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@ -1,66 +0,0 @@ |
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From 398d2ceef92cb1baac18e6b34a1a8e1bf41296cd Mon Sep 17 00:00:00 2001 |
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From: Nicolas Iooss <nicolas.iooss@m4x.org> |
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Date: Tue, 16 Feb 2021 22:13:28 +0100 |
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Subject: [PATCH] libselinux: rename gettid() to something which never |
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conflicts with the libc |
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Musl recently added a wrapper for gettid() syscall. There is no way to |
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detect this new version in a reliable way, so rename our gettid() |
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wrapper to a non-conflicting name. |
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Introduce a new function which, when using a libc known to provide a |
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wrapper for gettid(), calls it, and which, otherwise, performs the |
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syscall directly. |
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Anyway this function is only used on systems where /proc/thread-self |
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does not exist, which are therefore running Linux<3.17. |
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Fixes: https://github.com/SELinuxProject/selinux/issues/282 |
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Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org> |
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Acked-by: Petr Lautrbach <plautrba@redhat.com> |
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---
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src/procattr.c | 18 ++++++++++-------- |
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1 file changed, 10 insertions(+), 8 deletions(-) |
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--- a/src/procattr.c
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+++ b/src/procattr.c
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@@ -25,21 +25,23 @@ static __thread char destructor_initiali
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/* Bionic and glibc >= 2.30 declare gettid() system call wrapper in unistd.h and |
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* has a definition for it */ |
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#ifdef __BIONIC__ |
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- #define OVERRIDE_GETTID 0
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+ #define HAVE_GETTID 1
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#elif !defined(__GLIBC_PREREQ) |
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- #define OVERRIDE_GETTID 1
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+ #define HAVE_GETTID 0
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#elif !__GLIBC_PREREQ(2,30) |
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- #define OVERRIDE_GETTID 1
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+ #define HAVE_GETTID 0
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#else |
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- #define OVERRIDE_GETTID 0
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+ #define HAVE_GETTID 1
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#endif |
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-#if OVERRIDE_GETTID
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-static pid_t gettid(void)
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+static pid_t selinux_gettid(void)
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{ |
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+#if HAVE_GETTID
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+ return gettid();
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+#else
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return syscall(__NR_gettid); |
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-}
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#endif |
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+}
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static void procattr_thread_destructor(void __attribute__((unused)) *unused) |
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{ |
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@@ -94,7 +96,7 @@ static int openattr(pid_t pid, const cha
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if (fd >= 0 || errno != ENOENT) |
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goto out; |
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free(path); |
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- tid = gettid();
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+ tid = selinux_gettid();
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rc = asprintf(&path, "/proc/self/task/%d/attr/%s", tid, attr); |
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} else { |
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errno = EINVAL; |