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* [glibc/google/grte/v5-2.27/master] iconv: Accept redundant shift sequences in IBM1364 [BZ #26224]
@ 2021-07-23 17:07 Stan Shebs
0 siblings, 0 replies; 2+ messages in thread
From: Stan Shebs @ 2021-07-23 17:07 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=9babbdefdcda0df4a7772c0b7896e7c3f0d3e12a
commit 9babbdefdcda0df4a7772c0b7896e7c3f0d3e12a
Author: Arjun Shankar <arjun@redhat.com>
Date: Wed Nov 4 12:19:38 2020 +0100
iconv: Accept redundant shift sequences in IBM1364 [BZ #26224]
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 692de4b3960d).
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diff:
---
iconvdata/ibm1364.c | 14 ++------------
1 file changed, 2 insertions(+), 12 deletions(-)
diff --git a/iconvdata/ibm1364.c b/iconvdata/ibm1364.c
index b833273aa8..27900c4307 100644
--- a/iconvdata/ibm1364.c
+++ b/iconvdata/ibm1364.c
@@ -157,24 +157,14 @@ 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; \
^ permalink raw reply [flat|nested] 2+ messages in thread
* [glibc/google/grte/v5-2.27/master] iconv: Accept redundant shift sequences in IBM1364 [BZ #26224]
@ 2021-08-28 0:40 Fangrui Song
0 siblings, 0 replies; 2+ messages in thread
From: Fangrui Song @ 2021-08-28 0:40 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=77d2c2fd0d8245ce729ae7d3ba97279a4afc845a
commit 77d2c2fd0d8245ce729ae7d3ba97279a4afc845a
Author: Arjun Shankar <arjun@redhat.com>
Date: Wed Nov 4 12:19:38 2020 +0100
iconv: Accept redundant shift sequences in IBM1364 [BZ #26224]
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 692de4b3960d).
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diff:
---
iconvdata/ibm1364.c | 14 ++------------
1 file changed, 2 insertions(+), 12 deletions(-)
diff --git a/iconvdata/ibm1364.c b/iconvdata/ibm1364.c
index b833273aa8..27900c4307 100644
--- a/iconvdata/ibm1364.c
+++ b/iconvdata/ibm1364.c
@@ -157,24 +157,14 @@ 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; \
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-07-23 17:07 [glibc/google/grte/v5-2.27/master] iconv: Accept redundant shift sequences in IBM1364 [BZ #26224] Stan Shebs
2021-08-28 0:40 Fangrui Song
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