From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org, Ian Rogers <irogers@google.com>,
Francesco Nigro <fnigro@redhat.com>,
Carlos O'Donell <carlos@redhat.com>,
Siddhesh Poyarekar <siddhesh@gotplt.org>
Subject: [PATCH 2/5] support: Add support_set_vma_name
Date: Thu, 26 Oct 2023 14:11:41 -0300 [thread overview]
Message-ID: <20231026171144.2188549-3-adhemerval.zanella@linaro.org> (raw)
In-Reply-To: <20231026171144.2188549-1-adhemerval.zanella@linaro.org>
Check if kernel supports prctl (PR_SET_VMA, PR_SET_VMA_ANON_NAME, ...).
---
support/Makefile | 1 +
support/support.h | 4 +++
support/support_set_vma_name.c | 49 ++++++++++++++++++++++++++++++++++
3 files changed, 54 insertions(+)
create mode 100644 support/support_set_vma_name.c
diff --git a/support/Makefile b/support/Makefile
index 917a858bd1..54a8cc30ac 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -80,6 +80,7 @@ libsupport-routines = \
support_select_modifies_timeout \
support_select_normalizes_timeout \
support_set_small_thread_stack_size \
+ support_set_vma_name \
support_shared_allocate \
support_small_stack_thread_attribute \
support_socket_so_timestamp_time64 \
diff --git a/support/support.h b/support/support.h
index b7f76bf080..659ef25b06 100644
--- a/support/support.h
+++ b/support/support.h
@@ -235,6 +235,10 @@ void support_stack_free (struct support_stack *stack);
The returned value is the lowest file descriptor number. */
int support_open_dev_null_range (int num, int flags, mode_t mode);
+
+/* Check if kernel supports set VMA range name. */
+extern bool support_set_vma_name (void);
+
__END_DECLS
#endif /* SUPPORT_H */
diff --git a/support/support_set_vma_name.c b/support/support_set_vma_name.c
new file mode 100644
index 0000000000..41f5dea409
--- /dev/null
+++ b/support/support_set_vma_name.c
@@ -0,0 +1,49 @@
+/* Check if kernel supports set VMA range name.
+ Copyright (C) 2023 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <support/check.h>
+#include <support/support.h>
+#include <support/xunistd.h>
+#include <sys/mman.h>
+#ifdef __linux__
+# include <sys/prctl.h>
+#endif
+
+bool
+support_set_vma_name (void)
+{
+#ifdef __linux__
+ size_t size = sysconf (_SC_PAGESIZE);
+ if (size == -1)
+ FAIL_EXIT1 ("sysconf (_SC_PAGESIZE): %m\n");
+
+ void *vma = xmmap (0,
+ size,
+ PROT_NONE,
+ MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE,
+ -1);
+
+ int r = prctl (PR_SET_VMA, PR_SET_VMA_ANON_NAME, vma, size, "vmaname");
+
+ xmunmap (vma, size);
+
+ return r == 0;
+#else
+ return false;
+#endif
+}
--
2.34.1
next prev parent reply other threads:[~2023-10-26 17:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-26 17:11 [PATCH 0/5] Add a tunable to decorate anonymous memory maps Adhemerval Zanella
2023-10-26 17:11 ` [PATCH 1/5] linux: Add __set_vma_name Adhemerval Zanella
2023-10-26 17:11 ` Adhemerval Zanella [this message]
2023-10-26 17:11 ` [PATCH 3/5] nptl: Decorate thread stack on pthread_create Adhemerval Zanella
2023-10-26 17:11 ` [PATCH 4/5] malloc: Decorate malloc maps Adhemerval Zanella
2023-10-26 17:11 ` [PATCH 5/5] elf: Add glibc.mem.decorate_maps tunable Adhemerval Zanella
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