musl: patch CVE-2025-26519

Details: https://nvd.nist.gov/vuln/detail/CVE-2025-26519

Pick the patches that are attached to the musl advisory:
https://www.openwall.com/lists/musl/2025/02/13/1

(From OE-Core rev: e1c1b4b5100e08b63a2e6e5ff608f79e7b202649)

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

3 files changed, 80 insertions, 1 deletions

diff --git a/meta/recipes-core/musl/musl/CVE-2025-26519-1.patch b/meta/recipes-core/musl/musl/CVE-2025-26519-1.patch
new file mode 100644
index 0000000000..a9ea3b4149
--- /dev/null
+++ b/meta/recipes-core/musl/musl/CVE-2025-26519-1.patch
@@ -0,0 +1,39 @@
+From 345d2a053c32f3443dbfdd313f49346ce30b92f8 Mon Sep 17 00:00:00 2001
+From: Rich Felker <dalias@aerifal.cx>
+Date: Wed, 19 Nov 2025 13:23:38 +0100
+Subject: [PATCH] iconv: fix erroneous input validation in EUC-KR decoder
+
+as a result of incorrect bounds checking on the lead byte being
+decoded, certain invalid inputs which should produce an encoding
+error, such as "\xc8\x41", instead produced out-of-bounds loads from
+the ksc table.
+
+in a worst case, the loaded value may not be a valid unicode scalar
+value, in which case, if the output encoding was UTF-8, wctomb would
+return (size_t)-1, causing an overflow in the output pointer and
+remaining buffer size which could clobber memory outside of the output
+buffer.
+
+bug report was submitted in private by Nick Wellnhofer on account of
+potential security implications.
+
+CVE: CVE-2025-26519
+Upstream-Status: Backport [https://git.musl-libc.org/cgit/musl/commit/?id=e5adcd97b5196e29991b524237381a0202a60659]
+Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
+---
+ src/locale/iconv.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/locale/iconv.c b/src/locale/iconv.c
+index 3047c27b..1fb66bc8 100644
+--- a/src/locale/iconv.c
++++ b/src/locale/iconv.c
+@@ -495,7 +495,7 @@ size_t iconv(iconv_t cd, char **restrict in, size_t *restrict inb, char **restri
+                        if (c >= 93 || d >= 94) {
+                                c += (0xa1-0x81);
+                                d += 0xa1;
+-                               if (c >= 93 || c>=0xc6-0x81 && d>0x52)
++                               if (c > 0xc6-0x81 || c==0xc6-0x81 && d>0x52)
+                                        goto ilseq;
+                                if (d-'A'<26) d = d-'A';
+                                else if (d-'a'<26) d = d-'a'+26;
diff --git a/meta/recipes-core/musl/musl/CVE-2025-26519-2.patch b/meta/recipes-core/musl/musl/CVE-2025-26519-2.patch
new file mode 100644
index 0000000000..82a09af535
--- /dev/null
+++ b/meta/recipes-core/musl/musl/CVE-2025-26519-2.patch
@@ -0,0 +1,38 @@
+From b81230050f6c3348038fe470d260028824b9a9e5 Mon Sep 17 00:00:00 2001
+From: Rich Felker <dalias@aerifal.cx>
+Date: Wed, 19 Nov 2025 13:27:15 +0100
+Subject: [PATCH] iconv: harden UTF-8 output code path against input decoder
+ bugs
+
+the UTF-8 output code was written assuming an invariant that iconv's
+decoders only emit valid Unicode Scalar Values which wctomb can encode
+successfully, thereby always returning a value between 1 and 4.
+
+if this invariant is not satisfied, wctomb returns (size_t)-1, and the
+subsequent adjustments to the output buffer pointer and remaining
+output byte count overflow, moving the output position backwards,
+potentially past the beginning of the buffer, without storing any
+bytes.
+
+CVE: CVE-2025-26519
+Upstream-Status: Backport [https://git.musl-libc.org/cgit/musl/commit/?id=c47ad25ea3b484e10326f933e927c0bc8cded3da]
+Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
+---
+ src/locale/iconv.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/locale/iconv.c b/src/locale/iconv.c
+index 1fb66bc8..fb1d3217 100644
+--- a/src/locale/iconv.c
++++ b/src/locale/iconv.c
+@@ -538,6 +538,10 @@ size_t iconv(iconv_t cd, char **restrict in, size_t *restrict inb, char **restri
+                                if (*outb < k) goto toobig;
+                                memcpy(*out, tmp, k);
+                        } else k = wctomb_utf8(*out, c);
++                       /* This failure condition should be unreachable, but
++                        * is included to prevent decoder bugs from translating
++                        * into advancement outside the output buffer range. */
++                       if (k>4) goto ilseq;
+                        *out += k;
+                        *outb -= k;
+                        break;
diff --git a/meta/recipes-core/musl/musl_git.bb b/meta/recipes-core/musl/musl_git.bb
index 4b85401360..f24da3b2cb 100644
--- a/meta/recipes-core/musl/musl_git.bb
+++ b/meta/recipes-core/musl/musl_git.bb
@@ -15,7 +15,9 @@ PV = "${BASEVER}+git${SRCPV}"
 SRC_URI = "git://git.musl-libc.org/musl;branch=master \
            file://0001-Make-dynamic-linker-a-relative-symlink-to-libc.patch \
            file://0002-ldso-Use-syslibdir-and-libdir-as-default-pathes-to-l.patch \
-          "
+           file://CVE-2025-26519-1.patch \
+           file://CVE-2025-26519-2.patch \
+           "
 
 S = "${WORKDIR}/git"