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authorEfraim Flashner <efraim@flashner.co.il>2021-03-08 15:48:08 +0200
committerEfraim Flashner <efraim@flashner.co.il>2021-03-08 15:48:08 +0200
commitfe830ffd8d761cee27edd069e3d99c1ab891cbf3 (patch)
treefcc337c4d2588b6fe734e0babe5898e93c0cadbe /gnu/packages/patches
parent612dc6dbe0904f39238a89d3b63ee66abd861b51 (diff)
gnu: libcaca: Patch for CVE-2021-3410.
* gnu/packages/video.scm (libcaca)[source]: Add patches. * gnu/packages/patches/libcaca-CVE-2021-3410-pt1.patch, gnu/packages/patches/libcaca-CVE-2021-3410-pt2.patch: New files. * gnu/local.mk (dist_patch_DATA): Register them.
Diffstat (limited to 'gnu/packages/patches')
-rw-r--r--gnu/packages/patches/libcaca-CVE-2021-3410-pt1.patch137
-rw-r--r--gnu/packages/patches/libcaca-CVE-2021-3410-pt2.patch96
2 files changed, 233 insertions, 0 deletions
diff --git a/gnu/packages/patches/libcaca-CVE-2021-3410-pt1.patch b/gnu/packages/patches/libcaca-CVE-2021-3410-pt1.patch
new file mode 100644
index 0000000000..b23b01d33a
--- /dev/null
+++ b/gnu/packages/patches/libcaca-CVE-2021-3410-pt1.patch
@@ -0,0 +1,137 @@
+https://github.com/cacalabs/libcaca/commit/46b4ea7cea72d6b3ffe65d33e604b1774dcc2bbd.patch
+
+From 46b4ea7cea72d6b3ffe65d33e604b1774dcc2bbd Mon Sep 17 00:00:00 2001
+From: Sam Hocevar <sam@hocevar.net>
+Date: Fri, 26 Feb 2021 10:55:38 +0100
+Subject: [PATCH] canvas: fix an integer overflow in caca_resize().
+
+Fixes: #52 (CVE-2021-3410)
+---
+ caca/canvas.c | 13 +++++++++++--
+ caca/codec/import.c | 1 +
+ caca/codec/text.c | 21 ++++++++++++++-------
+ 3 files changed, 26 insertions(+), 9 deletions(-)
+
+diff --git a/caca/canvas.c b/caca/canvas.c
+index 3fdd37ae..d0715392 100644
+--- a/caca/canvas.c
++++ b/caca/canvas.c
+@@ -45,6 +45,7 @@ static int caca_resize(caca_canvas_t *, int, int);
+ *
+ * If an error occurs, NULL is returned and \b errno is set accordingly:
+ * - \c EINVAL Specified width or height is invalid.
++ * - \c EOVERFLOW Specified width and height overflowed.
+ * - \c ENOMEM Not enough memory for the requested canvas size.
+ *
+ * \param width The desired canvas width
+@@ -200,6 +201,7 @@ int caca_unmanage_canvas(caca_canvas_t *cv, int (*callback)(void *), void *p)
+ *
+ * If an error occurs, -1 is returned and \b errno is set accordingly:
+ * - \c EINVAL Specified width or height is invalid.
++ * - \c EOVERFLOW Specified width and height overflowed.
+ * - \c EBUSY The canvas is in use by a display driver and cannot be resized.
+ * - \c ENOMEM Not enough memory for the requested canvas size. If this
+ * happens, the canvas handle becomes invalid and should not be used.
