// SPDX-License-Identifier: GPL-2.0#include <kunit/test.h>#include <linux/fcntl.h>#include <linux/file.h>#include <linux/fs.h>#include <linux/init_syscalls.h>#include <linux/stringify.h>#include <linux/timekeeping.h>#include "initramfs_internal.h" struct initramfs_test_cpio { char *magic; unsigned int ino; unsigned int mode; unsigned int uid; unsigned int gid; unsigned int nlink; unsigned int mtime; unsigned int filesize; unsigned int devmajor; unsigned int devminor; unsigned int rdevmajor; unsigned int rdevminor; unsigned int namesize; unsigned int csum; char *fname; char *data;}; static size_t fill_cpio(struct initramfs_test_cpio *cs, size_t csz, char *out){ int i; size_t off = 0; for (i = 0; i < csz; i++) { char *pos = &out[off]; struct initramfs_test_cpio *c = &cs[i]; size_t thislen; /* +1 to account for nulterm */ thislen = sprintf(pos, "%s" "%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x" "%s", c->magic, c->ino, c->mode, c->uid, c->gid, c->nlink, c->mtime, c->filesize, c->devmajor, c->devminor, c->rdevmajor, c->rdevminor, c->namesize, c->csum, c->fname) + 1; pr_debug("packing (%zu): %.*s\n", thislen, (int)thislen, pos); if (thislen != CPIO_HDRLEN + c->namesize) pr_debug("padded to: %u\n", CPIO_HDRLEN + c->namesize); off += CPIO_HDRLEN + c->namesize; while (off & 3) out[off++] = '\0'; memcpy(&out[off], c->data, c->filesize); off += c->filesize; while (off & 3) out[off++] = '\0'; } return off;} static void __init initramfs_test_extract(struct kunit *test){ char *err, *cpio_srcbuf; size_t len; struct timespec64 ts_before, ts_after; struct kstat st = {}; struct initramfs_test_cpio c[] = { { .magic = "070701", .ino = 1, .mode = S_IFREG | 0777, .uid = 12, .gid = 34, .nlink = 1, .mtime = 56, .filesize = 0, .devmajor = 0, .devminor = 1, .rdevmajor = 0, .rdevminor = 0, .namesize = sizeof("initramfs_test_extract"), .csum = 0, .fname = "initramfs_test_extract", }, { .magic = "070701", .ino = 2, .mode = S_IFDIR | 0777, .nlink = 1, .mtime = 57, .devminor = 1, .namesize = sizeof("initramfs_test_extract_dir"), .fname = "initramfs_test_extract_dir", }, { .magic = "070701", .namesize = sizeof("TRAILER!!!"), .fname = "TRAILER!!!", } }; /* +3 to cater for any 4-byte end-alignment */ cpio_srcbuf = kzalloc(ARRAY_SIZE(c) * (CPIO_HDRLEN + PATH_MAX + 3), GFP_KERNEL); len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf); ktime_get_real_ts64(&ts_before); err = unpack_to_rootfs(cpio_srcbuf, len); ktime_get_real_ts64(&ts_after); if (err) { KUNIT_FAIL(test, "unpack failed %s", err); goto out; } KUNIT_EXPECT_EQ(test, init_stat(c[0].fname, &st, 0), 0); KUNIT_EXPECT_TRUE(test, S_ISREG(st.mode)); KUNIT_EXPECT_TRUE(test, uid_eq(st.uid, KUIDT_INIT(c[0].uid))); KUNIT_EXPECT_TRUE(test, gid_eq(st.gid, KGIDT_INIT(c[0].gid))); KUNIT_EXPECT_EQ(test, st.nlink, 1); if (IS_ENABLED(CONFIG_INITRAMFS_PRESERVE_MTIME)) { KUNIT_EXPECT_EQ(test, st.mtime.tv_sec, c[0].mtime); } else { KUNIT_EXPECT_GE(test, st.mtime.tv_sec, ts_before.tv_sec); KUNIT_EXPECT_LE(test, st.mtime.tv_sec, ts_after.tv_sec); } KUNIT_EXPECT_EQ(test, st.blocks, c[0].filesize); KUNIT_EXPECT_EQ(test, init_stat(c[1].fname, &st, 0), 0); KUNIT_EXPECT_TRUE(test, S_ISDIR(st.mode)); if (IS_ENABLED(CONFIG_INITRAMFS_PRESERVE_MTIME)) { KUNIT_EXPECT_EQ(test, st.mtime.tv_sec, c[1].mtime); } else { KUNIT_EXPECT_GE(test, st.mtime.tv_sec, ts_before.tv_sec); KUNIT_EXPECT_LE(test, st.mtime.tv_sec, ts_after.tv_sec); } KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0); KUNIT_EXPECT_EQ(test, init_rmdir(c[1].fname), 0);out: kfree(cpio_srcbuf);} /* * Don't terminate filename. Previously, the cpio filename field was passed * directly to filp_open(collected, O_CREAT|..) without nulterm checks. See * https://lore.kernel.org/linux-fsdevel/20241030035509.20194-2-ddiss@suse.de */static void __init initramfs_test_fname_overrun(struct kunit *test){ char *err, *cpio_srcbuf; size_t len, suffix_off; struct initramfs_test_cpio c[] = { { .magic = "070701", .ino = 1, .mode = S_IFREG | 0777, .uid = 0, .gid = 0, .nlink = 1, .mtime = 1, .filesize = 0, .devmajor = 0, .devminor = 1, .rdevmajor = 0, .rdevminor = 0, .namesize = sizeof("initramfs_test_fname_overrun"), .csum = 0, .fname = "initramfs_test_fname_overrun", } }; /* * poison cpio source buffer, so we can detect overrun. source * buffer is used by read_into() when hdr or fname * are already available (e.g. no compression). */ cpio_srcbuf = kmalloc(CPIO_HDRLEN + PATH_MAX + 3, GFP_KERNEL); memset(cpio_srcbuf, 'B', CPIO_HDRLEN + PATH_MAX + 3); /* limit overrun to avoid crashes / filp_open() ENAMETOOLONG */ cpio_srcbuf[CPIO_HDRLEN + strlen(c[0].fname) + 20] = '\0'; len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf); /* overwrite trailing fname terminator and padding */ suffix_off = len - 1; while (cpio_srcbuf[suffix_off] == '\0') { cpio_srcbuf[suffix_off] = 'P'; suffix_off--; } err = unpack_to_rootfs(cpio_srcbuf, len); KUNIT_EXPECT_NOT_NULL(test, err); kfree(cpio_srcbuf);} static void __init initramfs_test_data(struct kunit *test){ char *err, *cpio_srcbuf; size_t len; struct file *file; struct initramfs_test_cpio c[] = { { .magic = "070701", .ino = 1, .mode = S_IFREG | 0777, .uid = 0, .gid = 0, .nlink = 1, .mtime = 1, .filesize = sizeof("ASDF") - 1, .devmajor = 0, .devminor = 1, .rdevmajor = 0, .rdevminor = 0, .namesize = sizeof("initramfs_test_data"), .csum = 0, .fname = "initramfs_test_data", .data = "ASDF", } }; /* +6 for max name and data 4-byte padding */ cpio_srcbuf = kmalloc(CPIO_HDRLEN + c[0].namesize + c[0].filesize + 6, GFP_KERNEL); len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf); err = unpack_to_rootfs(cpio_srcbuf, len); KUNIT_EXPECT_NULL(test, err); file = filp_open(c[0].fname, O_RDONLY, 0); if (IS_ERR(file)) { KUNIT_FAIL(test, "open failed"); goto out; } /* read back file contents into @cpio_srcbuf and confirm match */ len = kernel_read(file, cpio_srcbuf, c[0].filesize, NULL); KUNIT_EXPECT_EQ(test, len, c[0].filesize); KUNIT_EXPECT_MEMEQ(test, cpio_srcbuf, c[0].data, len); fput(file); KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0);out: kfree(cpio_srcbuf);} static void __init initramfs_test_csum(struct kunit *test){ char *err, *cpio_srcbuf; size_t len; struct initramfs_test_cpio c[] = { { /* 070702 magic indicates a valid csum is present */ .magic = "070702", .ino = 1, .mode = S_IFREG | 0777, .nlink = 1, .filesize = sizeof("ASDF") - 1, .devminor = 1, .namesize = sizeof("initramfs_test_csum"), .csum = 'A' + 'S' + 'D' + 'F', .fname = "initramfs_test_csum", .data = "ASDF", }, { /* mix csum entry above with no-csum entry below */ .magic = "070701", .ino = 2, .mode = S_IFREG | 0777, .nlink = 1, .filesize = sizeof("ASDF") - 1, .devminor = 1, .namesize = sizeof("initramfs_test_csum_not_here"), /* csum ignored */ .csum = 5555, .fname = "initramfs_test_csum_not_here", .data = "ASDF", } }; cpio_srcbuf = kmalloc(8192, GFP_KERNEL); len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf); err = unpack_to_rootfs(cpio_srcbuf, len); KUNIT_EXPECT_NULL(test, err); KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0); KUNIT_EXPECT_EQ(test, init_unlink(c[1].fname), 0); /* mess up the csum and confirm that unpack fails */ c[0].csum--; len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf); err = unpack_to_rootfs(cpio_srcbuf, len); KUNIT_EXPECT_NOT_NULL(test, err); /* * file (with content) is still retained in case of bad-csum abort. * Perhaps we should change this. */ KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0); KUNIT_EXPECT_EQ(test, init_unlink(c[1].fname), -ENOENT); kfree(cpio_srcbuf);} /* * hardlink hashtable may leak when the archive omits a trailer: * https://lore.kernel.org/r/20241107002044.16477-10-ddiss@suse.de/ */static void __init initramfs_test_hardlink(struct kunit *test){ char *err, *cpio_srcbuf; size_t len; struct kstat st0, st1; struct initramfs_test_cpio c[] = { { .magic = "070701", .ino = 1, .mode = S_IFREG | 0777, .nlink = 2, .devminor = 1, .namesize = sizeof("initramfs_test_hardlink"), .fname = "initramfs_test_hardlink", }, { /* hardlink data is present in last archive entry */ .magic = "070701", .ino = 1, .mode = S_IFREG | 0777, .nlink = 2, .filesize = sizeof("ASDF") - 1, .devminor = 1, .namesize = sizeof("initramfs_test_hardlink_link"), .fname = "initramfs_test_hardlink_link", .data = "ASDF", } }; cpio_srcbuf = kmalloc(8192, GFP_KERNEL); len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf); err = unpack_to_rootfs(cpio_srcbuf, len); KUNIT_EXPECT_NULL(test, err); KUNIT_EXPECT_EQ(test, init_stat(c[0].fname, &st0, 0), 0); KUNIT_EXPECT_EQ(test, init_stat(c[1].fname, &st1, 0), 0); KUNIT_EXPECT_EQ(test, st0.ino, st1.ino); KUNIT_EXPECT_EQ(test, st0.nlink, 2); KUNIT_EXPECT_EQ(test, st1.nlink, 2); KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0); KUNIT_EXPECT_EQ(test, init_unlink(c[1].fname), 0); kfree(cpio_srcbuf);} #define INITRAMFS_TEST_MANY_LIMIT 1000#define INITRAMFS_TEST_MANY_PATH_MAX (sizeof("initramfs_test_many-") \ + sizeof(__stringify(INITRAMFS_TEST_MANY_LIMIT)))static void __init initramfs_test_many(struct kunit *test){ char *err, *cpio_srcbuf, *p; size_t len = INITRAMFS_TEST_MANY_LIMIT * (CPIO_HDRLEN + INITRAMFS_TEST_MANY_PATH_MAX + 3); char thispath[INITRAMFS_TEST_MANY_PATH_MAX]; int i; p = cpio_srcbuf = kmalloc(len, GFP_KERNEL); for (i = 0; i < INITRAMFS_TEST_MANY_LIMIT; i++) { struct initramfs_test_cpio c = { .magic = "070701", .ino = i, .mode = S_IFREG | 0777, .nlink = 1, .devminor = 1, .fname = thispath, }; c.namesize = 1 + sprintf(thispath, "initramfs_test_many-%d", i); p += fill_cpio(&c, 