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gnuplot/gnuplot-e3cc539c.patch

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From e3cc539c23ceb1640395236248f0ab5a26397557 Mon Sep 17 00:00:00 2001
From: Ethan A Merritt <merritt@u.washington.edu>
Date: Mon, 19 Nov 2018 11:35:25 -0800
Subject: [PATCH] various overflow cases found by fuzzing
Credits:
Tim Blazytko
Cornelius Aschermann
Sergej Schumilo
Nils Bars
Bug 2088: term.c(strlen_tex)
Bug 2089: cairo.trm metapost.trm tgif.trm (arbitrarily long font name)
Bug 2092: cgm.trm overwrites trailing '\0' in default font name
also context.trm emf.trm
Bug 2094: also post.trm
Bug 2093: datafile.c expand df_line on input as necessary to hold string data
Bug 2095: eepic.trm (EEPIC_put_text) ignore request to print empty string
---
src/datafile.c | 11 +++++++----
src/set.c | 4 ++--
src/term.c | 2 +-
term/cairo.trm | 2 +-
term/cgm.trm | 9 ++-------
term/context.trm | 4 ++--
term/eepic.trm | 3 +++
term/emf.trm | 4 ++--
term/metapost.trm | 2 +-
term/post.trm | 2 +-
term/tgif.trm | 2 +-
11 files changed, 23 insertions(+), 22 deletions(-)
--- src/datafile.c
+++ src/datafile.c 2018-11-28 11:12:55.899231134 +0000
@@ -5622,10 +5622,13 @@ df_generate_ascii_array_entry()
return NULL;
entry = &(df_array->udv_value.v.value_array[df_array_index]);
- if (entry->type == STRING)
- sprintf(df_line, "%d \"%s\"", df_array_index, entry->v.string_val);
- else
- sprintf(df_line, "%d %g", df_array_index, real(entry));
+ if (entry->type == STRING) {
+ while (max_line_len < strlen(entry->v.string_val))
+ df_line = gp_realloc(df_line, max_line_len *= 2, "datafile line buffer");
+ snprintf(df_line, max_line_len-1, "%d \"%s\"", df_array_index, entry->v.string_val);
+ } else {
+ snprintf(df_line, max_line_len-1, "%d %g", df_array_index, real(entry));
+ }
return df_line;
}
--- src/set.c
+++ src/set.c 2018-11-28 11:12:55.899231134 +0000
@@ -1163,7 +1163,7 @@ set_clabel()
c_token++;
clabel_onecolor = FALSE;
if ((new_format = try_to_get_string())) {
- strncpy(contour_format, new_format, sizeof(contour_format));
+ safe_strncpy(contour_format, new_format, sizeof(contour_format));
free(new_format);
}
}
@@ -1319,7 +1319,7 @@ set_cntrlabel()
char *new;
c_token++;
if ((new = try_to_get_string()))
- strncpy(contour_format,new,sizeof(contour_format));
+ safe_strncpy(contour_format,new,sizeof(contour_format));
free(new);
} else if (equals(c_token, "font")) {
char *ctmp;
--- src/term.c
+++ src/term.c 2018-11-28 11:12:55.903231061 +0000
@@ -2956,7 +2956,7 @@ strlen_tex(const char *str)
switch (*s) {
case '[':
while (*s && *s != ']') s++;
- s++;
+ if (*s) s++;
break;
case '\\':
s++;
--- term/cairo.trm
+++ term/cairo.trm 2018-11-28 11:12:55.903231061 +0000
@@ -295,7 +295,7 @@ TERM_PUBLIC void cairotrm_options()
cairo_params->fontsize = 0;
} else {
sep = strcspn(s,",");
- if (sep > 0) {
+ if (0 < sep && sep < MAX_ID_LEN) {
strncpy(cairo_params->fontname, s, sep);
cairo_params->fontname[sep] = '\0';
}
--- term/cgm.trm
+++ term/cgm.trm 2018-11-28 11:12:55.903231061 +0000
@@ -473,7 +473,7 @@ CGM_options()
font_index = 1;
} else
free(s);
- strncpy(cgm_font, cgm_font_data[font_index-1].name, sizeof(cgm_font));
+ safe_strncpy(cgm_font, cgm_font_data[font_index-1].name, sizeof(cgm_font));
} else {
/* the user is specifying the font size */
@@ -830,12 +830,7 @@ CGM_set_font(const char *font)
