/* * ZDI-CAN-30559: PCF RepadBitmap heap buffer overflow * * The font declares a tiny bitmapSizes[2] (for pad=4, 16 bytes) but has * per-glyph metrics (200x20) that cause RepadBitmap to write 560 bytes. * Without the fix, this overflows the allocated buffer by 544 bytes. * * With the fix in pcfread.c, the library computes the required buffer * size from per-glyph metrics instead of trusting bitmapSizes[]. * * Test font: test/data/repad/evil-repad.pcf * Generated by: test/gen_evil_pcf_repad.py */ /* * Copyright (c) 2026, Red Hat, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ #include "pcf-test-common.h" #include #include int main(int argc, char **argv) { xfont2_fpe_funcs_rec const **fpe_functions; int fpe_function_count; const char *builddir; char fontdir[512]; builddir = getenv("builddir"); if (!builddir) builddir = "."; fpe_functions = pcf_test_init(&fpe_function_count); snprintf(fontdir, sizeof(fontdir), "%s/test/data/repad", builddir); return pcf_test_open_font(fpe_functions, "ZDI-CAN-30559-repad", fontdir, "-evil-repad-medium-r-normal--10-100-75-75-c-80-iso10646-1"); }