1, p); } len = p - cpio_srcbuf; err = unpack_to_rootfs(cpio_srcbuf, len); KUNIT_EXPECT_NULL(test, err); for (i = 0; i < INITRAMFS_TEST_MANY_LIMIT; i++) { sprintf(thispath, "initramfs_test_many-%d", i); KUNIT_EXPECT_EQ(test, init_unlink(thispath), 0); } kfree(cpio_srcbuf);} /* * An initramfs filename is namesize in length, including the zero-terminator. * A filename can be zero-terminated prior to namesize, with the remainder used * as padding. This can be useful for e.g. alignment of file data segments with * a 4KB filesystem block, allowing for extent sharing (reflinks) between cpio * source and destination. This hack works with both GNU cpio and initramfs, as * long as PATH_MAX isn't exceeded. */static void __init initramfs_test_fname_pad(struct kunit *test){ char *err; size_t len; struct file *file; char fdata[] = "this file data is aligned at 4K in the archive"; struct test_fname_pad { char padded_fname[4096 - CPIO_HDRLEN]; char cpio_srcbuf[CPIO_HDRLEN + PATH_MAX + 3 + sizeof(fdata)]; } *tbufs = kzalloc(sizeof(struct test_fname_pad), GFP_KERNEL); struct initramfs_test_cpio c[] = { { .magic = "070701", .ino = 1, .mode = S_IFREG | 0777, .uid = 0, .gid = 0, .nlink = 1, .mtime = 1, .filesize = sizeof(fdata), .devmajor = 0, .devminor = 1, .rdevmajor = 0, .rdevminor = 0, /* align file data at 4K archive offset via padded fname */ .namesize = 4096 - CPIO_HDRLEN, .csum = 0, .fname = tbufs->padded_fname, .data = fdata, } }; memcpy(tbufs->padded_fname, "padded_fname", sizeof("padded_fname")); len = fill_cpio(c, ARRAY_SIZE(c), tbufs->cpio_srcbuf); err = unpack_to_rootfs(tbufs->cpio_srcbuf, len); KUNIT_EXPECT_NULL(test, err); file = filp_open(c[0].fname, O_RDONLY, 0); if (IS_ERR(file)) { KUNIT_FAIL(test, "open failed"); goto out; } /* read back file contents into @cpio_srcbuf and confirm match */ len = kernel_read(file, tbufs->cpio_srcbuf, c[0].filesize, NULL); KUNIT_EXPECT_EQ(test, len, c[0].filesize); KUNIT_EXPECT_MEMEQ(test, tbufs->cpio_srcbuf, c[0].data, len); fput(file); KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0);out: kfree(tbufs);} /* * The kunit_case/_suite struct cannot be marked as __initdata as this will be * used in debugfs to retrieve results after test has run. */static struct kunit_case __refdata initramfs_test_cases[] = { KUNIT_CASE(initramfs_test_extract), KUNIT_CASE(initramfs_test_fname_overrun), KUNIT_CASE(initramfs_test_data), KUNIT_CASE(initramfs_test_csum), KUNIT_CASE(initramfs_test_hardlink), KUNIT_CASE(initramfs_test_many), KUNIT_CASE(initramfs_test_fname_pad), {},}; static struct kunit_suite initramfs_test_suite = { .name = "initramfs", .test_cases = initramfs_test_cases,};kunit_test_init_section_suites(&initramfs_test_suite); MODULE_DESCRIPTION("Initramfs KUnit test suite");MODULE_LICENSE("GPL v2");
// SPDX-License-Identifier: GPL-2.0
#include <kunit/test.h>
#include <linux/fcntl.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/init_syscalls.h>
#include <linux/stringify.h>
#include <linux/timekeeping.h>
#include "initramfs_internal.h"
struct initramfs_test_cpio {
char *magic;
unsigned int ino;
unsigned int mode;
unsigned int uid;
unsigned int gid;
unsigned int nlink;
