diff options
Diffstat (limited to 'gnu/packages/patches/libcroco-CVE-2020-12825.patch')
| -rw-r--r-- | gnu/packages/patches/libcroco-CVE-2020-12825.patch | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/gnu/packages/patches/libcroco-CVE-2020-12825.patch b/gnu/packages/patches/libcroco-CVE-2020-12825.patch new file mode 100644 index 0000000000..35005a6a19 --- /dev/null +++ b/gnu/packages/patches/libcroco-CVE-2020-12825.patch @@ -0,0 +1,187 @@ +From 7b64eb285dd937b34df71c95188301be50dd1409 Mon Sep 17 00:00:00 2001 +From: Michael Catanzaro <mcatanzaro@gnome.org> +Date: Wed, 12 Aug 2020 13:54:15 -0500 +Subject: [PATCH] libcroco: Limit recursion in block and any productions + (CVE-2020-12825) + +If we don't have any limits, we can recurse forever and overflow the +stack. + +This is per https://gitlab.gnome.org/Archive/libcroco/-/issues/8 + +https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1404 +--- + src/st/croco/cr-parser.c | 44 ++++++++++++++++++++++++++-------------- + 1 file changed, 29 insertions(+), 15 deletions(-) + +diff --git a/src/st/croco/cr-parser.c b/src/st/croco/cr-parser.c +index 07f4ed9e8b..8304b75614 100644 +--- a/src/cr-parser.c ++++ b/src/cr-parser.c +@@ -136,6 +136,8 @@ struct _CRParserPriv { + + #define CHARS_TAB_SIZE 12 + ++#define RECURSIVE_CALLERS_LIMIT 100 ++ + /** + * IS_NUM: + *@a_char: the char to test. +@@ -343,9 +345,11 @@ static enum CRStatus cr_parser_parse_selector_core (CRParser * a_this); + + static enum CRStatus cr_parser_parse_declaration_core (CRParser * a_this); + +-static enum CRStatus cr_parser_parse_any_core (CRParser * a_this); ++static enum CRStatus cr_parser_parse_any_core (CRParser * a_this, ++ guint n_calls); + +-static enum CRStatus cr_parser_parse_block_core (CRParser * a_this); ++static enum CRStatus cr_parser_parse_block_core (CRParser * a_this, ++ guint n_calls); + + static enum CRStatus cr_parser_parse_value_core (CRParser * a_this); + +@@ -783,7 +787,7 @@ cr_parser_parse_atrule_core (CRParser * a_this) + cr_parser_try_to_skip_spaces_and_comments (a_this); + + do { +- status = cr_parser_parse_any_core (a_this); ++ status = cr_parser_parse_any_core (a_this, 0); + } while (status == CR_OK); + + status = cr_tknzr_get_next_token (PRIVATE (a_this)->tknzr, +@@ -794,7 +798,7 @@ cr_parser_parse_atrule_core (CRParser * a_this) + cr_tknzr_unget_token (PRIVATE (a_this)->tknzr, + token); + token = NULL; +- status = cr_parser_parse_block_core (a_this); ++ status = cr_parser_parse_block_core (a_this, 0); + CHECK_PARSING_STATUS (status, + FALSE); + goto done; +@@ -929,11 +933,11 @@ cr_parser_parse_selector_core (CRParser * a_this) + + RECORD_INITIAL_POS (a_this, &init_pos); + +- status = cr_parser_parse_any_core (a_this); ++ status = cr_parser_parse_any_core (a_this, 0); + CHECK_PARSING_STATUS (status, FALSE); + + do { +- status = cr_parser_parse_any_core (a_this); ++ status = cr_parser_parse_any_core (a_this, 0); + + } while (status == CR_OK); + +@@ -955,10 +959,12 @@ cr_parser_parse_selector_core (CRParser * a_this) + *in chapter 4.1 of the css2 spec. + *block ::= '{' S* [ any | block | ATKEYWORD S* | ';' ]* '}' S*; + *@param a_this the current instance of #CRParser. ++ *@param n_calls used to limit recursion depth + *FIXME: code this function. + */ + static enum CRStatus +-cr_parser_parse_block_core (CRParser * a_this) ++cr_parser_parse_block_core (CRParser * a_this, ++ guint n_calls) + { + CRToken *token = NULL; + CRInputPos init_pos; +@@ -966,6 +972,9 @@ cr_parser_parse_block_core (CRParser * a_this) + + g_return_val_if_fail (a_this && PRIVATE (a_this), CR_BAD_PARAM_ERROR); + ++ if (n_calls > RECURSIVE_CALLERS_LIMIT) ++ return CR_ERROR; ++ + RECORD_INITIAL_POS (a_this, &init_pos); + + status = cr_tknzr_get_next_token (PRIVATE (a_this)->tknzr, &token); +@@ -995,13 +1004,13 @@ cr_parser_parse_block_core (CRParser * a_this) + } else if (token->type == CBO_TK) { + cr_tknzr_unget_token (PRIVATE (a_this)->tknzr, token); + token = NULL; +- status = cr_parser_parse_block_core (a_this); ++ status = cr_parser_parse_block_core (a_this, n_calls + 1); + CHECK_PARSING_STATUS (status, FALSE); + goto parse_block_content; + } else { + cr_tknzr_unget_token (PRIVATE (a_this)->tknzr, token); + token = NULL; +- status = cr_parser_parse_any_core (a_this); ++ status = cr_parser_parse_any_core (a_this, n_calls + 1); + CHECK_PARSING_STATUS (status, FALSE); + goto parse_block_content; + } +@@ -1108,7 +1117,7 @@ cr_parser_parse_value_core (CRParser * a_this) + status = cr_tknzr_unget_token (PRIVATE (a_this)->tknzr, + token); + token = NULL; +- status = cr_parser_parse_block_core (a_this); ++ status = cr_parser_parse_block_core (a_this, 0); + CHECK_PARSING_STATUS (status, FALSE); + ref++; + goto continue_parsing; +@@ -1122,7 +1131,7 @@ cr_parser_parse_value_core (CRParser * a_this) + status = cr_tknzr_unget_token (PRIVATE (a_this)->tknzr, + token); + token = NULL; +- status = cr_parser_parse_any_core (a_this); ++ status = cr_parser_parse_any_core (a_this, 0); + if (status == CR_OK) { + ref++; + goto continue_parsing; +@@ -1161,10 +1170,12 @@ cr_parser_parse_value_core (CRParser * a_this) + * | FUNCTION | DASHMATCH | '(' any* ')' | '[' any* ']' ] S*; + * + *@param a_this the current instance of #CRParser. ++ *@param n_calls used to limit recursion depth + *@return CR_OK upon successfull completion, an error code otherwise. + */ + static enum CRStatus +-cr_parser_parse_any_core (CRParser * a_this) ++cr_parser_parse_any_core (CRParser * a_this, ++ guint n_calls) + { + CRToken *token1 = NULL, + *token2 = NULL; +@@ -1173,6 +1184,9 @@ cr_parser_parse_any_core (CRParser * a_this) + + g_return_val_if_fail (a_this, CR_BAD_PARAM_ERROR); + ++ if (n_calls > RECURSIVE_CALLERS_LIMIT) ++ return CR_ERROR; ++ + RECORD_INITIAL_POS (a_this, &init_pos); + + status = cr_tknzr_get_next_token (PRIVATE (a_this)->tknzr, &token1); +@@ -1211,7 +1225,7 @@ cr_parser_parse_any_core (CRParser * a_this) + *We consider parameter as being an "any*" production. + */ + do { +- status = cr_parser_parse_any_core (a_this); ++ status = cr_parser_parse_any_core (a_this, n_calls + 1); + } while (status == CR_OK); + + ENSURE_PARSING_COND (status == CR_PARSING_ERROR); +@@ -1236,7 +1250,7 @@ cr_parser_parse_any_core (CRParser * a_this) + } + + do { +- status = cr_parser_parse_any_core (a_this); ++ status = cr_parser_parse_any_core (a_this, n_calls + 1); + } while (status == CR_OK); + + ENSURE_PARSING_COND (status == CR_PARSING_ERROR); +@@ -1264,7 +1278,7 @@ cr_parser_parse_any_core (CRParser * a_this) + } + + do { +- status = cr_parser_parse_any_core (a_this); ++ status = cr_parser_parse_any_core (a_this, n_calls + 1); + } while (status == CR_OK); + + ENSURE_PARSING_COND (status == CR_PARSING_ERROR); +-- +GitLab + |