diff options
Diffstat (limited to 'gnu/packages/patches')
| -rw-r--r-- | gnu/packages/patches/gcc-8-strmov-store-file-names.patch | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/gnu/packages/patches/gcc-8-strmov-store-file-names.patch b/gnu/packages/patches/gcc-8-strmov-store-file-names.patch new file mode 100644 index 0000000000..f8e6b951b2 --- /dev/null +++ b/gnu/packages/patches/gcc-8-strmov-store-file-names.patch @@ -0,0 +1,110 @@ +Make sure that statements such as: + + strcpy (dst, "/gnu/store/…"); + +or + + static const char str[] = "/gnu/store/…"; + … + strcpy (dst, str); + +do not result in chunked /gnu/store strings that are undetectable by +Guix's GC and its grafting code. See <https://bugs.gnu.org/24703> +and <https://bugs.gnu.org/30395>. + +--- gcc-5.3.0/gcc/builtins.c 2016-10-18 10:50:46.080616285 +0200 ++++ gcc-5.3.0/gcc/builtins.c 2016-11-09 15:26:43.693042737 +0100 +@@ -3012,6 +3012,58 @@ determine_block_size (tree len, rtx len_rtx, + GET_MODE_MASK (GET_MODE (len_rtx))); + } + ++extern void debug_tree (tree); ++ ++/* Return true if STR contains the string "/gnu/store". */ ++ ++bool ++store_reference_p (tree str) ++{ ++ if (getenv ("GUIX_GCC_DEBUG") != NULL) ++ debug_tree (str); ++ ++ if (TREE_CODE (str) == ADDR_EXPR) ++ str = TREE_OPERAND (str, 0); ++ ++ if (TREE_CODE (str) == VAR_DECL ++ && TREE_STATIC (str) ++ && TREE_READONLY (str)) ++ { ++ /* STR may be a 'static const' variable whose initial value ++ is a string constant. See <https://bugs.gnu.org/30395>. */ ++ str = DECL_INITIAL (str); ++ if (str == NULL_TREE) ++ return false; ++ } ++ ++ if (TREE_CODE (str) != STRING_CST) ++ return false; ++ ++ int len; ++ const char *store; ++ ++ store = getenv ("NIX_STORE") ? getenv ("NIX_STORE") : "/gnu/store"; ++ len = strlen (store); ++ ++ /* Size of the hash part of store file names, including leading slash and ++ trailing hyphen. */ ++ const int hash_len = 34; ++ ++ if (TREE_STRING_LENGTH (str) < len + hash_len) ++ return false; ++ ++ /* We cannot use 'strstr' because 'TREE_STRING_POINTER' returns a string ++ that is not necessarily NUL-terminated. */ ++ ++ for (int i = 0; i < TREE_STRING_LENGTH (str) - (len + hash_len); i++) ++ { ++ if (strncmp (TREE_STRING_POINTER (str) + i, store, len) == 0) ++ return true; ++ } ++ ++ return false; ++} ++ + /* Try to verify that the sizes and lengths of the arguments to a string + manipulation function given by EXP are within valid bounds and that + the operation does not lead to buffer overflow or read past the end. +@@ -3605,6 +3657,13 @@ expand_builtin_memory_copy_args (tree dest, tree src, tree len, + unsigned HOST_WIDE_INT max_size; + unsigned HOST_WIDE_INT probable_max_size; + ++ /* Do not emit block moves, which translate to the 'movabs' instruction on ++ x86_64, when SRC refers to store items. That way, store references ++ remain visible to the Guix GC and grafting code. See ++ <https://bugs.gnu.org/24703>. */ ++ if (store_reference_p (src)) ++ return NULL_RTX; ++ + /* If DEST is not a pointer type, call the normal function. */ + if (dest_align == 0) + return NULL_RTX; +--- gcc-5.5.0/gcc/gimple-fold.c 2018-03-20 11:36:16.709442004 +0100 ++++ gcc-5.5.0/gcc/gimple-fold.c 2018-03-20 11:46:43.838487065 +0100 +@@ -635,6 +635,8 @@ var_decl_component_p (tree var) + return SSA_VAR_P (inner); + } + ++extern bool store_reference_p (tree); ++ + /* If the SIZE argument representing the size of an object is in a range + of values of which exactly one is valid (and that is zero), return + true, otherwise false. */ +@@ -742,6 +744,9 @@ gimple_fold_builtin_memory_op (gimple_stmt_iterator *gsi, + off0 = build_int_cst (build_pointer_type_for_mode (char_type_node, + ptr_mode, true), 0); + ++ if (store_reference_p (src)) ++ return false; ++ + /* If we can perform the copy efficiently with first doing all loads + and then all stores inline it that way. Currently efficiently + means that we can load all the memory into a single integer |