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return 0;
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}
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if (is_leaf &&
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!strncmp(IDENTIFIER_POINTER(DECL_NAME(current_function_decl)),
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"_paravirt_", 10)) {
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return 0;
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}
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/* Insert stackleak_track_stack() call at the function beginning */
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bb = entry_bb;
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if (!single_pred_p(bb)) {
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/* gcc_assert(bb_loop_depth(bb) ||
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(bb->flags & BB_IRREDUCIBLE_LOOP)); */
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split_edge(single_succ_edge(ENTRY_BLOCK_PTR_FOR_FN(cfun)));
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gcc_assert(single_succ_p(ENTRY_BLOCK_PTR_FOR_FN(cfun)));
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bb = single_succ(ENTRY_BLOCK_PTR_FOR_FN(cfun));
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}
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gsi = gsi_after_labels(bb);
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add_stack_tracking(&gsi, false);
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return 0;
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}
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static bool large_stack_frame(void)
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{
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#if BUILDING_GCC_VERSION >= 8000
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return maybe_ge(get_frame_size(), track_frame_size);
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#else
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return (get_frame_size() >= track_frame_size);
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#endif
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}
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static void remove_stack_tracking_gcall(void)
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{
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rtx_insn *insn, *next;
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/*
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* Find stackleak_track_stack() calls. Loop through the chain of insns,
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* which is an RTL representation of the code for a function.
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*
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* The example of a matching insn:
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* (call_insn 8 4 10 2 (call (mem (symbol_ref ("stackleak_track_stack")
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* [flags 0x41] <function_decl 0x7f7cd3302a80 stackleak_track_stack>)
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* [0 stackleak_track_stack S1 A8]) (0)) 675 {*call} (expr_list
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* (symbol_ref ("stackleak_track_stack") [flags 0x41] <function_decl
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* 0x7f7cd3302a80 stackleak_track_stack>) (expr_list (0) (nil))) (nil))
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*/
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for (insn = get_insns(); insn; insn = next) {
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rtx body;
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next = NEXT_INSN(insn);
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/* Check the expression code of the insn */
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if (!CALL_P(insn))
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continue;
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/*
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* Check the expression code of the insn body, which is an RTL
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* Expression (RTX) describing the side effect performed by
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* that insn.
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*/
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body = PATTERN(insn);
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if (GET_CODE(body) == PARALLEL)
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body = XVECEXP(body, 0, 0);
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if (GET_CODE(body) != CALL)
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continue;
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/*
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* Check the first operand of the call expression. It should
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* be a mem RTX describing the needed subroutine with a
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* symbol_ref RTX.
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*/
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body = XEXP(body, 0);
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if (GET_CODE(body) != MEM)
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continue;
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body = XEXP(body, 0);
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if (GET_CODE(body) != SYMBOL_REF)
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continue;
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if (SYMBOL_REF_DECL(body) != track_function_decl)
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continue;
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/* Delete the stackleak_track_stack() call */
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delete_insn_and_edges(insn);
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#if BUILDING_GCC_VERSION < 8000
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if (GET_CODE(next) == NOTE &&
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NOTE_KIND(next) == NOTE_INSN_CALL_ARG_LOCATION) {
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insn = next;
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next = NEXT_INSN(insn);
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delete_insn_and_edges(insn);
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}
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#endif
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}
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}
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static bool remove_stack_tracking_gasm(void)
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{
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bool removed = false;
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rtx_insn *insn, *next;
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/* 'no_caller_saved_registers' is currently supported only for x86 */
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gcc_assert(build_for_x86);
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/*
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* Find stackleak_track_stack() asm calls. Loop through the chain of
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* insns, which is an RTL representation of the code for a function.
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*
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* The example of a matching insn:
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* (insn 11 5 12 2 (parallel [ (asm_operands/v
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* ("call stackleak_track_stack") ("") 0
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* [ (reg/v:DI 7 sp [ current_stack_pointer ]) ]
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* [ (asm_input:DI ("r")) ] [])
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* (clobber (reg:CC 17 flags)) ]) -1 (nil))
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*/
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for (insn = get_insns(); insn; insn = next) {
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rtx body;
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next = NEXT_INSN(insn);
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/* Check the expression code of the insn */
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if (!NONJUMP_INSN_P(insn))
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continue;
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/*
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* Check the expression code of the insn body, which is an RTL
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* Expression (RTX) describing the side effect performed by
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* that insn.
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*/
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body = PATTERN(insn);
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if (GET_CODE(body) != PARALLEL)
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continue;
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body = XVECEXP(body, 0, 0);
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if (GET_CODE(body) != ASM_OPERANDS)
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continue;
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if (strcmp(ASM_OPERANDS_TEMPLATE(body),
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"call stackleak_track_stack")) {
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continue;
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}
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delete_insn_and_edges(insn);
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gcc_assert(!removed);
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removed = true;
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}
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return removed;
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}
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/*
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* Work with the RTL representation of the code.
