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initramfs_test: kunit test for cpio.filesize > PATH_MAX

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initramfs unpack skips over cpio entries where namesize > PATH_MAX,
instead of returning an error. Add coverage for this behaviour.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Link: https://patch.msgid.link/20260114135051.4943-2-ddiss@suse.de
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Disseldorp
2026-01-15 00:50:52 +11:00
committed by Christian Brauner
parent 7c02250033
commit aaf7683961
1 changed files with 48 additions and 0 deletions
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48
init/initramfs_test.c
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@@ -447,6 +447,53 @@ out:
kfree(tbufs);
}
static void __init initramfs_test_fname_path_max(struct kunit *test)
{
char *err;
size_t len;
struct kstat st0, st1;
char fdata[] = "this file data will not be unpacked";
struct test_fname_path_max {
char fname_oversize[PATH_MAX + 1];
char fname_ok[PATH_MAX];
char cpio_src[(CPIO_HDRLEN + PATH_MAX + 3 + sizeof(fdata)) * 2];
} *tbufs = kzalloc(sizeof(struct test_fname_path_max), GFP_KERNEL);
struct initramfs_test_cpio c[] = { {
.magic = "070701",
.ino = 1,
.mode = S_IFDIR | 0777,
.nlink = 1,
.namesize = sizeof(tbufs->fname_oversize),
.fname = tbufs->fname_oversize,
.filesize = sizeof(fdata),
.data = fdata,
}, {
.magic = "070701",
.ino = 2,
.mode = S_IFDIR | 0777,
.nlink = 1,
.namesize = sizeof(tbufs->fname_ok),
.fname = tbufs->fname_ok,
} };
memset(tbufs->fname_oversize, '/', sizeof(tbufs->fname_oversize) - 1);
memset(tbufs->fname_ok, '/', sizeof(tbufs->fname_ok) - 1);
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);
/* unpack skips over fname_oversize instead of returning an error */
err = unpack_to_rootfs(tbufs->cpio_src, len);
KUNIT_EXPECT_NULL(test, err);
KUNIT_EXPECT_EQ(test, init_stat("fname_oversize", &st0, 0), -ENOENT);
KUNIT_EXPECT_EQ(test, init_stat("fname_ok", &st1, 0), 0);
KUNIT_EXPECT_EQ(test, init_rmdir("fname_ok"), 0);
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.
@@ -459,6 +506,7 @@ static struct kunit_case __refdata initramfs_test_cases[] = {
KUNIT_CASE(initramfs_test_hardlink),
KUNIT_CASE(initramfs_test_many),
KUNIT_CASE(initramfs_test_fname_pad),
KUNIT_CASE(initramfs_test_fname_path_max),
{},
};