+@@ -363,7 +365,7 @@ int caca_rand(int min, int max)
+
+ int caca_resize(caca_canvas_t *cv, int width, int height)
+ {
+- int x, y, f, old_width, old_height, new_size, old_size;
++ int x, y, f, old_width, old_height, old_size;
+
+ old_width = cv->width;
+ old_height = cv->height;
+@@ -375,7 +377,14 @@ int caca_resize(caca_canvas_t *cv, int width, int height)
+ * dirty rectangle handling */
+ cv->width = width;
+ cv->height = height;
+- new_size = width * height;
++ int new_size = width * height;
++
++ /* Check for overflow */
++ if (new_size / width != height)
++ {
++ seterrno(EOVERFLOW);
++ return -1;
++ }
+
+ /* If width or height is smaller (or both), we have the opportunity to
+ * reduce or even remove dirty rectangles */
+diff --git a/caca/codec/import.c b/caca/codec/import.c
+index 8836fd08..2dafe3cf 100644
+--- a/caca/codec/import.c
++++ b/caca/codec/import.c
+@@ -61,6 +61,7 @@ static ssize_t import_caca(caca_canvas_t *, void const *, size_t);
+ *
+ * If an error occurs, -1 is returned and \b errno is set accordingly:
+ * - \c ENOMEM Not enough memory to allocate canvas.
++ * - \c EOVERFLOW Importing data caused a value overflow.
+ * - \c EINVAL Invalid format requested.
+ *
+ * \param cv A libcaca canvas in which to import the file.
+diff --git a/caca/codec/text.c b/caca/codec/text.c
+index 358b7224..94a2a4d7 100644
+--- a/caca/codec/text.c
++++ b/caca/codec/text.c
+@@ -46,7 +46,7 @@ ssize_t _import_text(caca_canvas_t *cv, void const *data, size_t size)
+ char const *text = (char const *)data;
+ unsigned int width = 0, height = 0, x = 0, y = 0, i;
+
+- caca_set_canvas_size(cv, width, height);
++ caca_set_canvas_size(cv, 0, 0);
+
+ for(i = 0; i < size; i++)
+ {
+@@ -70,15 +70,19 @@ ssize_t _import_text(caca_canvas_t *cv, void const *data, size_t size)
+ if(y >= height)
+ height = y + 1;
+
+- caca_set_canvas_size(cv, width, height);
++ if (caca_set_canvas_size(cv, width, height) < 0)
++ return -1;
+ }
+
+ caca_put_char(cv, x, y, ch);
+ x++;
+ }
+
+- if(y > height)
+- caca_set_canvas_size(cv, width, height = y);
++ if (y > height)
++ {
++ if (caca_set_canvas_size(cv, width, height = y) < 0)
++ return -1;
++ }
+
+ return (ssize_t)size;
+ }
+@@ -431,7 +435,8 @@ ssize_t _import_ansi(caca_canvas_t *cv, void const *data, size_t size, int utf8)
+ {
+ savedattr = caca_get_attr(cv, -1, -1);
+ caca_set_attr(cv, im.clearattr);
+- caca_set_canvas_size(cv, width = x + wch, height);
++ if (caca_set_canvas_size(cv, width = x + wch, height) < 0)
++ return -1;
+ caca_set_attr(cv, savedattr);
+ }
+ else
+@@ -448,7 +453,8 @@ ssize_t _import_ansi(caca_canvas_t *cv, void const *data, size_t size, int utf8)
+ caca_set_attr(cv, im.clearattr);
+ if(growy)
+ {
+- caca_set_canvas_size(cv, width, height = y + 1);
++ if (caca_set_canvas_size(cv, width, height = y + 1) < 0)
++ return -1;
+ }
+ else
+ {
+@@ -480,7 +486,8 @@ ssize_t _import_ansi(caca_canvas_t *cv, void const *data, size_t size, int utf8)
+ {
+ savedattr = caca_get_attr(cv, -1, -1);
+ caca_set_attr(cv, im.clearattr);
+- caca_set_canvas_size(cv, width, height = y);
++ if (caca_set_canvas_size(cv, width, height = y))
++ return -1;
+ caca_set_attr(cv, savedattr);
+ }
+
diff --git a/gnu/packages/patches/libcaca-CVE-2021-3410-pt2.patch b/gnu/packages/patches/libcaca-CVE-2021-3410-pt2.patch
new file mode 100644
index 0000000000..e6fd506b37
--- /dev/null
+++ b/gnu/packages/patches/libcaca-CVE-2021-3410-pt2.patch
@@ -0,0 +1,96 @@
+https://github.com/cacalabs/libcaca/commit/e4968ba6e93e9fd35429eb16895c785c51072015.patch
+Patch adjusted to remove the lines modifying caca/t/canvas.cpp. This file does not exist in the current release.