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* Remove the unneeded stackleak_track_stack() calls from the functions
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* which don't call alloca() and don't have a large enough stack frame size.
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*/
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static unsigned int stackleak_cleanup_execute(void)
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{
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const char *fn = DECL_NAME_POINTER(current_function_decl);
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bool removed = false;
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/*
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* Leave stack tracking in functions that call alloca().
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* Additional case:
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* gcc before version 7 called allocate_dynamic_stack_space() from
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* expand_stack_vars() for runtime alignment of constant-sized stack
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* variables. That caused cfun->calls_alloca to be set for functions
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* that in fact don't use alloca().
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* For more info see gcc commit 7072df0aae0c59ae437e.
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* Let's leave such functions instrumented as well.
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*/
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if (cfun->calls_alloca) {
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if (verbose)
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fprintf(stderr, "stackleak: instrument %s(): calls_alloca\n", fn);
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return 0;
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}
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/* Leave stack tracking in functions with large stack frame */
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if (large_stack_frame()) {
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if (verbose)
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fprintf(stderr, "stackleak: instrument %s()\n", fn);
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return 0;
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}
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if (lookup_attribute_spec(get_identifier("no_caller_saved_registers")))
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removed = remove_stack_tracking_gasm();
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if (!removed)
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remove_stack_tracking_gcall();
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return 0;
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}
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/*
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* STRING_CST may or may not be NUL terminated:
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* https://gcc.gnu.org/onlinedocs/gccint/Constant-expressions.html
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*/
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static inline bool string_equal(tree node, const char *string, int length)
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{
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if (TREE_STRING_LENGTH(node) < length)
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return false;
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if (TREE_STRING_LENGTH(node) > length + 1)
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return false;
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if (TREE_STRING_LENGTH(node) == length + 1 &&
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TREE_STRING_POINTER(node)[length] != '\0')
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return false;
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return !memcmp(TREE_STRING_POINTER(node), string, length);
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}
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#define STRING_EQUAL(node, str) string_equal(node, str, strlen(str))
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static bool stackleak_gate(void)
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{
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tree section;
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section = lookup_attribute("section",
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DECL_ATTRIBUTES(current_function_decl));
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if (section && TREE_VALUE(section)) {
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section = TREE_VALUE(TREE_VALUE(section));
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if (STRING_EQUAL(section, ".init.text"))
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return false;
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if (STRING_EQUAL(section, ".devinit.text"))
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return false;
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if (STRING_EQUAL(section, ".cpuinit.text"))
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return false;
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if (STRING_EQUAL(section, ".meminit.text"))
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return false;
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if (STRING_EQUAL(section, ".noinstr.text"))
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return false;
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if (STRING_EQUAL(section, ".entry.text"))
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return false;
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}
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return track_frame_size >= 0;
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}
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/* Build the function declaration for stackleak_track_stack() */
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static void stackleak_start_unit(void *gcc_data __unused,
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void *user_data __unused)
|
|
{
|
|
tree fntype;
|
|
|
|
/* void stackleak_track_stack(void) */
|
|
fntype = build_function_type_list(void_type_node, NULL_TREE);
|
|
track_function_decl = build_fn_decl(track_function, fntype);
|
|
DECL_ASSEMBLER_NAME(track_function_decl); /* for LTO */
|
|
TREE_PUBLIC(track_function_decl) = 1;
|
|
TREE_USED(track_function_decl) = 1;
|
|
DECL_EXTERNAL(track_function_decl) = 1;
|
|
DECL_ARTIFICIAL(track_function_decl) = 1;
|
|
DECL_PRESERVE_P(track_function_decl) = 1;
|
|
}
|
|
|
|
/*
|
|
* Pass gate function is a predicate function that gets executed before the
|
|
* corresponding pass. If the return value is 'true' the pass gets executed,
|
|
* otherwise, it is skipped.
|
|
*/
|
|
static bool stackleak_instrument_gate(void)
|
|
{
|
|
return stackleak_gate();
|
|
}
|
|
|
|
#define PASS_NAME stackleak_instrument
|
|
#define PROPERTIES_REQUIRED PROP_gimple_leh | PROP_cfg
|
|
#define TODO_FLAGS_START TODO_verify_ssa | TODO_verify_flow | TODO_verify_stmts
|
|
#define TODO_FLAGS_FINISH TODO_verify_ssa | TODO_verify_stmts | TODO_dump_func \
|
|
| TODO_update_ssa | TODO_rebuild_cgraph_edges
|
|
#include "gcc-generate-gimple-pass.h"
|
|
|
|
static bool stackleak_cleanup_gate(void)
|
|
{
|
|
return stackleak_gate();
|
|
}
|
|
|
|
#define PASS_NAME stackleak_cleanup
|
|
#define TODO_FLAGS_FINISH TODO_dump_func
|
|
#include "gcc-generate-rtl-pass.h"
|
|
|
|
/*
|
|
* Every gcc plugin exports a plugin_init() function that is called right
|
|
* after the plugin is loaded. This function is responsible for registering
|
|
* the plugin callbacks and doing other required initialization.
