libc: fix post-2100 infinite-loop on 32-bit

The call of `mktime`/`timegm` with a broken down time after year 2100 led to an infinite-loop on 32bit. genodelabs/genode#3707
2024-12-18 21:27:56 +00:00 · 2023-12-07 15:00:47 +01:00 · 2023-12-07 15:00:47 +01:00 · 63dd5efa72
commit 63dd5efa72
parent 74abf8132e
2 changed files with 20 additions and 1 deletions
--- a/repos/libports/ports/libc.hash
+++ b/repos/libports/ports/libc.hash
@ -1 +1 @@
-dfcf0321f6f20fb8051954bc3fb4e661467a3434
+b36b17e21acc3a6b70bc550e19d08abbb15db71a
--- a/repos/libports/src/lib/libc/patches/mktime.patch
+++ b/repos/libports/src/lib/libc/patches/mktime.patch
@ -13,6 +13,25 @@ index 3c66924..05c01ae 100644
 	for ( ; ; ) {
 		t = lo / 2 + hi / 2;
 		if (t < lo)
+@@ -1955,14 +2251,14 @@ time2sub(struct tm *const tmp,
+ 		} else	dir = tmcomp(&mytm, &yourtm);
+ 		if (dir != 0) {
+ 			if (t == lo) {
+-				++t;
+-				if (t <= lo)
+				if (t == TIME_T_MAX)
+ 					return WRONG;
+				++t;
+ 				++lo;
+ 			} else if (t == hi) {
+-				--t;
+-				if (t >= hi)
+				if (t == TIME_T_MIN)
+ 					return WRONG;
+				--t;
+ 				--hi;
+ 			}
+ 			if (lo > hi)
 diff --git a/src/lib/libc/contrib/tzcode/stdtime/private.h b/src/lib/libc/contrib/tzcode/stdtime/private.h
 index 354a78b..8300ba0 100644
 --- src/lib/libc/contrib/tzcode/stdtime/private.h