diff options
Diffstat (limited to 'gnu/packages/patches/ghostscript-CVE-2016-7976.patch')
| -rw-r--r-- | gnu/packages/patches/ghostscript-CVE-2016-7976.patch | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/gnu/packages/patches/ghostscript-CVE-2016-7976.patch b/gnu/packages/patches/ghostscript-CVE-2016-7976.patch new file mode 100644 index 0000000000..0a09f89016 --- /dev/null +++ b/gnu/packages/patches/ghostscript-CVE-2016-7976.patch @@ -0,0 +1,185 @@ +The following patch was adapted for GNU Ghostscript +by Mark H Weaver <mhw@netris.org> based on: + +http://git.ghostscript.com/?p=ghostpdl.git;a=commit;h=6d444c273da5499a4cd72f21cb6d4c9a5256807d + +From 6d444c273da5499a4cd72f21cb6d4c9a5256807d Mon Sep 17 00:00:00 2001 +From: Chris Liddell <chris.liddell@artifex.com> +Date: Wed, 5 Oct 2016 09:55:55 +0100 +Subject: [PATCH] Bug 697178: Add a file permissions callback + +For the rare occasions when the graphics library directly opens a file +(currently for reading), this allows us to apply any restrictions on +file access normally applied in the interpteter. +--- + base/gsicc_manage.c | 10 ++++++---- + base/gslibctx.c | 12 +++++++++++- + base/gslibctx.h | 7 +++++++ + psi/imain.c | 2 ++ + psi/int.mak | 2 +- + psi/zfile.c | 19 +++++++++++++++++++ + psi/zfile.h | 7 +++++++ + 7 files changed, 53 insertions(+), 6 deletions(-) + +diff --git a/base/gsicc_manage.c b/base/gsicc_manage.c +index 931c2a6..e9c09c3 100644 +--- a/base/gsicc_manage.c ++++ b/base/gsicc_manage.c +@@ -1028,10 +1028,12 @@ gsicc_open_search(const char* pname, int namelen, gs_memory_t *mem_gc, + } + + /* First just try it like it is */ +- str = sfopen(pname, "rb", mem_gc); +- if (str != NULL) { +- *strp = str; +- return 0; ++ if (gs_check_file_permission(mem_gc, pname, namelen, "r") >= 0) { ++ str = sfopen(pname, "rb", mem_gc); ++ if (str != NULL) { ++ *strp = str; ++ return 0; ++ } + } + + /* If that fails, try %rom% */ /* FIXME: Not sure this is needed or correct */ +diff --git a/base/gslibctx.c b/base/gslibctx.c +index eaa0458..37ce1ca 100644 +--- a/base/gslibctx.c ++++ b/base/gslibctx.c +@@ -121,7 +121,7 @@ int gs_lib_ctx_init( gs_memory_t *mem ) + mem->gs_lib_ctx = NULL; + return -1; + } +- ++ pio->client_check_file_permission = NULL; + gp_get_realtime(pio->real_time_0); + + return 0; +@@ -262,3 +262,13 @@ void errflush(const gs_memory_t *mem) + fflush(mem->gs_lib_ctx->fstderr); + /* else nothing to flush */ + } ++ ++int ++gs_check_file_permission (gs_memory_t *mem, const char *fname, const int len, const char *permission) ++{ ++ int code = 0; ++ if (mem->gs_lib_ctx->client_check_file_permission != NULL) { ++ code = mem->gs_lib_ctx->client_check_file_permission(mem, fname, len, permission); ++ } ++ return code; ++} +diff --git a/base/gslibctx.h b/base/gslibctx.h +index 7a4e110..020e2d9 100644 +--- a/base/gslibctx.h ++++ b/base/gslibctx.h +@@ -32,6 +32,9 @@ typedef struct gs_fapi_server_s gs_fapi_server; + # define gs_font_dir_DEFINED + typedef struct gs_font_dir_s gs_font_dir; + #endif ++ ++typedef int (*client_check_file_permission_t) (gs_memory_t *mem, const char *fname, const int len, const char *permission); ++ + typedef struct gs_lib_ctx_s + { + gs_memory_t *memory; /* mem->gs_lib_ctx->memory == mem */ +@@ -59,6 +62,7 @@ typedef struct gs_lib_ctx_s + bool dict_auto_expand; /* ps dictionary: false level 1 true level 2 or 3 */ + /* A table of local copies of the IODevices */ + struct gx_io_device_s **io_device_table; ++ client_check_file_permission_t client_check_file_permission; + /* Define the default value of AccurateScreens that affects setscreen + and setcolorscreen. */ + bool screen_accurate_screens; +@@ -108,6 +112,9 @@ int + void gs_lib_ctx_set_icc_directory(const gs_memory_t *mem_gc, const char* pname, + int dir_namelen); + ++int ++gs_check_file_permission (gs_memory_t *mem, const char *fname, const int len, const char *permission); ++ + #define IS_LIBCTX_STDOUT(mem, f) (f == mem->gs_lib_ctx->fstdout) + #define IS_LIBCTX_STDERR(mem, f) (f == mem->gs_lib_ctx->fstderr) + +diff --git a/psi/imain.c b/psi/imain.c +index 9a9bb5d..6874128 100644 +--- a/psi/imain.c ++++ b/psi/imain.c +@@ -57,6 +57,7 @@ + #include "ivmspace.h" + #include "idisp.h" /* for setting display device callback */ + #include "iplugin.h" ++#include "zfile.h" + + #ifdef PACIFY_VALGRIND + #include "valgrind.h" +@@ -215,6 +216,7 @@ gs_main_init1(gs_main_instance * minst) + "the_gs_name_table"); + if (code < 0) + return code; ++ mem->gs_lib_ctx->client_check_file_permission = z_check_file_permissions; + } + code = obj_init(&minst->i_ctx_p, &idmem); /* requires name_init */ + if (code < 0) +diff --git a/psi/int.mak b/psi/int.mak +index 4654afc..bb30d51 100644 +--- a/psi/int.mak ++++ b/psi/int.mak +@@ -1868,7 +1868,7 @@ $(PSOBJ)imain.$(OBJ) : $(PSSRC)imain.c $(GH) $(memory__h) $(string__h)\ + $(ialloc_h) $(iconf_h) $(idebug_h) $(idict_h) $(idisp_h) $(iinit_h)\ + $(iname_h) $(interp_h) $(iplugin_h) $(isave_h) $(iscan_h) $(ivmspace_h)\ + $(iinit_h) $(main_h) $(oper_h) $(ostack_h)\ +- $(sfilter_h) $(store_h) $(stream_h) $(strimpl_h) ++ $(sfilter_h) $(store_h) $(stream_h) $(strimpl_h) $(zfile_h) + $(PSCC) $(PSO_)imain.$(OBJ) $(C_) $(PSSRC)imain.c + + #****** $(CCINT) interp.c +diff --git a/psi/zfile.c b/psi/zfile.c +index 2c6c958..2f27f82 100644 +--- a/psi/zfile.c ++++ b/psi/zfile.c +@@ -197,6 +197,25 @@ check_file_permissions(i_ctx_t *i_ctx_p, const char *fname, int len, + return check_file_permissions_reduced(i_ctx_p, fname_reduced, rlen, permitgroup); + } + ++/* z_check_file_permissions: see zfile.h for explanation ++ */ ++int ++z_check_file_permissions(gs_memory_t *mem, const char *fname, const int len, const char *permission) ++{ ++ i_ctx_t *i_ctx_p = get_minst_from_memory(mem)->i_ctx_p; ++ gs_parsed_file_name_t pname; ++ const char *permitgroup = permission[0] == 'r' ? "PermitFileReading" : "PermitFileWriting"; ++ int code = gs_parse_file_name(&pname, fname, len, imemory); ++ if (code < 0) ++ return code; ++ ++ if (pname.iodev && i_ctx_p->LockFilePermissions && strcmp(pname.iodev->dname, "%pipe%") == 0) ++ return e_invalidfileaccess; ++ ++ code = check_file_permissions(i_ctx_p, fname, len, permitgroup); ++ return code; ++} ++ + /* <name_string> <access_string> file <file> */ + int /* exported for zsysvm.c */ + zfile(i_ctx_t *i_ctx_p) +diff --git a/psi/zfile.h b/psi/zfile.h +index fdf1373..a9399c7 100644 +--- a/psi/zfile.h ++++ b/psi/zfile.h +@@ -22,4 +22,11 @@ + int zopen_file(i_ctx_t *i_ctx_p, const gs_parsed_file_name_t *pfn, + const char *file_access, stream **ps, gs_memory_t *mem); + ++/* z_check_file_permissions: a callback (via mem->gs_lib_ctx->client_check_file_permission) ++ * to allow applying the above permissions checks when opening file(s) from ++ * the graphics library ++ */ ++int ++z_check_file_permissions(gs_memory_t *mem, const char *fname, ++ const int len, const char *permission); + #endif +-- +2.9.1 + |