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-rw-r--r--meta/recipes-extended/screen/screen/CVE-2021-26937.patch68
-rw-r--r--meta/recipes-extended/screen/screen_4.8.0.bb1
2 files changed, 69 insertions, 0 deletions
diff --git a/meta/recipes-extended/screen/screen/CVE-2021-26937.patch b/meta/recipes-extended/screen/screen/CVE-2021-26937.patch
new file mode 100644
index 0000000000..983b35c1b0
--- /dev/null
+++ b/meta/recipes-extended/screen/screen/CVE-2021-26937.patch
@@ -0,0 +1,68 @@
1Description: [CVE-2021-26937] Fix out of bounds array access
2Author: Michael Schröder <mls@suse.de>
3Bug-Debian: https://bugs.debian.org/982435
4Bug: https://savannah.gnu.org/bugs/?60030
5Bug: https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00000.html
6Bug-OSS-Security: https://www.openwall.com/lists/oss-security/2021/02/09/3
7Origin: https://lists.gnu.org/archive/html/screen-devel/2021-02/msg00010.html
8
9CVE: CVE-2021-26937
10Upstream-Status: Pending
11Signed-off-by: Scott Murray <scott.murray@konsulko.com>
12
13--- a/encoding.c
14+++ b/encoding.c
15@@ -43,7 +43,7 @@
16 # ifdef UTF8
17 static int recode_char __P((int, int, int));
18 static int recode_char_to_encoding __P((int, int));
19-static void comb_tofront __P((int, int));
20+static void comb_tofront __P((int));
21 # ifdef DW_CHARS
22 static int recode_char_dw __P((int, int *, int, int));
23 static int recode_char_dw_to_encoding __P((int, int *, int));
24@@ -1263,6 +1263,8 @@
25 {0x30000, 0x3FFFD},
26 };
27
28+ if (c >= 0xdf00 && c <= 0xdfff)
29+ return 1; /* dw combining sequence */
30 return ((bisearch(c, wide, sizeof(wide) / sizeof(struct interval) - 1)) ||
31 (cjkwidth &&
32 bisearch(c, ambiguous,
33@@ -1330,11 +1332,12 @@
34 }
35
36 static void
37-comb_tofront(root, i)
38-int root, i;
39+comb_tofront(i)
40+int i;
41 {
42 for (;;)
43 {
44+ int root = i >= 0x700 ? 0x801 : 0x800;
45 debug1("bring to front: %x\n", i);
46 combchars[combchars[i]->prev]->next = combchars[i]->next;
47 combchars[combchars[i]->next]->prev = combchars[i]->prev;
48@@ -1396,9 +1399,9 @@
49 {
50 /* full, recycle old entry */
51 if (c1 >= 0xd800 && c1 < 0xe000)
52- comb_tofront(root, c1 - 0xd800);
53+ comb_tofront(c1 - 0xd800);
54 i = combchars[root]->prev;
55- if (c1 == i + 0xd800)
56+ if (i == 0x800 || i == 0x801 || c1 == i + 0xd800)
57 {
58 /* completely full, can't recycle */
59 debug("utf8_handle_comp: completely full!\n");
60@@ -1422,7 +1425,7 @@
61 mc->font = (i >> 8) + 0xd8;
62 mc->fontx = 0;
63 debug3("combinig char %x %x -> %x\n", c1, c, i + 0xd800);
64- comb_tofront(root, i);
65+ comb_tofront(i);
66 }
67
68 #else /* !UTF8 */
diff --git a/meta/recipes-extended/screen/screen_4.8.0.bb b/meta/recipes-extended/screen/screen_4.8.0.bb
index 4772eb6c7a..fe640c262b 100644
--- a/meta/recipes-extended/screen/screen_4.8.0.bb
+++ b/meta/recipes-extended/screen/screen_4.8.0.bb
@@ -21,6 +21,7 @@ SRC_URI = "${GNU_MIRROR}/screen/screen-${PV}.tar.gz \
21 file://0002-comm.h-now-depends-on-term.h.patch \ 21 file://0002-comm.h-now-depends-on-term.h.patch \
22 file://0001-fix-for-multijob-build.patch \ 22 file://0001-fix-for-multijob-build.patch \
23 file://0001-Remove-more-compatibility-stuff.patch \ 23 file://0001-Remove-more-compatibility-stuff.patch \
24 file://CVE-2021-26937.patch \
24 " 25 "
25 26
26SRC_URI[md5sum] = "d276213d3acd10339cd37848b8c4ab1e" 27SRC_URI[md5sum] = "d276213d3acd10339cd37848b8c4ab1e"