unsigned int mtime;
unsigned int filesize;
unsigned int devmajor;
unsigned int devminor;
unsigned int rdevmajor;
unsigned int rdevminor;
unsigned int namesize;
unsigned int csum;
char *fname;
char *data;
};
static size_t fill_cpio(struct initramfs_test_cpio *cs, size_t csz, char *out)
{
int i;
size_t off = 0;
for (i = 0; i < csz; i++) {
char *pos = &out[off];
struct initramfs_test_cpio *c = &cs[i];
size_t thislen;
/* +1 to account for nulterm */
thislen = sprintf(pos, "%s"
"%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x"
"%s",
c->magic, c->ino, c->mode, c->uid, c->gid, c->nlink,
c->mtime, c->filesize, c->devmajor, c->devminor,
c->rdevmajor, c->rdevminor, c->namesize, c->csum,
c->fname) + 1;
pr_debug("packing (%zu): %.*s\n", thislen, (int)thislen, pos);
if (thislen != CPIO_HDRLEN + c->namesize)
pr_debug("padded to: %u\n", CPIO_HDRLEN + c->namesize);
off += CPIO_HDRLEN + c->namesize;
while (off & 3)
out[off++] = '\0';
memcpy(&out[off], c->data, c->filesize);
off += c->filesize;
while (off & 3)
out[off++] = '\0';
}
return off;
}
static void __init initramfs_test_extract(struct kunit *test)
{
char *err, *cpio_srcbuf;
size_t len;
struct timespec64 ts_before, ts_after;
struct kstat st = {};
struct initramfs_test_cpio c[] = { {
.magic = "070701",
.ino = 1,
.mode = S_IFREG | 0777,
.uid = 12,
.gid = 34,
.nlink = 1,
.mtime = 56,
.filesize = 0,
.devmajor = 0,
.devminor = 1,
.rdevmajor = 0,
.rdevminor = 0,
.namesize = sizeof("initramfs_test_extract"),
.csum = 0,
.fname = "initramfs_test_extract",
}, {
.magic = "070701",
.ino = 2,
.mode = S_IFDIR | 0777,
.nlink = 1,
.mtime = 57,
.devminor = 1,
.namesize = sizeof("initramfs_test_extract_dir"),
.fname = "initramfs_test_extract_dir",
}, {
.magic = "070701",
.namesize = sizeof("TRAILER!!!"),
.fname = "TRAILER!!!",
} };
/* +3 to cater for any 4-byte end-alignment */
cpio_srcbuf = kzalloc(ARRAY_SIZE(c) * (CPIO_HDRLEN + PATH_MAX + 3),
GFP_KERNEL);
len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf);
ktime_get_real_ts64(&ts_before);
err = unpack_to_rootfs(cpio_srcbuf, len);
ktime_get_real_ts64(&ts_after);
if (err) {
KUNIT_FAIL(test, "unpack failed %s", err);
goto out;
}
KUNIT_EXPECT_EQ(test, init_stat(c[0].fname, &st, 0), 0);
KUNIT_EXPECT_TRUE(test, S_ISREG(st.mode));
KUNIT_EXPECT_TRUE(test, uid_eq(st.uid, KUIDT_INIT(c[0].uid)));
KUNIT_EXPECT_TRUE(test, gid_eq(st.gid, KGIDT_INIT(c[0].gid)));
KUNIT_EXPECT_EQ(test, st.nlink, 1);
if (IS_ENABLED(CONFIG_INITRAMFS_PRESERVE_MTIME)) {
KUNIT_EXPECT_EQ(test, st.mtime.tv_sec, c[0].mtime);
} else {
KUNIT_EXPECT_GE(test, st.mtime.tv_sec, ts_before.tv_sec);
KUNIT_EXPECT_LE(test, st.mtime.tv_sec, ts_after.tv_sec);
}
KUNIT_EXPECT_EQ(test, st.blocks, c[0].filesize);
KUNIT_EXPECT_EQ(test, init_stat(c[1].fname, &st, 0), 0);
KUNIT_EXPECT_TRUE(test, S_ISDIR(st.mode));
if (IS_ENABLED(CONFIG_INITRAMFS_PRESERVE_MTIME)) {
KUNIT_EXPECT_EQ(test, st.mtime.tv_sec, c[1].mtime);
} else {
KUNIT_EXPECT_GE(test, st.mtime.tv_sec, ts_before.tv_sec);
KUNIT_EXPECT_LE(test, st.mtime.tv_sec, ts_after.tv_sec);
}
KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0);
KUNIT_EXPECT_EQ(test, init_rmdir(c[1].fname), 0);
out:
kfree(cpio_srcbuf);
}
/*
