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kernel: handle optional backports (#99)

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Cherry pick from 8bb9518060 a4a7db7f40

Backporting is cool, but not everyone has the skills for it.
This commit does NOT make it required, but it will allow compiler
to use whats in-kernel if it exists.

The following are backportable:
 - kernel_read / kernel_write
 	< 4.14, backport chain, tested on 4.9
 	e13ec939e9
	bdd1d2d3d2
	c41fbad015
	ac452acae1

 - strncpy_from_user_nofault
 	for 5.4, apply: bd88bb5d40
 	for 4.x, apply: 424e21f3b0
 	for any failures, just SKIP THIS or check dependency chain of, 3d7081822f
 		this got backported to v4.4.236, v4.9.236, v4.14.197, v4.19.144

- hint, `curl $url.patch | git am`

Signed-off-by: backslashxx <118538522+backslashxx@users.noreply.github.com>
This commit is contained in:
backslashxx
2025-01-28 16:53:35 +08:00
committed by GitHub
parent 3a8f4a2596
commit ae36e2085c
2 changed files with 15 additions and 3 deletions
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6
kernel/kernel_compat.c
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@@ -107,7 +107,7 @@ struct file *ksu_filp_open_compat(const char *filename, int flags, umode_t mode)
ssize_t ksu_kernel_read_compat(struct file *p, void *buf, size_t count,
loff_t *pos)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0) || defined(KSU_KERNEL_READ)
return kernel_read(p, buf, count, pos);
#else
loff_t offset = pos ? *pos : 0;
@@ -122,7 +122,7 @@ ssize_t ksu_kernel_read_compat(struct file *p, void *buf, size_t count,
ssize_t ksu_kernel_write_compat(struct file *p, const void *buf, size_t count,
loff_t *pos)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0) || defined(KSU_KERNEL_WRITE)
return kernel_write(p, buf, count, pos);
#else
loff_t offset = pos ? *pos : 0;
@@ -134,7 +134,7 @@ ssize_t ksu_kernel_write_compat(struct file *p, const void *buf, size_t count,
#endif
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 8, 0) || defined(KSU_STRNCPY_FROM_USER_NOFAULT)
long ksu_strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
long count)
{