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From: Yang Ming <ming.1.yang@nokia-sbell.com>
To: dev@dpdk.org
Cc: Yang Ming <ming.1.yang@nokia-sbell.com>,
stable@dpdk.org
Subject: [PATCH v2] eal/linux: improve ASLR check
Date: Thu, 13 Mar 2025 14:19:03 +0800
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This change ensures that the current process is checked for
being run with 'setarch' before verifying the value of
'/proc/sys/kernel/randomize_va_space'. The '-R' or
'--addr-no-randomize' parameter of the 'setarch' command is used
to disable the randomization of the virtual address space.
Fixes: af75078fece3 ("first public release")
Cc: stable@dpdk.org
Signed-off-by: Yang Ming <ming.1.yang@nokia-sbell.com>
---
lib/eal/linux/eal_memory.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/lib/eal/linux/eal_memory.c b/lib/eal/linux/eal_memory.c
index 9dda60c0e1..5ef1575b66 100644
--- a/lib/eal/linux/eal_memory.c
+++ b/lib/eal/linux/eal_memory.c
@@ -15,6 +15,7 @@
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/resource.h>
+#include <sys/personality.h>
#include <unistd.h>
#include <limits.h>
#include <signal.h>
@@ -200,6 +201,17 @@ static int
aslr_enabled(void)
{
char c;
+
+ /*
+ * Check whether the current process is executed with the command line
+ * "setarch ... --addr-no-randomize ..." or "setarch ... -R ..."
+ * This complements the sysfs check to ensure comprehensive ASLR status detection.
+ * This check is necessary to support the functionality of the "setarch" command,
+ * which can disable ASLR by setting the ADDR_NO_RANDOMIZE personality flag.
+ */
+ if ((personality(0xffffffff) & ADDR_NO_RANDOMIZE) == ADDR_NO_RANDOMIZE)
+ return 0;
+
int retval, fd = open(RANDOMIZE_VA_SPACE_FILE, O_RDONLY);
if (fd < 0)
return -errno;
--
2.34.1