[Buildroot] [PATCH 1/1] package/libselinux: fix build with musl 1.2.2

[Yann E. MORIN <yann.morin.1998@free.fr>]

Fabrice, All,

On 2021-02-19 20:30 +0100, Fabrice Fontaine spake thusly:
> Fixes:
>  - http://autobuild.buildroot.org/results/34b010e76d65cf1d79ef53207cbc00a86674e17a
> 
> Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>

Applied to master, thanks.

Regards,
Yann E. MORIN.

> ---
>  ...d-to-something-which-never-conflicts.patch | 71 +++++++++++++++++++
>  1 file changed, 71 insertions(+)
>  create mode 100644 package/libselinux/0003-libselinux-rename-gettid-to-something-which-never-conflicts.patch
> 
> diff --git a/package/libselinux/0003-libselinux-rename-gettid-to-something-which-never-conflicts.patch b/package/libselinux/0003-libselinux-rename-gettid-to-something-which-never-conflicts.patch
> new file mode 100644
> index 0000000000..2a23e98f9b
> --- /dev/null
> +++ b/package/libselinux/0003-libselinux-rename-gettid-to-something-which-never-conflicts.patch
> @@ -0,0 +1,71 @@
> +From 398d2ceef92cb1baac18e6b34a1a8e1bf41296cd Mon Sep 17 00:00:00 2001
> +From: Nicolas Iooss <nicolas.iooss@m4x.org>
> +Date: Tue, 16 Feb 2021 22:13:28 +0100
> +Subject: [PATCH] libselinux: rename gettid() to something which never
> + conflicts with the libc
> +
> +Musl recently added a wrapper for gettid() syscall. There is no way to
> +detect this new version in a reliable way, so rename our gettid()
> +wrapper to a non-conflicting name.
> +
> +Introduce a new function which, when using a libc known to provide a
> +wrapper for gettid(), calls it, and which, otherwise, performs the
> +syscall directly.
> +
> +Anyway this function is only used on systems where /proc/thread-self
> +does not exist, which are therefore running Linux<3.17.
> +
> +Fixes: https://github.com/SELinuxProject/selinux/issues/282
> +Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
> +Acked-by: Petr Lautrbach <plautrba@redhat.com>
> +[Retrieved from:
> +https://github.com/SELinuxProject/selinux/commit/398d2ceef92cb1baac18e6b34a1a8e1bf41296cd]
> +Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
> +---
> + src/procattr.c | 18 ++++++++++--------
> + 1 file changed, 10 insertions(+), 8 deletions(-)
> +
> +diff --git a/src/procattr.c b/src/procattr.c
> +index 1aa67ac53..840570525 100644
> +--- a/src/procattr.c
> ++++ b/src/procattr.c
> +@@ -25,21 +25,23 @@ static __thread char destructor_initialized;
> + /* Bionic and glibc >= 2.30 declare gettid() system call wrapper in unistd.h and
> +  * has a definition for it */
> + #ifdef __BIONIC__
> +-  #define OVERRIDE_GETTID 0
> ++  #define HAVE_GETTID 1
> + #elif !defined(__GLIBC_PREREQ)
> +-  #define OVERRIDE_GETTID 1
> ++  #define HAVE_GETTID 0
> + #elif !__GLIBC_PREREQ(2,30)
> +-  #define OVERRIDE_GETTID 1
> ++  #define HAVE_GETTID 0
> + #else
> +-  #define OVERRIDE_GETTID 0
> ++  #define HAVE_GETTID 1
> + #endif
> + 
> +-#if OVERRIDE_GETTID
> +-static pid_t gettid(void)
> ++static pid_t selinux_gettid(void)
> + {
> ++#if HAVE_GETTID
> ++	return gettid();
> ++#else
> + 	return syscall(__NR_gettid);
> +-}
> + #endif
> ++}
> + 
> + static void procattr_thread_destructor(void __attribute__((unused)) *unused)
> + {
> +@@ -94,7 +96,7 @@ static int openattr(pid_t pid, const char *attr, int flags)
> + 		if (fd >= 0 || errno != ENOENT)
> + 			goto out;
> + 		free(path);
> +-		tid = gettid();
> ++		tid = selinux_gettid();
> + 		rc = asprintf(&path, "/proc/self/task/%d/attr/%s", tid, attr);
> + 	} else {
> + 		errno = EINVAL;
> -- 
> 2.30.0
> 
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