Merge tag 'mm-nonmm-stable-2022-05-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull misc updates from Andrew Morton:
 "The non-MM patch queue for this merge window.

  Not a lot of material this cycle. Many singleton patches against
  various subsystems. Most notably some maintenance work in ocfs2
  and initramfs"

* tag 'mm-nonmm-stable-2022-05-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (65 commits)
  kcov: update pos before writing pc in trace function
  ocfs2: dlmfs: fix error handling of user_dlm_destroy_lock
  ocfs2: dlmfs: don't clear USER_LOCK_ATTACHED when destroying lock
  fs/ntfs: remove redundant variable idx
  fat: remove time truncations in vfat_create/vfat_mkdir
  fat: report creation time in statx
  fat: ignore ctime updates, and keep ctime identical to mtime in memory
  fat: split fat_truncate_time() into separate functions
  MAINTAINERS: add Muchun as a memcg reviewer
  proc/sysctl: make protected_* world readable
  ia64: mca: drop redundant spinlock initialization
  tty: fix deadlock caused by calling printk() under tty_port->lock
  relay: remove redundant assignment to pointer buf
  fs/ntfs3: validate BOOT sectors_per_clusters
  lib/string_helpers: fix not adding strarray to device's resource list
  kernel/crash_core.c: remove redundant check of ck_cmdline
  ELF, uapi: fixup ELF_ST_TYPE definition
  ipc/mqueue: use get_tree_nodev() in mqueue_get_tree()
  ipc: update semtimedop() to use hrtimer
  ipc/sem: remove redundant assignments
  ...

usr/gen_init_cpio.c

@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <string.h>
@@ -20,10 +22,12 @@
 
 #define xstr(s) #s
 #define str(s) xstr(s)
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
 
 static unsigned int offset;
 static unsigned int ino = 721;
 static time_t default_mtime;
+static bool do_csum = false;
 
 struct file_handler {
 	const char *type;
@@ -77,7 +81,7 @@ static void cpio_trailer(void)
 
 	sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX"
 	       "%08X%08X%08X%08X%08X%08X%08X",
-		"070701",		/* magic */
+		do_csum ? "070702" : "070701", /* magic */
 		0,			/* ino */
 		0,			/* mode */
 		(long) 0,		/* uid */
@@ -109,7 +113,7 @@ static int cpio_mkslink(const char *name, const char *target,
 		name++;
 	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
 	       "%08X%08X%08X%08X%08X%08X%08X",
-		"070701",		/* magic */
+		do_csum ? "070702" : "070701", /* magic */
 		ino++,			/* ino */
 		S_IFLNK | mode,		/* mode */
 		(long) uid,		/* uid */
@@ -158,7 +162,7 @@ static int cpio_mkgeneric(const char *name, unsigned int mode,
 		name++;
 	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
 	       "%08X%08X%08X%08X%08X%08X%08X",
-		"070701",		/* magic */
+		do_csum ? "070702" : "070701", /* magic */
 		ino++,			/* ino */
 		mode,			/* mode */
 		(long) uid,		/* uid */
@@ -252,7 +256,7 @@ static int cpio_mknod(const char *name, unsigned int mode,
 		name++;
 	sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
 	       "%08X%08X%08X%08X%08X%08X%08X",
-		"070701",		/* magic */
+		do_csum ? "070702" : "070701", /* magic */
 		ino++,			/* ino */
 		mode,			/* mode */
 		(long) uid,		/* uid */
@@ -292,19 +296,42 @@ static int cpio_mknod_line(const char *line)
 	return rc;
 }
 
+static int cpio_mkfile_csum(int fd, unsigned long size, uint32_t *csum)
+{
+	while (size) {
+		unsigned char filebuf[65536];
+		ssize_t this_read;
+		size_t i, this_size = MIN(size, sizeof(filebuf));
+
+		this_read = read(fd, filebuf, this_size);
+		if (this_read <= 0 || this_read > this_size)
+			return -1;
+
+		for (i = 0; i < this_read; i++)
+			*csum += filebuf[i];
+
+		size -= this_read;
+	}
+	/* seek back to the start for data segment I/O */
+	if (lseek(fd, 0, SEEK_SET) < 0)
+		return -1;
+
+	return 0;
+}
+
 static int cpio_mkfile(const char *name, const char *location,
 			unsigned int mode, uid_t uid, gid_t gid,
 			unsigned int nlinks)
 {
 	char s[256];
-	char *filebuf = NULL;
 	struct stat buf;
-	long size;
+	unsigned long size;
 	int file = -1;
 	int retval;
 	int rc = -1;
 	int namesize;
 	unsigned int i;
+	uint32_t csum = 0;
 
 	mode |= S_IFREG;
 
