buildroot/package/android-tools/0014-core-adbd-adb.c-open-code-capset.patch

From 850fd3f4a0384ebe492a466a9b1149060619aacb Mon Sep 17 00:00:00 2001
From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Date: Sun, 14 Jul 2024 12:57:22 +0200
Subject: [PATCH] core/adbd/adb.c: open code capset()

capset() is apparently implemented by C libraries (at least glibc and
musl), but not exposed through a header as an official public API.

In addition capset(2) says:

  Note: glibc provides no wrappers for these system calls,
  necessitating the use of syscall(2)

The lack of a header with a prototype for capset() was not causing any
problem so far, but GCC 14.x has become stricter on implicit
declarations, causing the build to fail with:

core/adbd/adb.c:1296:9: error: implicit declaration of function 'capset' [-Wimplicit-function-declaration]

So fix that by open-coding it using syscall() as suggested by the man
page.

Upstream: N/A, we're too far from upstream
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
 core/adbd/adb.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/core/adbd/adb.c b/core/adbd/adb.c
index 7fe6445..98b1de1 100644
--- a/core/adbd/adb.c
+++ b/core/adbd/adb.c
@@ -41,6 +41,7 @@
 #if !ADB_HOST
 #include "android_filesystem_config.h"
 #include <linux/capability.h>
+#include <sys/syscall.h>
 #include <linux/prctl.h>
 #include <sys/mount.h>
 #else
@@ -1293,7 +1294,7 @@ int adb_main(int is_daemon, int server_port)
         header.pid = 0;
         cap[CAP_TO_INDEX(CAP_SYS_BOOT)].effective |= CAP_TO_MASK(CAP_SYS_BOOT);
         cap[CAP_TO_INDEX(CAP_SYS_BOOT)].permitted |= CAP_TO_MASK(CAP_SYS_BOOT);
-        capset(&header, cap);
+        syscall(SYS_capset, &header, cap);
 
         D("Local port disabled\n");
     } else {
-- 
2.47.0