|
|
*/
|
|
__visible int plugin_init(struct plugin_name_args *plugin_info,
|
|
struct plugin_gcc_version *version)
|
|
{
|
|
const char * const plugin_name = plugin_info->base_name;
|
|
const int argc = plugin_info->argc;
|
|
const struct plugin_argument * const argv = plugin_info->argv;
|
|
int i = 0;
|
|
|
|
/* Extra GGC root tables describing our GTY-ed data */
|
|
static const struct ggc_root_tab gt_ggc_r_gt_stackleak[] = {
|
|
{
|
|
.base = &track_function_decl,
|
|
.nelt = 1,
|
|
.stride = sizeof(track_function_decl),
|
|
.cb = >_ggc_mx_tree_node,
|
|
.pchw = >_pch_nx_tree_node
|
|
},
|
|
LAST_GGC_ROOT_TAB
|
|
};
|
|
|
|
/*
|
|
* The stackleak_instrument pass should be executed before the
|
|
* "optimized" pass, which is the control flow graph cleanup that is
|
|
* performed just before expanding gcc trees to the RTL. In former
|
|
* versions of the plugin this new pass was inserted before the
|
|
* "tree_profile" pass, which is currently called "profile".
|
|
*/
|
|
PASS_INFO(stackleak_instrument, "optimized", 1,
|
|
PASS_POS_INSERT_BEFORE);
|
|
|
|
/*
|
|
* The stackleak_cleanup pass should be executed before the "*free_cfg"
|
|
* pass. It's the moment when the stack frame size is already final,
|
|
* function prologues and epilogues are generated, and the
|
|
* machine-dependent code transformations are not done.
|
|
*/
|
|
PASS_INFO(stackleak_cleanup, "*free_cfg", 1, PASS_POS_INSERT_BEFORE);
|
|
|
|
if (!plugin_default_version_check(version, &gcc_version)) {
|
|
error(G_("incompatible gcc/plugin versions"));
|
|
return 1;
|
|
}
|
|
|
|
/* Parse the plugin arguments */
|
|
for (i = 0; i < argc; i++) {
|
|
if (!strcmp(argv[i].key, "track-min-size")) {
|
|
if (!argv[i].value) {
|
|
error(G_("no value supplied for option '-fplugin-arg-%s-%s'"),
|
|
plugin_name, argv[i].key);
|
|
return 1;
|
|
}
|
|
|
|
track_frame_size = atoi(argv[i].value);
|
|
if (track_frame_size < 0) {
|
|
error(G_("invalid option argument '-fplugin-arg-%s-%s=%s'"),
|
|
plugin_name, argv[i].key, argv[i].value);
|
|
return 1;
|
|
}
|
|
} else if (!strcmp(argv[i].key, "arch")) {
|
|
if (!argv[i].value) {
|
|
error(G_("no value supplied for option '-fplugin-arg-%s-%s'"),
|
|
plugin_name, argv[i].key);
|
|
return 1;
|
|
}
|
|
|
|
if (!strcmp(argv[i].value, "x86"))
|
|
build_for_x86 = true;
|
|
} else if (!strcmp(argv[i].key, "disable")) {
|
|
disable = true;
|
|
} else if (!strcmp(argv[i].key, "verbose")) {
|
|
verbose = true;
|
|
} else {
|
|
error(G_("unknown option '-fplugin-arg-%s-%s'"),
|
|
plugin_name, argv[i].key);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (disable) {
|
|
if (verbose)
|
|
fprintf(stderr, "stackleak: disabled for this translation unit\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Give the information about the plugin */
|
|
register_callback(plugin_name, PLUGIN_INFO, NULL,
|
|
&stackleak_plugin_info);
|
|
|
|
/* Register to be called before processing a translation unit */
|
|
register_callback(plugin_name, PLUGIN_START_UNIT,
|
|
&stackleak_start_unit, NULL);
|
|
|
|
/* Register an extra GCC garbage collector (GGC) root table */
|
|
register_callback(plugin_name, PLUGIN_REGISTER_GGC_ROOTS, NULL,
|
|
(void *)>_ggc_r_gt_stackleak);
|
|
|
|
/*
|
|
* Hook into the Pass Manager to register new gcc passes.
|
|
*
|
|
* The stack frame size info is available only at the last RTL pass,
|
|
* when it's too late to insert complex code like a function call.
|
|
* So we register two gcc passes to instrument every function at first
|
|
* and remove the unneeded instrumentation later.
|
|
*/
|
|
register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL,
|
|
&stackleak_instrument_pass_info);
|
|
register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL,
|
|
&stackleak_cleanup_pass_info);
|
|
|
|
return 0;
|
|
}
|