diff options
Diffstat (limited to 'gnu/packages/patches/mupdf-CVE-2017-17858.patch')
| -rw-r--r-- | gnu/packages/patches/mupdf-CVE-2017-17858.patch | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/gnu/packages/patches/mupdf-CVE-2017-17858.patch b/gnu/packages/patches/mupdf-CVE-2017-17858.patch new file mode 100644 index 0000000000..66df127509 --- /dev/null +++ b/gnu/packages/patches/mupdf-CVE-2017-17858.patch @@ -0,0 +1,111 @@ +Fix CVE-2017-17858: + +https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-17858 +https://bugs.ghostscript.com/show_bug.cgi?id=698819 +https://github.com/mzet-/Security-Advisories/blob/master/mzet-adv-2017-01.md + +Patch copied from upstream source repository: + +https://git.ghostscript.com/?p=mupdf.git;a=commit;h=55c3f68d638ac1263a386e0aaa004bb6e8bde731 + +From 55c3f68d638ac1263a386e0aaa004bb6e8bde731 Mon Sep 17 00:00:00 2001 +From: Sebastian Rasmussen <sebras@gmail.com> +Date: Mon, 11 Dec 2017 14:09:15 +0100 +Subject: [PATCH] Bugs 698804/698810/698811: Keep PDF object numbers below + limit. + +This ensures that: + * xref tables with objects pointers do not grow out of bounds. + * other readers, e.g. Adobe Acrobat can parse PDFs written by mupdf. +--- + include/mupdf/pdf/object.h | 3 +++ + source/pdf/pdf-repair.c | 5 +---- + source/pdf/pdf-xref.c | 21 ++++++++++++--------- + 3 files changed, 16 insertions(+), 13 deletions(-) + +diff --git a/include/mupdf/pdf/object.h b/include/mupdf/pdf/object.h +index 21ed8595..4177112b 100644 +--- a/include/mupdf/pdf/object.h ++++ b/include/mupdf/pdf/object.h +@@ -3,6 +3,9 @@ + + typedef struct pdf_document_s pdf_document; + ++/* Defined in PDF 1.7 according to Acrobat limit. */ ++#define PDF_MAX_OBJECT_NUMBER 8388607 ++ + /* + * Dynamic objects. + * The same type of objects as found in PDF and PostScript. +diff --git a/source/pdf/pdf-repair.c b/source/pdf/pdf-repair.c +index ca149bd3..0c29758e 100644 +--- a/source/pdf/pdf-repair.c ++++ b/source/pdf/pdf-repair.c +@@ -6,9 +6,6 @@ + + /* Scan file for objects and reconstruct xref table */ + +-/* Define in PDF 1.7 to be 8388607, but mupdf is more lenient. */ +-#define MAX_OBJECT_NUMBER (10 << 20) +- + struct entry + { + int num; +@@ -436,7 +433,7 @@ pdf_repair_xref(fz_context *ctx, pdf_document *doc) + break; + } + +- if (num <= 0 || num > MAX_OBJECT_NUMBER) ++ if (num <= 0 || num > PDF_MAX_OBJECT_NUMBER) + { + fz_warn(ctx, "ignoring object with invalid object number (%d %d R)", num, gen); + goto have_next_token; +diff --git a/source/pdf/pdf-xref.c b/source/pdf/pdf-xref.c +index 00586dbd..6284e70b 100644 +--- a/source/pdf/pdf-xref.c ++++ b/source/pdf/pdf-xref.c +@@ -868,11 +868,12 @@ pdf_read_old_xref(fz_context *ctx, pdf_document *doc, pdf_lexbuf *buf) + fz_seek(ctx, file, -(2 + (int)strlen(s)), SEEK_CUR); + } + +- if (ofs < 0) +- fz_throw(ctx, FZ_ERROR_GENERIC, "out of range object num in xref: %d", (int)ofs); +- if (ofs > INT64_MAX - len) +- fz_throw(ctx, FZ_ERROR_GENERIC, "xref section object numbers too big"); +- ++ if (ofs < 0 || ofs > PDF_MAX_OBJECT_NUMBER ++ || len < 0 || len > PDF_MAX_OBJECT_NUMBER ++ || ofs + len - 1 > PDF_MAX_OBJECT_NUMBER) ++ { ++ fz_throw(ctx, FZ_ERROR_GENERIC, "xref subsection object numbers are out of range"); ++ } + /* broken pdfs where size in trailer undershoots entries in xref sections */ + if (ofs + len > xref_len) + { +@@ -933,10 +934,8 @@ pdf_read_new_xref_section(fz_context *ctx, pdf_document *doc, fz_stream *stm, in + pdf_xref_entry *table; + int i, n; + +- if (i0 < 0 || i1 < 0 || i0 > INT_MAX - i1) +- fz_throw(ctx, FZ_ERROR_GENERIC, "negative xref stream entry index"); +- //if (i0 + i1 > pdf_xref_len(ctx, doc)) +- // fz_throw(ctx, FZ_ERROR_GENERIC, "xref stream has too many entries"); ++ if (i0 < 0 || i0 > PDF_MAX_OBJECT_NUMBER || i1 < 0 || i1 > PDF_MAX_OBJECT_NUMBER || i0 + i1 - 1 > PDF_MAX_OBJECT_NUMBER) ++ fz_throw(ctx, FZ_ERROR_GENERIC, "xref subsection object numbers are out of range"); + + table = pdf_xref_find_subsection(ctx, doc, i0, i1); + for (i = i0; i < i0 + i1; i++) +@@ -2086,6 +2085,10 @@ pdf_create_object(fz_context *ctx, pdf_document *doc) + /* TODO: reuse free object slots by properly linking free object chains in the ofs field */ + pdf_xref_entry *entry; + int num = pdf_xref_len(ctx, doc); ++ ++ if (num > PDF_MAX_OBJECT_NUMBER) ++ fz_throw(ctx, FZ_ERROR_GENERIC, "too many objects stored in pdf"); ++ + entry = pdf_get_incremental_xref_entry(ctx, doc, num); + entry->type = 'f'; + entry->ofs = -1; +-- +2.16.1 + |