* Don't terminate filename. Previously, the cpio filename field was passed
* directly to filp_open(collected, O_CREAT|..) without nulterm checks. See
* https://lore.kernel.org/linux-fsdevel/20241030035509.20194-2-ddiss@suse.de
*/
static void __init initramfs_test_fname_overrun(struct kunit *test)
{
char *err, *cpio_srcbuf;
size_t len, suffix_off;
struct initramfs_test_cpio c[] = { {
.magic = "070701",
.ino = 1,
.mode = S_IFREG | 0777,
.uid = 0,
.gid = 0,
.nlink = 1,
.mtime = 1,
.filesize = 0,
.devmajor = 0,
.devminor = 1,
.rdevmajor = 0,
.rdevminor = 0,
.namesize = sizeof("initramfs_test_fname_overrun"),
.csum = 0,
.fname = "initramfs_test_fname_overrun",
} };
/*
* poison cpio source buffer, so we can detect overrun. source
* buffer is used by read_into() when hdr or fname
* are already available (e.g. no compression).
*/
cpio_srcbuf = kmalloc(CPIO_HDRLEN + PATH_MAX + 3, GFP_KERNEL);
memset(cpio_srcbuf, 'B', CPIO_HDRLEN + PATH_MAX + 3);
/* limit overrun to avoid crashes / filp_open() ENAMETOOLONG */
cpio_srcbuf[CPIO_HDRLEN + strlen(c[0].fname) + 20] = '\0';
len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf);
/* overwrite trailing fname terminator and padding */
suffix_off = len - 1;
while (cpio_srcbuf[suffix_off] == '\0') {
cpio_srcbuf[suffix_off] = 'P';
suffix_off--;
}
err = unpack_to_rootfs(cpio_srcbuf, len);
KUNIT_EXPECT_NOT_NULL(test, err);
kfree(cpio_srcbuf);
}
static void __init initramfs_test_data(struct kunit *test)
{
char *err, *cpio_srcbuf;
size_t len;
struct file *file;
struct initramfs_test_cpio c[] = { {
.magic = "070701",
.ino = 1,
.mode = S_IFREG | 0777,
.uid = 0,
.gid = 0,
.nlink = 1,
.mtime = 1,
.filesize = sizeof("ASDF") - 1,
.devmajor = 0,
.devminor = 1,
.rdevmajor = 0,
.rdevminor = 0,
.namesize = sizeof("initramfs_test_data"),
.csum = 0,
.fname = "initramfs_test_data",
.data = "ASDF",
} };
/* +6 for max name and data 4-byte padding */
cpio_srcbuf = kmalloc(CPIO_HDRLEN + c[0].namesize + c[0].filesize + 6,
GFP_KERNEL);
len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf);
err = unpack_to_rootfs(cpio_srcbuf, len);
KUNIT_EXPECT_NULL(test, err);
file = filp_open(c[0].fname, O_RDONLY, 0);
if (IS_ERR(file)) {
KUNIT_FAIL(test, "open failed");
goto out;
}
/* read back file contents into @cpio_srcbuf and confirm match */
len = kernel_read(file, cpio_srcbuf, c[0].filesize, NULL);
KUNIT_EXPECT_EQ(test, len, c[0].filesize);
KUNIT_EXPECT_MEMEQ(test, cpio_srcbuf, c[0].data, len);
fput(file);
KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0);
out:
kfree(cpio_srcbuf);
}
static void __init initramfs_test_csum(struct kunit *test)
{
char *err, *cpio_srcbuf;
size_t len;
struct initramfs_test_cpio c[] = { {
/* 070702 magic indicates a valid csum is present */
.magic = "070702",
.ino = 1,
.mode = S_IFREG | 0777,
.nlink = 1,
.filesize = sizeof("ASDF") - 1,
.devminor = 1,
.namesize = sizeof("initramfs_test_csum"),
.csum = 'A' + 'S' + 'D' + 'F',
.fname = "initramfs_test_csum",
.data = "ASDF",
}, {
/* mix csum entry above with no-csum entry below */
.magic = "070701",
.ino = 2,
.mode = S_IFREG | 0777,
.nlink = 1,
.filesize = sizeof("ASDF") - 1,
.devminor = 1,
.namesize = sizeof("initramfs_test_csum_not_here"),
