From ead7cdcd98fbcd531bcbfeace4773f63cf4f9342 Mon Sep 17 00:00:00 2001
From: fossdd <fossdd@pwned.life>
Date: Tue, 29 Jul 2025 12:01:58 +0200
Subject: [PATCH] community/linux-tools: patch gcc15

---
 community/linux-tools/APKBUILD    |  2 ++
 community/linux-tools/gcc15.patch | 59 +++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 community/linux-tools/gcc15.patch

diff --git a/community/linux-tools/APKBUILD b/community/linux-tools/APKBUILD
index ba00416e69f..2d4d978dbd4 100644
--- a/community/linux-tools/APKBUILD
+++ b/community/linux-tools/APKBUILD
@@ -72,6 +72,7 @@ source="https://kernel.org/pub/linux/kernel/v6.x/linux-$_kernver.tar.xz
 	cpupower.confd
 	usbip.initd
 	usbip.confd
+	gcc15.patch
 	"
 # append patch for non .0
 case $pkgver in
@@ -293,4 +294,5 @@ ea04b71c828df423e55ce22058015fe3cf13f58a1adbddefa61a8df26b343d22596d16737c592ead
 63cd12a4d8782198c71662e9205e346e064b65bae5e3e175b5bc43bdf7ec6ddf675b60349750afe3c37c8a925f9ae9a93530671821342581bd282a69e0773b8c  cpupower.confd
 fcbd64d844c9bc187d08cef5995e91a46c0df78deb24e96ac9210c0e2c730eca0301970d9b8ffbf003df274682d05072431a26b59d8c491f396618268a12ec92  usbip.initd
 eb8de617e27c4d5fdfee9c442e8f74b0afb4d0fe7b59eca3a19629eb70fea7e09b3c125bc968aa8810d845ce661c829bd0f3fdb2288664f2cccf423bc0ae6ae8  usbip.confd
+26c3f5fcf48cae17a618443df323e51553044286dc9365382c7bd3d2c9a3094930823e155017fbc838f8571449b543596b3febe943118068cfa1b4ee12721698  gcc15.patch
 "
diff --git a/community/linux-tools/gcc15.patch b/community/linux-tools/gcc15.patch
new file mode 100644
index 00000000000..17686b82d32
--- /dev/null
+++ b/community/linux-tools/gcc15.patch
@@ -0,0 +1,59 @@
+From 00f61be94dfdc94e2cb60e0620af9c529531680d Mon Sep 17 00:00:00 2001
+From: Achill Gilgenast <fossdd@pwned.life>
+Date: Sat, 26 Jul 2025 20:27:24 +0200
+Subject: [PATCH] FROMLIST: libbpf: avoid possible use of uninitialized mod_len
+
+If not fn_name, mod_len does never get initialized which fails now with
+gcc15 on Alpine Linux edge:
+
+	libbpf.c: In function 'find_kernel_btf_id.constprop':
+	libbpf.c:10100:33: error: 'mod_len' may be used uninitialized [-Werror=maybe-uninitialized]
+	10100 |                 if (mod_name && strncmp(mod->name, mod_name, mod_len) != 0)
+	      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+	libbpf.c:10070:21: note: 'mod_len' was declared here
+	10070 |         int ret, i, mod_len;
+	      |                     ^~~~~~~
+
+Link: https://lore.kernel.org/lkml/20250729094611.2065713-1-fossdd@pwned.life/
+Fixes: 8f8a024272f3 ("libbpf: support "module: Function" syntax for tracing programs")
+Signed-off-by: Achill Gilgenast <fossdd@pwned.life>
+---
+ tools/lib/bpf/libbpf.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
+index c8e29c52d28c..cdef24c31d11 100644
+--- a/tools/lib/bpf/libbpf.c
++++ b/tools/lib/bpf/libbpf.c
+@@ -10057,27 +10057,27 @@ static int libbpf_find_prog_btf_id(const char *name, __u32 attach_prog_fd, int t
+ 	btf__free(btf);
+ 	if (err <= 0) {
+ 		pr_warn("%s is not found in prog's BTF\n", name);
+ 		goto out;
+ 	}
+ out:
+ 	return err;
+ }
+ 
+ static int find_kernel_btf_id(struct bpf_object *obj, const char *attach_name,
+ 			      enum bpf_attach_type attach_type,
+ 			      int *btf_obj_fd, int *btf_type_id)
+ {
+-	int ret, i, mod_len;
++	int ret, i, mod_len = 0;
+ 	const char *fn_name, *mod_name = NULL;
+ 
+ 	fn_name = strchr(attach_name, ':');
+ 	if (fn_name) {
+ 		mod_name = attach_name;
+ 		mod_len = fn_name - mod_name;
+ 		fn_name++;
+ 	}
+ 
+ 	if (!mod_name || strncmp(mod_name, "vmlinux", mod_len) == 0) {
+ 		ret = find_attach_btf_id(obj->btf_vmlinux,
+ 					 mod_name ? fn_name : attach_name,
+ 					 attach_type);
+-- 
+2.50.1
+