[PATCH v2] eal/linux: improve ASLR check

[Yang Ming]

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 at dpdk.org

Signed-off-by: Yang Ming <ming.1.yang at 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