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initramfs_test: add fill_cpio() inject_ox parameter

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fill_cpio() uses sprintf() to write out the in-memory cpio archive from
an array of struct initramfs_test_cpio. This change allows callers to
modify the cpio sprintf() format string so that future tests can
intentionally corrupt the header with "0x" and "0X" prefixed fields.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Link: https://patch.msgid.link/20260331070519.5974-2-ddiss@suse.de
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Disseldorp 2026-03-31 17:57:31 +11:00 committed by Christian Brauner
parent a243a7b02e
commit 8d14fe78cb
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 23 additions and 13 deletions
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36
init/initramfs_test.c
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@ -27,7 +27,18 @@ struct initramfs_test_cpio {
char *data;
};
static size_t fill_cpio(struct initramfs_test_cpio *cs, size_t csz, char *out)
/* regular newc header format */
#define CPIO_HDR_FMT "%s%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%s"
/*
* Bogus newc header with "0x" prefixes on the uid, gid, and namesize values.
* parse_header()/simple_str[n]toul() accept this, contrary to the initramfs
* specification.
*/
#define CPIO_HDR_OX_INJECT \
"%s%08x%08x0x%06x0X%06x%08x%08x%08x%08x%08x%08x%08x0x%06x%08x%s"
static size_t fill_cpio(struct initramfs_test_cpio *cs, size_t csz,
bool inject_ox, char *out)
{
int i;
size_t off = 0;
@ -38,9 +49,8 @@ static size_t fill_cpio(struct initramfs_test_cpio *cs, size_t csz, char *out)
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",
thislen = sprintf(pos,
inject_ox ? CPIO_HDR_OX_INJECT : CPIO_HDR_FMT,
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,
@ -102,7 +112,7 @@ static void __init initramfs_test_extract(struct kunit *test)
/* +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);
len = fill_cpio(c, ARRAY_SIZE(c), false, cpio_srcbuf);
ktime_get_real_ts64(&ts_before);
err = unpack_to_rootfs(cpio_srcbuf, len);
@ -177,7 +187,7 @@ static void __init initramfs_test_fname_overrun(struct kunit *test)
/* 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);
len = fill_cpio(c, ARRAY_SIZE(c), false, cpio_srcbuf);
/* overwrite trailing fname terminator and padding */
suffix_off = len - 1;
while (cpio_srcbuf[suffix_off] == '\0') {
@ -219,7 +229,7 @@ static void __init initramfs_test_data(struct kunit *test)
cpio_srcbuf = kmalloc(CPIO_HDRLEN + c[0].namesize + c[0].filesize + 6,
GFP_KERNEL);
len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf);
len = fill_cpio(c, ARRAY_SIZE(c), false, cpio_srcbuf);
err = unpack_to_rootfs(cpio_srcbuf, len);
KUNIT_EXPECT_NULL(test, err);
@ -274,7 +284,7 @@ static void __init initramfs_test_csum(struct kunit *test)
cpio_srcbuf = kmalloc(8192, GFP_KERNEL);
len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf);
len = fill_cpio(c, ARRAY_SIZE(c), false, cpio_srcbuf);
err = unpack_to_rootfs(cpio_srcbuf, len);
KUNIT_EXPECT_NULL(test, err);
@ -284,7 +294,7 @@ static void __init initramfs_test_csum(struct kunit *test)
/* mess up the csum and confirm that unpack fails */
c[0].csum--;
len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf);
len = fill_cpio(c, ARRAY_SIZE(c), false, cpio_srcbuf);
err = unpack_to_rootfs(cpio_srcbuf, len);
KUNIT_EXPECT_NOT_NULL(test, err);
@ -330,7 +340,7 @@ static void __init initramfs_test_hardlink(struct kunit *test)
cpio_srcbuf = kmalloc(8192, GFP_KERNEL);
len = fill_cpio(c, ARRAY_SIZE(c), cpio_srcbuf);
len = fill_cpio(c, ARRAY_SIZE(c), false, cpio_srcbuf);
err = unpack_to_rootfs(cpio_srcbuf, len);
KUNIT_EXPECT_NULL(test, err);
@ -371,7 +381,7 @@ static void __init initramfs_test_many(struct kunit *test)
};
c.namesize = 1 + sprintf(thispath, "initramfs_test_many-%d", i);
p += fill_cpio(&c, 1, p);
p += fill_cpio(&c, 1, false, p);
}
len = p - cpio_srcbuf;
@ -425,7 +435,7 @@ static void __init initramfs_test_fname_pad(struct kunit *test)
} };
memcpy(tbufs->padded_fname, "padded_fname", sizeof("padded_fname"));
len = fill_cpio(c, ARRAY_SIZE(c), tbufs->cpio_srcbuf);
len = fill_cpio(c, ARRAY_SIZE(c), false, tbufs->cpio_srcbuf);
err = unpack_to_rootfs(tbufs->cpio_srcbuf, len);
KUNIT_EXPECT_NULL(test, err);
@ -481,7 +491,7 @@ static void __init initramfs_test_fname_path_max(struct kunit *test)
memcpy(tbufs->fname_oversize, "fname_oversize",
sizeof("fname_oversize") - 1);
memcpy(tbufs->fname_ok, "fname_ok", sizeof("fname_ok") - 1);
len = fill_cpio(c, ARRAY_SIZE(c), tbufs->cpio_src);
len = fill_cpio(c, ARRAY_SIZE(c), false, tbufs->cpio_src);
/* unpack skips over fname_oversize instead of returning an error */
err = unpack_to_rootfs(tbufs->cpio_src, len);