/* csum ignored */
.csum = 5555,
.fname = "initramfs_test_csum_not_here",
.data = "ASDF",
} };
cpio_srcbuf = kmalloc(8192, GFP_KERNEL);
len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf);
err = unpack_to_rootfs(cpio_srcbuf, len);
KUNIT_EXPECT_NULL(test, err);
KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0);
KUNIT_EXPECT_EQ(test, init_unlink(c[1].fname), 0);
/* mess up the csum and confirm that unpack fails */
c[0].csum--;
len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf);
err = unpack_to_rootfs(cpio_srcbuf, len);
KUNIT_EXPECT_NOT_NULL(test, err);
/*
* file (with content) is still retained in case of bad-csum abort.
* Perhaps we should change this.
*/
KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0);
KUNIT_EXPECT_EQ(test, init_unlink(c[1].fname), -ENOENT);
kfree(cpio_srcbuf);
}
/*
* hardlink hashtable may leak when the archive omits a trailer:
* https://lore.kernel.org/r/20241107002044.16477-10-ddiss@suse.de/
*/
static void __init initramfs_test_hardlink(struct kunit *test)
{
char *err, *cpio_srcbuf;
size_t len;
struct kstat st0, st1;
struct initramfs_test_cpio c[] = { {
.magic = "070701",
.ino = 1,
.mode = S_IFREG | 0777,
.nlink = 2,
.devminor = 1,
.namesize = sizeof("initramfs_test_hardlink"),
.fname = "initramfs_test_hardlink",
}, {
/* hardlink data is present in last archive entry */
.magic = "070701",
.ino = 1,
.mode = S_IFREG | 0777,
.nlink = 2,
.filesize = sizeof("ASDF") - 1,
.devminor = 1,
.namesize = sizeof("initramfs_test_hardlink_link"),
.fname = "initramfs_test_hardlink_link",
.data = "ASDF",
} };
cpio_srcbuf = kmalloc(8192, GFP_KERNEL);
len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf);
err = unpack_to_rootfs(cpio_srcbuf, len);
KUNIT_EXPECT_NULL(test, err);
KUNIT_EXPECT_EQ(test, init_stat(c[0].fname, &st0, 0), 0);
KUNIT_EXPECT_EQ(test, init_stat(c[1].fname, &st1, 0), 0);
KUNIT_EXPECT_EQ(test, st0.ino, st1.ino);
KUNIT_EXPECT_EQ(test, st0.nlink, 2);
KUNIT_EXPECT_EQ(test, st1.nlink, 2);
KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0);
KUNIT_EXPECT_EQ(test, init_unlink(c[1].fname), 0);
kfree(cpio_srcbuf);
}
#define INITRAMFS_TEST_MANY_LIMIT 1000
#define INITRAMFS_TEST_MANY_PATH_MAX (sizeof("initramfs_test_many-") \
+ sizeof(__stringify(INITRAMFS_TEST_MANY_LIMIT)))
static void __init initramfs_test_many(struct kunit *test)
{
char *err, *cpio_srcbuf, *p;
size_t len = INITRAMFS_TEST_MANY_LIMIT *
(CPIO_HDRLEN + INITRAMFS_TEST_MANY_PATH_MAX + 3);
char thispath[INITRAMFS_TEST_MANY_PATH_MAX];
int i;
p = cpio_srcbuf = kmalloc(len, GFP_KERNEL);
for (i = 0; i < INITRAMFS_TEST_MANY_LIMIT; i++) {
struct initramfs_test_cpio c = {
.magic = "070701",
.ino = i,
.mode = S_IFREG | 0777,
.nlink = 1,
.devminor = 1,
.fname = thispath,
};
c.namesize = 1 + sprintf(thispath, "initramfs_test_many-%d", i);
p += fill_cpio(&c, 1, p);
}
len = p - cpio_srcbuf;
err = unpack_to_rootfs(cpio_srcbuf, len);
KUNIT_EXPECT_NULL(test, err);
for (i = 0; i < INITRAMFS_TEST_MANY_LIMIT; i++) {
sprintf(thispath, "initramfs_test_many-%d", i);
KUNIT_EXPECT_EQ(test, init_unlink(thispath), 0);
}
kfree(cpio_srcbuf);
}
/*
* An initramfs filename is namesize in length, including the zero-terminator.
