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iconv: Accept redundant shift sequences in IBM1364 [BZ #26224]

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The IBM1364, IBM1371, IBM1388, IBM1390 and IBM1399 character sets
share converter logic (iconvdata/ibm1364.c) which would reject
redundant shift sequences when processing input in these character
sets.  This led to a hang in the iconv program (CVE-2020-27618).

This commit adjusts the converter to ignore redundant shift sequences
and adds test cases for iconv_prog hangs that would be triggered upon
their rejection.  This brings the implementation in line with other
converters that also ignore redundant shift sequences (e.g. IBM930
etc., fixed in commit 692de4b396).

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit 9a99c68214)
This commit is contained in:
Arjun Shankar 2020-11-04 12:19:38 +01:00 committed by Aurelien Jarno
parent ac0a6929c5
commit 050022910b
3 changed files with 18 additions and 18 deletions
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6
NEWS
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@ -7,6 +7,8 @@ using `glibc' in the "product" field.
The following bugs are resolved with this release:
[26224] iconv hangs when converting some invalid inputs from several IBM
character sets (CVE-2020-27618)
[26534] libm.so 2.32 SIGILL in pow() due to FMA4 instruction on non-FMA4
system
[26555] string: strerrorname_np does not return the documented value
@ -199,6 +201,10 @@ Security related changes:
Dytrych of the Cisco Security Assessment and Penetration Team (See
TALOS-2020-1019).
CVE-2020-27618: An infinite loop has been fixed in the iconv program when
invoked with input containing redundant shift sequences in the IBM1364,
IBM1371, IBM1388, IBM1390, or IBM1399 character sets.
The following bugs are resolved with this release:
[9809] localedata: ckb_IQ: new Kurdish Sorani locale

16
iconv/tst-iconv_prog.sh
View File

@ -102,12 +102,16 @@ hangarray=(
"\x00\x80;-c;IBM1161;UTF-8//TRANSLIT//IGNORE"
"\x00\xdb;-c;IBM1162;UTF-8//TRANSLIT//IGNORE"
"\x00\x70;-c;IBM12712;UTF-8//TRANSLIT//IGNORE"
# These are known hangs that are yet to be fixed:
# "\x00\x0f;-c;IBM1364;UTF-8"
# "\x00\x0f;-c;IBM1371;UTF-8"
# "\x00\x0f;-c;IBM1388;UTF-8"
# "\x00\x0f;-c;IBM1390;UTF-8"
# "\x00\x0f;-c;IBM1399;UTF-8"
"\x00\x0f;-c;IBM1364;UTF-8"
"\x0e\x0e;-c;IBM1364;UTF-8"
"\x00\x0f;-c;IBM1371;UTF-8"
"\x0e\x0e;-c;IBM1371;UTF-8"
"\x00\x0f;-c;IBM1388;UTF-8"
"\x0e\x0e;-c;IBM1388;UTF-8"
"\x00\x0f;-c;IBM1390;UTF-8"
"\x0e\x0e;-c;IBM1390;UTF-8"
"\x00\x0f;-c;IBM1399;UTF-8"
"\x0e\x0e;-c;IBM1399;UTF-8"
"\x00\x53;-c;IBM16804;UTF-8//TRANSLIT//IGNORE"
"\x00\x41;-c;IBM274;UTF-8//TRANSLIT//IGNORE"
"\x00\x41;-c;IBM275;UTF-8//TRANSLIT//IGNORE"

14
iconvdata/ibm1364.c
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@ -158,24 +158,14 @@ enum
\
if (__builtin_expect (ch, 0) == SO) \
{ \
/* Shift OUT, change to DBCS converter. */ \
if (curcs == db) \
{ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
/* Shift OUT, change to DBCS converter (redundant escape okay). */ \
curcs = db; \
++inptr; \
continue; \
} \
if (__builtin_expect (ch, 0) == SI) \
{ \
/* Shift IN, change to SBCS converter. */ \
if (curcs == sb) \
{ \
result = __GCONV_ILLEGAL_INPUT; \
break; \
} \
/* Shift IN, change to SBCS converter (redundant escape okay). */ \
curcs = sb; \
++inptr; \
continue; \