+
+From e4968ba6e93e9fd35429eb16895c785c51072015 Mon Sep 17 00:00:00 2001
+From: Sam Hocevar <sam@hocevar.net>
+Date: Fri, 26 Feb 2021 12:40:06 +0100
+Subject: [PATCH] Fix a problem in the caca_resize() overflow detection and add
+ several unit tests.
+
+---
+ caca/canvas.c | 16 ++++++++--------
+ caca/t/canvas.cpp | 18 +++++++++++++++---
+ tools/makefont.c | 22 +++++++++++++++++++---
+ 3 files changed, 42 insertions(+), 14 deletions(-)
+
+diff --git a/caca/canvas.c b/caca/canvas.c
+index d0715392..08c628c9 100644
+--- a/caca/canvas.c
++++ b/caca/canvas.c
+@@ -367,6 +367,14 @@ int caca_resize(caca_canvas_t *cv, int width, int height)
+ {
+ int x, y, f, old_width, old_height, old_size;
+
++ /* Check for overflow */
++ int new_size = width * height;
++ if (new_size < 0 || (width > 0 && new_size / width != height))
++ {
++ seterrno(EOVERFLOW);
++ return -1;
++ }
++
+ old_width = cv->width;
+ old_height = cv->height;
+ old_size = old_width * old_height;
+@@ -377,14 +385,6 @@ int caca_resize(caca_canvas_t *cv, int width, int height)
+ * dirty rectangle handling */
+ cv->width = width;
+ cv->height = height;
+- int new_size = width * height;
+-
+- /* Check for overflow */
+- if (new_size / width != height)
+- {
+- seterrno(EOVERFLOW);
+- return -1;
+- }
+
+ /* If width or height is smaller (or both), we have the opportunity to
+ * reduce or even remove dirty rectangles */
+diff --git a/tools/makefont.c b/tools/makefont.c
+index 226c8838..66718605 100644
+--- a/tools/makefont.c
++++ b/tools/makefont.c
+@@ -40,7 +40,8 @@
+ * and the UTF-8 glyphs necessary for canvas rotation and mirroring. */
+ static unsigned int const blocklist[] =
+ {
+- 0x0000, 0x0080, /* Basic latin: A, B, C, a, b, c */
++ 0x0020, 0x0080, /* Basic latin: A, B, C, a, b, c */
++#if 0
+ 0x0080, 0x0100, /* Latin-1 Supplement: Ä, Ç, å, ß */
+ 0x0100, 0x0180, /* Latin Extended-A: Ā č Ō œ */
+ 0x0180, 0x0250, /* Latin Extended-B: Ǝ Ƹ */
+@@ -63,6 +64,7 @@ static unsigned int const blocklist[] =
+ 0x30a0, 0x3100, /* Katakana: ロ ル */
+ 0xff00, 0xfff0, /* Halfwidth and Fullwidth Forms: A, B, C, a, b, c */
+ 0x10400, 0x10450, /* Deseret: 𐐒 𐐋 */
++#endif
+ 0, 0
+ };
+
+@@ -317,8 +319,22 @@ int main(int argc, char *argv[])
+ printf_unicode(&gtab[n]);
+
+ if(gtab[n].same_as == n)
+- printf_hex(" */ %s\n",
+- glyph_data + gtab[n].data_offset, gtab[n].data_size);
++ {
++ char const *lut = " .:nmW@";
++ printf("\n");
++ for (int y = 0; y < height; ++y)
++ {
++ for (int x = 0; x < gtab[n].data_width; ++x)
++ {
++ int val = glyph_data[gtab[n].data_offset + y * gtab[n].data_width + x];
++ char ch = lut[val * val * 7 / 256 / 256];
++ printf("%c%c", ch, ch);
++ }
++ printf("\n");
++ }
++ //printf_hex(" */ %s\n",
++ // glyph_data + gtab[n].data_offset, gtab[n].data_size);
++ }
+ else
+ {
+ printf(" is ");