* A filename can be zero-terminated prior to namesize, with the remainder used
* as padding. This can be useful for e.g. alignment of file data segments with
* a 4KB filesystem block, allowing for extent sharing (reflinks) between cpio
* source and destination. This hack works with both GNU cpio and initramfs, as
* long as PATH_MAX isn't exceeded.
*/
static void __init initramfs_test_fname_pad(struct kunit *test)
{
char *err;
size_t len;
struct file *file;
char fdata[] = "this file data is aligned at 4K in the archive";
struct test_fname_pad {
char padded_fname[4096 - CPIO_HDRLEN];
char cpio_srcbuf[CPIO_HDRLEN + PATH_MAX + 3 + sizeof(fdata)];
} *tbufs = kzalloc(sizeof(struct test_fname_pad), GFP_KERNEL);
struct initramfs_test_cpio c[] = { {
.magic = "070701",
.ino = 1,
.mode = S_IFREG | 0777,
.uid = 0,
.gid = 0,
.nlink = 1,
.mtime = 1,
.filesize = sizeof(fdata),
.devmajor = 0,
.devminor = 1,
.rdevmajor = 0,
.rdevminor = 0,
/* align file data at 4K archive offset via padded fname */
.namesize = 4096 - CPIO_HDRLEN,
.csum = 0,
.fname = tbufs->padded_fname,
.data = fdata,
} };
memcpy(tbufs->padded_fname, "padded_fname", sizeof("padded_fname"));
len = fill_cpio(c, ARRAY_SIZE(c), tbufs->cpio_srcbuf);
err = unpack_to_rootfs(tbufs->cpio_srcbuf, len);
KUNIT_EXPECT_NULL(test, err);
file = filp_open(c[0].fname, O_RDONLY, 0);
if (IS_ERR(file)) {
KUNIT_FAIL(test, "open failed");
goto out;
}
/* read back file contents into @cpio_srcbuf and confirm match */
len = kernel_read(file, tbufs->cpio_srcbuf, c[0].filesize, NULL);
KUNIT_EXPECT_EQ(test, len, c[0].filesize);
KUNIT_EXPECT_MEMEQ(test, tbufs->cpio_srcbuf, c[0].data, len);
fput(file);
KUNIT_EXPECT_EQ(test, init_unlink(c[0].fname), 0);
out:
kfree(tbufs);
}
/*
* The kunit_case/_suite struct cannot be marked as __initdata as this will be
* used in debugfs to retrieve results after test has run.
*/
static struct kunit_case __refdata initramfs_test_cases[] = {
KUNIT_CASE(initramfs_test_extract),
KUNIT_CASE(initramfs_test_fname_overrun),
KUNIT_CASE(initramfs_test_data),
KUNIT_CASE(initramfs_test_csum),
KUNIT_CASE(initramfs_test_hardlink),
KUNIT_CASE(initramfs_test_many),
KUNIT_CASE(initramfs_test_fname_pad),
{},
};
static struct kunit_suite initramfs_test_suite = {
.name = "initramfs",
.test_cases = initramfs_test_cases,
};
kunit_test_init_section_suites(&initramfs_test_suite);
MODULE_DESCRIPTION("Initramfs KUnit test suite");
MODULE_LICENSE("GPL v2");