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Added fix for CVE-2021-3781

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Resolves: rhbz#2002625
This commit is contained in:
Richard Lescak 2021-09-16 11:55:00 +02:00
parent f044d71dd8
commit 15b456a1e6
2 changed files with 213 additions and 1 deletions
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208
ghostscript-9.54.0-include-pipe-handle-in-validation.patch Normal file
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@ -0,0 +1,208 @@
diff --git a/base/gdevpipe.c b/base/gdevpipe.c
index 96d71f5d81..752a2f1d94 100644
--- a/base/gdevpipe.c
+++ b/base/gdevpipe.c
@@ -72,8 +72,28 @@ pipe_fopen(gx_io_device * iodev, const char *fname, const char *access,
#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);
+ int code1;
+ const size_t preflen = strlen(iodev->dname);
+ const size_t nlen = strlen(fname);
+
+ 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 (gp_validate_path(mem, fname, access) != 0)
+ if (code1 != 0 && gp_validate_path(mem, f, access) != 0 )
return gs_error_invalidfileaccess;
/*
diff --git a/base/gp_mshdl.c b/base/gp_mshdl.c
index 2b964ed749..8d87ceadc0 100644
--- a/base/gp_mshdl.c
+++ b/base/gp_mshdl.c
@@ -95,8 +95,17 @@ mswin_handle_fopen(gx_io_device * iodev, const char *fname, const char *access,
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. */
diff --git a/base/gp_msprn.c b/base/gp_msprn.c
index ed48279685..746a974f78 100644
--- a/base/gp_msprn.c
+++ b/base/gp_msprn.c
@@ -168,8 +168,16 @@ mswin_printer_fopen(gx_io_device * iodev, const char *fname, const char *access,
uintptr_t *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. */
diff --git a/base/gp_os2pr.c b/base/gp_os2pr.c
index f852c71fc8..ba54cde66f 100644
--- a/base/gp_os2pr.c
+++ b/base/gp_os2pr.c
@@ -107,9 +107,20 @@ os2_printer_fopen(gx_io_device * iodev, const char *fname, const char *access,
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
diff --git a/base/gslibctx.c b/base/gslibctx.c
index 6dfed6cd5a..318039fad0 100644
--- a/base/gslibctx.c
+++ b/base/gslibctx.c
@@ -655,82 +655,39 @@ 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, code;
+ 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) {
- 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;
- code = gs_add_control_path(mem, gs_permit_file_control, f);
- if (code < 0)
- return code;
- break;
- }
- if (!IS_WHITESPACE(f[i]))
- break;
- }
- code = gs_add_control_path(mem, gs_permit_file_control, 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, fp);
+ 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, code;
+ 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) {
- 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;
- code = gs_remove_control_path(mem, gs_permit_file_control, f);
- if (code < 0)
- return code;
- break;
- }
- if (!IS_WHITESPACE(f[i]))
- break;
- }
- code = gs_remove_control_path(mem, gs_permit_file_control, 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, fp);
+ return gs_remove_control_path(mem, gs_permit_file_writing, f);
}
int
--
2.17.1

6
ghostscript.spec
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@ -42,7 +42,7 @@
Name: ghostscript
Summary: Interpreter for PostScript language & PDF
Version: 9.54.0
Release: 3%{?dist}
Release: 4%{?dist}
License: AGPLv3+
@ -101,6 +101,7 @@ BuildRequires: make
# ---------------- last rebase that are necessary for any reason:
#Patch000: example000.patch
Patch001: ghostscript-9.54.0-gdevtxtw-null-also-pointers.patch
Patch002: ghostscript-9.54.0-include-pipe-handle-in-validation.patch
# Downstream patches -- these should be always included when doing rebase:
# ------------------
@ -434,6 +435,9 @@ done
# =============================================================================
%changelog
* Thu Sep 16 2021 Richard Lescak <rlescak@redhat.com> - 9.54.0-4
- Added fix for CVE-2021-3781 (#2002625)
* Thu Sep 16 2021 Richard Lescak <rlescak@redhat.com> - 9.54.0-3
- Added fix for segfault bug (#1989084)