{
char *s = cgm_font_data[font_index-1].name;
-
- len = strlen(s);
- if (len > 31)
- len = 31;
- strncpy(cgm_font, s, len);
- cgm_font[len] = NUL;
+ safe_strncpy(cgm_font, s, sizeof(cgm_font));
}
/* set font size */
--- term/context.trm
+++ term/context.trm 2018-11-28 11:12:55.903231061 +0000
@@ -593,7 +593,7 @@ CONTEXT_options()
if ((tmp_string = try_to_get_string()) && (tmp_string != NULL)) {
CONTEXT_fontstring_parse(tmp_string, tmp_font, MAX_ID_LEN+1, &tmp_fontsize);
/* copies font name to parameters */
- strncpy(CONTEXT_params.font, tmp_font, sizeof(CONTEXT_params.font));
+ safe_strncpy(CONTEXT_params.font, tmp_font, sizeof(CONTEXT_params.font));
tmp_font[MAX_ID_LEN] = NUL;
free(tmp_string);
/* save font size:
@@ -1379,7 +1379,7 @@ CONTEXT_set_font(const char *font)
/* saves font name & family to CONTEXT_font */
CONTEXT_fontstring_parse((char *)font, CONTEXT_font, sizeof(CONTEXT_font), &CONTEXT_fontsize_explicit);
- strncpy(CONTEXT_font_explicit, CONTEXT_font, sizeof(CONTEXT_font_explicit));
+ safe_strncpy(CONTEXT_font_explicit, CONTEXT_font, sizeof(CONTEXT_font_explicit));
/* valid fontsize has been provided */
if (CONTEXT_fontsize_explicit > 0.) { /* XXX: if valid */
--- term/eepic.trm
+++ term/eepic.trm 2018-11-28 11:12:55.903231061 +0000
@@ -375,6 +375,9 @@ EEPIC_put_text(unsigned int x, unsigned
{
int i, l;
+ if (*str == '\0')
+ return;
+
EEPIC_endline();
fprintf(gpoutfile, "\\put(%d,%d)", x, y);
--- term/emf.trm
+++ term/emf.trm 2018-11-28 11:12:55.903231061 +0000
@@ -790,7 +790,7 @@ EMF_options()
*comma = '\0';
}
if (*s)
- strncpy(emf_defaultfontname, s, sizeof(emf_defaultfontname));
+ safe_strncpy(emf_defaultfontname, s, sizeof(emf_defaultfontname));
free(s);
if (isanumber(c_token)) {
emf_defaultfontsize = int_expression();
@@ -1865,7 +1865,7 @@ ENHemf_put_text(unsigned int x, unsigned
/* set up the global variables needed by enhanced_recursion() */
enhanced_fontscale = 1.0;
- strncpy(enhanced_escape_format,"&#x%2.2x;",sizeof(enhanced_escape_format));
+ safe_strncpy(enhanced_escape_format,"&#x%2.2x;",sizeof(enhanced_escape_format));
ENHemf_opened_string = FALSE;
ENHemf_overprint = 0;
--- term/metapost.trm
+++ term/metapost.trm 2018-11-28 11:12:55.903231061 +0000
@@ -320,7 +320,7 @@ MP_options()
char *s;
if ((s = try_to_get_string())) {
int sep = strcspn(s,",");
- if (sep > 0) {
+ if (0 < sep && sep < sizeof(MP_fontname)) {
strncpy(MP_fontname, s, sizeof(MP_fontname));
MP_fontname[sep] = '\0';
}
--- term/post.trm
+++ term/post.trm 2018-11-28 11:14:28.889527841 +0000
@@ -1194,7 +1194,7 @@ PS_options()
term->h_char = (unsigned int)(ps_fontsize*PS_SCF*5/10);
else
term->h_char = (unsigned int)(ps_fontsize*PS_SCF*6/10);
- sprintf(PS_default_font,"%s,%g",ps_params->font,ps_fontsize);
+ snprintf(PS_default_font, sizeof(PS_default_font)-1, "%s, %.2g", ps_params->font, ps_fontsize);
if (ps_params->terminal == PSTERM_POSTSCRIPT) {
if (ps_params->first_fontfile) {
--- term/tgif.trm
+++ term/tgif.trm 2018-11-28 11:12:55.903231061 +0000
@@ -369,7 +369,7 @@ TGIF_options()
int sep = strcspn(s,",");
if (s[sep] == ',' && (1 == sscanf(&s[sep+1],"%lf",&fontsize)))
uActFontSize = (int)(fontsize+0.5);
- if (sep > 0) {
+ if (0 < sep && sep < sizeof(sActFont)) {
strncpy(sActFont, s, sizeof(sActFont));
sActFont[sep] = NUL;
}
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