208 lines
6.2 KiB
C
208 lines
6.2 KiB
C
/* AddressSanitizer, a fast memory error detector.
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Copyright (C) 2011-2019 Free Software Foundation, Inc.
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Contributed by Kostya Serebryany <kcc@google.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef TREE_ASAN
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#define TREE_ASAN
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extern void asan_function_start (void);
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extern void asan_finish_file (void);
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extern rtx_insn *asan_emit_stack_protection (rtx, rtx, unsigned int,
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HOST_WIDE_INT *, tree *, int);
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extern rtx_insn *asan_emit_allocas_unpoison (rtx, rtx, rtx_insn *);
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extern bool asan_protect_global (tree, bool ignore_decl_rtl_set_p = false);
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extern void initialize_sanitizer_builtins (void);
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extern tree asan_dynamic_init_call (bool);
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extern bool asan_expand_check_ifn (gimple_stmt_iterator *, bool);
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extern bool asan_expand_mark_ifn (gimple_stmt_iterator *);
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extern bool asan_expand_poison_ifn (gimple_stmt_iterator *, bool *,
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hash_map<tree, tree> &);
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extern gimple_stmt_iterator create_cond_insert_point
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(gimple_stmt_iterator *, bool, bool, bool, basic_block *, basic_block *);
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/* Alias set for accessing the shadow memory. */
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extern alias_set_type asan_shadow_set;
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/* Hash set of labels that are either used in a goto, or their address
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has been taken. */
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extern hash_set <tree> *asan_used_labels;
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/* Shadow memory is found at
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(address >> ASAN_SHADOW_SHIFT) + asan_shadow_offset (). */
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#define ASAN_SHADOW_SHIFT 3
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#define ASAN_SHADOW_GRANULARITY (1UL << ASAN_SHADOW_SHIFT)
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/* Red zone size, stack and global variables are padded by ASAN_RED_ZONE_SIZE
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up to 2 * ASAN_RED_ZONE_SIZE - 1 bytes. */
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#define ASAN_RED_ZONE_SIZE 32
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/* Stack variable use more compact red zones. The size includes also
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size of variable itself. */
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#define ASAN_MIN_RED_ZONE_SIZE 16
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/* Shadow memory values for stack protection. Left is below protected vars,
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the first pointer in stack corresponding to that offset contains
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ASAN_STACK_FRAME_MAGIC word, the second pointer to a string describing
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the frame. Middle is for padding in between variables, right is
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above the last protected variable and partial immediately after variables
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up to ASAN_RED_ZONE_SIZE alignment. */
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#define ASAN_STACK_MAGIC_LEFT 0xf1
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#define ASAN_STACK_MAGIC_MIDDLE 0xf2
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#define ASAN_STACK_MAGIC_RIGHT 0xf3
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#define ASAN_STACK_MAGIC_USE_AFTER_RET 0xf5
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#define ASAN_STACK_MAGIC_USE_AFTER_SCOPE 0xf8
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#define ASAN_STACK_FRAME_MAGIC 0x41b58ab3
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#define ASAN_STACK_RETIRED_MAGIC 0x45e0360e
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#define ASAN_USE_AFTER_SCOPE_ATTRIBUTE "use after scope memory"
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/* Various flags for Asan builtins. */
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enum asan_check_flags
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{
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ASAN_CHECK_STORE = 1 << 0,
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ASAN_CHECK_SCALAR_ACCESS = 1 << 1,
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ASAN_CHECK_NON_ZERO_LEN = 1 << 2,
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ASAN_CHECK_LAST = 1 << 3
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};
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/* Flags for Asan check builtins. */
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#define IFN_ASAN_MARK_FLAGS DEF(POISON), DEF(UNPOISON)
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enum asan_mark_flags
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{
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#define DEF(X) ASAN_MARK_##X
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IFN_ASAN_MARK_FLAGS
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#undef DEF
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};
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/* Return true if STMT is ASAN_MARK with FLAG as first argument. */
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extern bool asan_mark_p (gimple *stmt, enum asan_mark_flags flag);
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/* Return the size of padding needed to insert after a protected
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decl of SIZE. */
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static inline unsigned int
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asan_red_zone_size (unsigned int size)
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{
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unsigned int c = size & (ASAN_RED_ZONE_SIZE - 1);