@@ -326,29 +353,29 @@ static int cpio_mkfile(const char *name, const char *location,
 		buf.st_mtime = 0xffffffff;
 	}
 
-	filebuf = malloc(buf.st_size);
-	if (!filebuf) {
-		fprintf (stderr, "out of memory\n");
+	if (buf.st_size > 0xffffffff) {
+		fprintf(stderr, "%s: Size exceeds maximum cpio file size\n",
+			location);
 		goto error;
 	}
 
-	retval = read (file, filebuf, buf.st_size);
-	if (retval < 0) {
-		fprintf (stderr, "Can not read %s file\n", location);
+	if (do_csum && cpio_mkfile_csum(file, buf.st_size, &csum) < 0) {
+		fprintf(stderr, "Failed to checksum file %s\n", location);
 		goto error;
 	}
 
 	size = 0;
 	for (i = 1; i <= nlinks; i++) {
 		/* data goes on last link */
-		if (i == nlinks) size = buf.st_size;
+		if (i == nlinks)
+			size = buf.st_size;
 
 		if (name[0] == '/')
 			name++;
 		namesize = strlen(name) + 1;
 		sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
 		       "%08lX%08X%08X%08X%08X%08X%08X",
-			"070701",		/* magic */
+			do_csum ? "070702" : "070701", /* magic */
 			ino,			/* ino */
 			mode,			/* mode */
 			(long) uid,		/* uid */
@@ -361,28 +388,39 @@ static int cpio_mkfile(const char *name, const char *location,
 			0,			/* rmajor */
 			0,			/* rminor */
 			namesize,		/* namesize */
-			0);			/* chksum */
+			size ? csum : 0);	/* chksum */
 		push_hdr(s);
 		push_string(name);
 		push_pad();
 
-		if (size) {
-			if (fwrite(filebuf, size, 1, stdout) != 1) {
+		while (size) {
+			unsigned char filebuf[65536];
+			ssize_t this_read;
+			size_t this_size = MIN(size, sizeof(filebuf));
+
+			this_read = read(file, filebuf, this_size);
+			if (this_read <= 0 || this_read > this_size) {
+				fprintf(stderr, "Can not read %s file\n", location);
+				goto error;
+			}
+
+			if (fwrite(filebuf, this_read, 1, stdout) != 1) {
 				fprintf(stderr, "writing filebuf failed\n");
 				goto error;
 			}
-			offset += size;
-			push_pad();
+			offset += this_read;
+			size -= this_read;
 		}
+		push_pad();
 
 		name += namesize;
 	}
 	ino++;
 	rc = 0;
-	
+
 error:
-	if (filebuf) free(filebuf);
-	if (file >= 0) close(file);
+	if (file >= 0)
+		close(file);
 	return rc;
 }
 
@@ -458,7 +496,7 @@ static int cpio_mkfile_line(const char *line)
 static void usage(const char *prog)
 {
 	fprintf(stderr, "Usage:\n"
-		"\t%s [-t <timestamp>] <cpio_list>\n"
+		"\t%s [-t <timestamp>] [-c] <cpio_list>\n"
 		"\n"
 		"<cpio_list> is a file containing newline separated entries that\n"
 		"describe the files to be included in the initramfs archive:\n"
@@ -493,7 +531,8 @@ static void usage(const char *prog)
 		"\n"
 		"<timestamp> is time in seconds since Epoch that will be used\n"
 		"as mtime for symlinks, special files and directories. The default\n"
-		"is to use the current time for these entries.\n",
+		"is to use the current time for these entries.\n"
+		"-c: calculate and store 32-bit checksums for file data.\n",
 		prog);
 }
 
@@ -535,7 +574,7 @@ int main (int argc, char *argv[])
 
 	default_mtime = time(NULL);
 	while (1) {
-		int opt = getopt(argc, argv, "t:h");
+		int opt = getopt(argc, argv, "t:ch");
 		char *invalid;
 
 		if (opt == -1)
@@ -550,6 +589,9 @@ int main (int argc, char *argv[])
 				exit(1);
 			}
 			break;
+		case 'c':
+			do_csum = true;
+			break;
 		case 'h':
 		case '?':
 			usage(argv[0]);