TicketNo:DTS2020080802733

Description:add a private flag to mark an elf file, and remove obsolete cached pages before writing on a elf file

Team:OTHERS
Feature or Bugfix:Bugfix
Binary Source:NA
PrivateCode(Yes/No):No

Change-Id: If3a17ac05c5035045704a0b66307165ab0076c34
Reviewed-on: http://mgit-tm.rnd.huawei.com/10334851Reviewed-by: Ncaoruihong 00546070 <crh.cao@huawei.com>
Reviewed-by: Nshenwei 00579521 <denny.shenwei@huawei.com>
Tested-by: Npublic jenkins <public_jenkins@notesmail.huawei.com>

arch/arm/bits/fcntl.h

@@ -19,6 +19,8 @@
 #define O_TMPFILE 020040000
 #define O_NDELAY O_NONBLOCK
 
+#define O_ELFFILE 040
+
 #define F_DUPFD  0
 #define F_GETFD  1
 #define F_SETFD  2

kernel/arch/arm/bits/fcntl.h

@@ -24,6 +24,8 @@
 
 #define O_EXECVE 040000000
 
+#define O_ELFFILE 040
+
 #define F_DUPFD  0
 #define F_GETFD  1
 #define F_SETFD  2

ldso/dynlink.c

@@ -812,7 +812,7 @@ static int path_open(const char *name, const char *s, char *buf, size_t buf_size
 		l = strcspn(s, ":\n");
 		if (l-1 >= INT_MAX) return -1;
 		if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) < buf_size) {
-			if ((fd = open(buf, O_RDONLY))>=0) return fd; // open(buf, O_RDONLY|O_CLOEXEC)
+			if ((fd = open(buf, O_RDONLY | O_ELFFILE))>=0) return fd; // open(buf, O_RDONLY|O_CLOEXEC)
 			switch (errno) {
 			case ENOENT:
 			case ENOTDIR:
@@ -1040,7 +1040,7 @@ static struct dso *load_library(const char *name, struct dso *needed_by)
 	}
 	if (strchr(name, '/')) {
 		pathname = name;
-		fd = open(name, O_RDONLY); // open(name, O_RDONLY|O_CLOEXEC);
+		fd = open(name, O_RDONLY | O_ELFFILE); // open(name, O_RDONLY|O_CLOEXEC);
 	} else {
 		/* Search for the name to see if it's already loaded */
 		for (p=head->next; p; p=p->next) {