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return c ? 2 * ASAN_RED_ZONE_SIZE - c : ASAN_RED_ZONE_SIZE;
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}
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/* Return how much a stack variable occupis on a stack
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including a space for red zone. */
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static inline unsigned HOST_WIDE_INT
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asan_var_and_redzone_size (unsigned HOST_WIDE_INT size)
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{
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if (size <= 4)
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return 16;
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else if (size <= 16)
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return 32;
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else if (size <= 128)
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return size + 32;
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else if (size <= 512)
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return size + 64;
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else if (size <= 4096)
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return size + 128;
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else
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return size + 256;
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}
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extern bool set_asan_shadow_offset (const char *);
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extern void set_sanitized_sections (const char *);
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extern bool asan_sanitize_stack_p (void);
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extern bool asan_sanitize_allocas_p (void);
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extern hash_set<tree> *asan_handled_variables;
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/* Return TRUE if builtin with given FCODE will be intercepted by
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libasan. */
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static inline bool
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asan_intercepted_p (enum built_in_function fcode)
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{
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return fcode == BUILT_IN_INDEX
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|| fcode == BUILT_IN_MEMCHR
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|| fcode == BUILT_IN_MEMCMP
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|| fcode == BUILT_IN_MEMCPY
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|| fcode == BUILT_IN_MEMMOVE
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|| fcode == BUILT_IN_MEMSET
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|| fcode == BUILT_IN_STRCASECMP
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|| fcode == BUILT_IN_STRCAT
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|| fcode == BUILT_IN_STRCHR
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|| fcode == BUILT_IN_STRCMP
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|| fcode == BUILT_IN_STRCPY
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|| fcode == BUILT_IN_STRDUP
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|| fcode == BUILT_IN_STRLEN
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|| fcode == BUILT_IN_STRNCASECMP
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|| fcode == BUILT_IN_STRNCAT
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|| fcode == BUILT_IN_STRNCMP
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|| fcode == BUILT_IN_STRCSPN
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|| fcode == BUILT_IN_STRPBRK
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|| fcode == BUILT_IN_STRSPN
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|| fcode == BUILT_IN_STRSTR
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|| fcode == BUILT_IN_STRNCPY;
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}
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/* Return TRUE if we should instrument for use-after-scope sanity checking. */
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static inline bool
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asan_sanitize_use_after_scope (void)
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{
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return (flag_sanitize_address_use_after_scope && asan_sanitize_stack_p ());
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}
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/* Return true if DECL should be guarded on the stack. */
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static inline bool
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asan_protect_stack_decl (tree decl)
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{
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return DECL_P (decl)
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&& (!DECL_ARTIFICIAL (decl)
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|| (asan_sanitize_use_after_scope () && TREE_ADDRESSABLE (decl)));
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}
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/* Return true when flag_sanitize & FLAG is non-zero. If FN is non-null,
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remove all flags mentioned in "no_sanitize" of DECL_ATTRIBUTES. */
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static inline bool
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sanitize_flags_p (unsigned int flag, const_tree fn = current_function_decl)
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{
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unsigned int result_flags = flag_sanitize & flag;
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if (result_flags == 0)
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return false;
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if (fn != NULL_TREE)
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{
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tree value = lookup_attribute ("no_sanitize", DECL_ATTRIBUTES (fn));
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if (value)
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result_flags &= ~tree_to_uhwi (TREE_VALUE (value));
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}
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return result_flags;
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}
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#endif /* TREE_ASAN */
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