File CVE-2021-3781.patch of Package ghostscript.29958
--- base/gdevpipe.c.orig 2020-03-19 09:21:42.000000000 +0100
+++ base/gdevpipe.c 2021-09-10 08:35:22.681027130 +0200
@@ -66,8 +66,28 @@ pipe_fopen(gx_io_device * iodev, const c
#else
gs_lib_ctx_t *ctx = mem->gs_lib_ctx;
gs_fs_list_t *fs = ctx->core->fs;
+ /* The pipe device can be reached in two ways, explicltly with %pipe%
+ or implicitly with "|", so we have to check for both
+ */
+ char f[gp_file_name_sizeof];
+ const char *pipestr = "|";
+ const size_t pipestrlen = strlen(pipestr);
+ const size_t preflen = strlen(iodev->dname);
+ const size_t nlen = strlen(fname);
+ int code1;
- if (gp_validate_path(mem, fname, access) != 0)
+ if (preflen + nlen >= gp_file_name_sizeof)
+ return_error(gs_error_invalidaccess);
+
+ memcpy(f, iodev->dname, preflen);
+ memcpy(f + preflen, fname, nlen + 1);
+
+ code1 = gp_validate_path(mem, f, access);
+
+ memcpy(f, pipestr, pipestrlen);
+ memcpy(f + pipestrlen, fname, nlen + 1);
+
+ if (code1 != 0 && gp_validate_path(mem, f, access) != 0 )
return gs_error_invalidfileaccess;
/*
--- base/gp_os2pr.c.orig 2020-03-19 09:21:42.000000000 +0100
+++ base/gp_os2pr.c 2021-09-10 08:35:22.681027130 +0200
@@ -107,9 +107,20 @@ os2_printer_fopen(gx_io_device * iodev,
FILE ** pfile, char *rfname, uint rnamelen)
{
os2_printer_t *pr = (os2_printer_t *)iodev->state;
- char driver_name[256];
+ char driver_name[gp_file_name_sizeof];
gs_lib_ctx_t *ctx = mem->gs_lib_ctx;
gs_fs_list_t *fs = ctx->core->fs;
+ const size_t preflen = strlen(iodev->dname);
+ const int size_t = strlen(fname);
+
+ if (preflen + nlen >= gp_file_name_sizeof)
+ return_error(gs_error_invalidaccess);
+
+ memcpy(driver_name, iodev->dname, preflen);
+ memcpy(driver_name + preflen, fname, nlen + 1);
+
+ if (gp_validate_path(mem, driver_name, access) != 0)
+ return gs_error_invalidfileaccess;
/* First we try the open_printer method. */
/* Note that the loop condition here ensures we don't
--- base/gp_msprn.c.orig 2020-03-19 09:21:42.000000000 +0100
+++ base/gp_msprn.c 2021-09-10 08:35:22.681027130 +0200
@@ -168,8 +168,16 @@ mswin_printer_fopen(gx_io_device * iodev
unsigned long *ptid = &((tid_t *)(iodev->state))->tid;
gs_lib_ctx_t *ctx = mem->gs_lib_ctx;
gs_fs_list_t *fs = ctx->core->fs;
+ const size_t preflen = strlen(iodev->dname);
+ const size_t nlen = strlen(fname);
- if (gp_validate_path(mem, fname, access) != 0)
+ if (preflen + nlen >= gp_file_name_sizeof)
+ return_error(gs_error_invalidaccess);
+
+ memcpy(pname, iodev->dname, preflen);
+ memcpy(pname + preflen, fname, nlen + 1);
+
+ if (gp_validate_path(mem, pname, access) != 0)
return gs_error_invalidfileaccess;
/* First we try the open_printer method. */
--- base/gp_mshdl.c.orig 2020-03-19 09:21:42.000000000 +0100
+++ base/gp_mshdl.c 2021-09-10 08:35:22.681027130 +0200
@@ -95,8 +95,17 @@ mswin_handle_fopen(gx_io_device * iodev,
long hfile; /* Correct for Win32, may be wrong for Win64 */
gs_lib_ctx_t *ctx = mem->gs_lib_ctx;
gs_fs_list_t *fs = ctx->core->fs;
+ char f[gp_file_name_sizeof];
+ const size_t preflen = strlen(iodev->dname);
+ const size_t nlen = strlen(fname);
