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package/libselinux: fix build with musl 1.2.2

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Fixes:
 - http://autobuild.buildroot.org/results/34b010e76d65cf1d79ef53207cbc00a86674e17a

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Fabrice Fontaine 2021-02-19 20:30:30 +01:00 committed by Yann E. MORIN
parent a6aeee74d3
commit 452f9ca82f
1 changed files with 71 additions and 0 deletions
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71
package/libselinux/0003-libselinux-rename-gettid-to-something-which-never-conflicts.patch Normal file
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@ -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;