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Copy&paste of the requested patch:
"""
diff -up ksh-20120801/src/lib/libast/misc/stk.c.orig ksh-20120801/src/lib/libast/misc/stk.c
--- ksh-20120801/src/lib/libast/misc/stk.c.orig 2022-01-31 16:06:11.923069379 -0300
+++ ksh-20120801/src/lib/libast/misc/stk.c 2022-01-31 16:06:54.896802455 -0300
@@ -76,7 +76,7 @@ struct frame
struct stk
{
_stk_overflow_ stkoverflow; /* called when malloc fails */
- short stkref; /* reference count; */
+ int stkref; /* reference count; */
short stkflags; /* stack attributes */
char *stkbase; /* beginning of current stack frame */
char *stkend; /* end of current stack frame */
"""
In bz#2007364 we had ksh patched to use the stack robustness
patch. It "almost" corrected the problem for a customer.
Unfortunately, it still kept crashing on average once every
day. Customer is experimenting with a "guess" package with the
above patch, and it is already more than 2 days without a crash.
So, it should have had some side effect.
Optionally, the code could be reviewed to check when the stkref
field is increased/decreased and catch a wrap around before it
happens.
Comment 3Vincent Mihalkovič
2022-03-01 15:39:53 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (ksh bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2022:5938
Copy&paste of the requested patch: """ diff -up ksh-20120801/src/lib/libast/misc/stk.c.orig ksh-20120801/src/lib/libast/misc/stk.c --- ksh-20120801/src/lib/libast/misc/stk.c.orig 2022-01-31 16:06:11.923069379 -0300 +++ ksh-20120801/src/lib/libast/misc/stk.c 2022-01-31 16:06:54.896802455 -0300 @@ -76,7 +76,7 @@ struct frame struct stk { _stk_overflow_ stkoverflow; /* called when malloc fails */ - short stkref; /* reference count; */ + int stkref; /* reference count; */ short stkflags; /* stack attributes */ char *stkbase; /* beginning of current stack frame */ char *stkend; /* end of current stack frame */ """ In bz#2007364 we had ksh patched to use the stack robustness patch. It "almost" corrected the problem for a customer. Unfortunately, it still kept crashing on average once every day. Customer is experimenting with a "guess" package with the above patch, and it is already more than 2 days without a crash. So, it should have had some side effect. Optionally, the code could be reviewed to check when the stkref field is increased/decreased and catch a wrap around before it happens.