- if (gp_validate_path(mem, fname, access) != 0)
+ if (preflen + nlen >= gp_file_name_sizeof)
+ return_error(gs_error_invalidaccess);
+
+ memcpy(f, iodev->dname, preflen);
+ memcpy(f + preflen, fname, nlen + 1);
+
+ if (gp_validate_path(mem, f, access) != 0)
return gs_error_invalidfileaccess;
/* First we try the open_handle method. */
--- base/gslibctx.c.orig 2021-09-10 08:35:22.681027130 +0200
+++ base/gslibctx.c 2021-09-10 08:50:41.892424607 +0200
@@ -635,74 +635,39 @@ rewrite_percent_specifiers(char *s)
int
gs_add_outputfile_control_path(gs_memory_t *mem, const char *fname)
{
- char *fp, f[gp_file_name_sizeof];
- const int pipe = 124; /* ASCII code for '|' */
- const int len = strlen(fname);
- int i;
+ char f[gp_file_name_sizeof];
+ int code;
/* Be sure the string copy will fit */
- if (len >= gp_file_name_sizeof)
+ if (strlen(fname) >= gp_file_name_sizeof)
return gs_error_rangecheck;
strcpy(f, fname);
- fp = f;
/* Try to rewrite any %d (or similar) in the string */
rewrite_percent_specifiers(f);
- for (i = 0; i < len; i++) {
- if (f[i] == pipe) {
- int code;
-
- fp = &f[i + 1];
- /* Because we potentially have to check file permissions at two levels
- for the output file (gx_device_open_output_file and the low level
- fopen API, if we're using a pipe, we have to add both the full string,
- (including the '|', and just the command to which we pipe - since at
- the pipe_fopen(), the leading '|' has been stripped.
- */
- code = gs_add_control_path(mem, gs_permit_file_writing, f);
- if (code < 0)
- return code;
- break;
- }
- if (!IS_WHITESPACE(f[i]))
- break;
- }
- return gs_add_control_path(mem, gs_permit_file_writing, fp);
+
+ code = gs_add_control_path(mem, gs_permit_file_control, f);
+ if (code < 0)
+ return code;
+ return gs_add_control_path(mem, gs_permit_file_writing, f);
}
int
gs_remove_outputfile_control_path(gs_memory_t *mem, const char *fname)
{
- char *fp, f[gp_file_name_sizeof];
- const int pipe = 124; /* ASCII code for '|' */
- const int len = strlen(fname);
- int i;
+ char f[gp_file_name_sizeof];
+ int code;
/* Be sure the string copy will fit */
- if (len >= gp_file_name_sizeof)
+ if (strlen(fname) >= gp_file_name_sizeof)
return gs_error_rangecheck;
strcpy(f, fname);
- fp = f;
/* Try to rewrite any %d (or similar) in the string */
- for (i = 0; i < len; i++) {
- if (f[i] == pipe) {
- int code;
-
- fp = &f[i + 1];
- /* Because we potentially have to check file permissions at two levels
- for the output file (gx_device_open_output_file and the low level
- fopen API, if we're using a pipe, we have to add both the full string,
- (including the '|', and just the command to which we pipe - since at
- the pipe_fopen(), the leading '|' has been stripped.
- */
- code = gs_remove_control_path(mem, gs_permit_file_writing, f);
- if (code < 0)
- return code;
- break;
- }
- if (!IS_WHITESPACE(f[i]))
- break;
- }
- return gs_remove_control_path(mem, gs_permit_file_writing, fp);
+ rewrite_percent_specifiers(f);
+
+ code = gs_remove_control_path(mem, gs_permit_file_control, f);
+ if (code < 0)
+ return code;
+ return gs_remove_control_path(mem, gs_permit_file_writing, f);
}
int
