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kernel: backport to 4.4 (#166)

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These changes make KernelSU work on kernel4.4
[link](https://github.com/F-19-F/android_kernel_oneplus_msm8998).
LINUX_VERSION_CODE macro changes have been vertied on 4.4 4.9 4.14.
For kernel 4.4,just pick two commits
* [introduce
KernelSU](2993524f2f)
* [allow init exec ksud under
nosuid](3df9df42a6)
This commit is contained in:
f19
2023-02-01 19:48:36 +08:00
committed by GitHub
parent 417ff8a6c5
commit 4f2b8b7077
10 changed files with 104 additions and 32 deletions
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33
kernel/apk_sign.c
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@@ -3,6 +3,7 @@
#include "apk_sign.h"
#include "klog.h" // IWYU pragma: keep
#include "kernel_compat.h"
static __always_inline int
check_v2_signature(char *path, unsigned expected_size, unsigned expected_hash)
@@ -25,10 +26,10 @@ check_v2_signature(char *path, unsigned expected_size, unsigned expected_hash)
for (int i = 0;; ++i) {
unsigned short n;
pos = generic_file_llseek(fp, -i - 2, SEEK_END);
kernel_read(fp, &n, 2, &pos);
kernel_read_compat(fp, &n, 2, &pos);
if (n == i) {
pos -= 22;
kernel_read(fp, &size4, 4, &pos);
kernel_read_compat(fp, &size4, 4, &pos);
if ((size4 ^ 0xcafebabeu) == 0xccfbf1eeu) {
break;
}
@@ -41,17 +42,17 @@ check_v2_signature(char *path, unsigned expected_size, unsigned expected_hash)
pos += 12;
// offset
kernel_read(fp, &size4, 0x4, &pos);
kernel_read_compat(fp, &size4, 0x4, &pos);
pos = size4 - 0x18;
kernel_read(fp, &size8, 0x8, &pos);
kernel_read(fp, buffer, 0x10, &pos);
kernel_read_compat(fp, &size8, 0x8, &pos);
kernel_read_compat(fp, buffer, 0x10, &pos);
if (strcmp((char *)buffer, "APK Sig Block 42")) {
goto clean;
}
pos = size4 - (size8 + 0x8);
kernel_read(fp, &size_of_block, 0x8, &pos);
kernel_read_compat(fp, &size_of_block, 0x8, &pos);
if (size_of_block != size8) {
goto clean;
}
@@ -59,37 +60,37 @@ check_v2_signature(char *path, unsigned expected_size, unsigned expected_hash)
for (;;) {
uint32_t id;
uint32_t offset;
kernel_read(fp, &size8, 0x8, &pos); // sequence length
kernel_read_compat(fp, &size8, 0x8, &pos); // sequence length
if (size8 == size_of_block) {
break;
}
kernel_read(fp, &id, 0x4, &pos); // id
kernel_read_compat(fp, &id, 0x4, &pos); // id
offset = 4;
pr_info("id: 0x%08x\n", id);
if ((id ^ 0xdeadbeefu) == 0xafa439f5u ||
(id ^ 0xdeadbeefu) == 0x2efed62f) {
kernel_read(fp, &size4, 0x4,
kernel_read_compat(fp, &size4, 0x4,
&pos); // signer-sequence length
kernel_read(fp, &size4, 0x4, &pos); // signer length
kernel_read(fp, &size4, 0x4,
kernel_read_compat(fp, &size4, 0x4, &pos); // signer length
kernel_read_compat(fp, &size4, 0x4,
&pos); // signed data length
offset += 0x4 * 3;
kernel_read(fp, &size4, 0x4,
kernel_read_compat(fp, &size4, 0x4,
&pos); // digests-sequence length
pos += size4;
offset += 0x4 + size4;
kernel_read(fp, &size4, 0x4,
kernel_read_compat(fp, &size4, 0x4,
&pos); // certificates length
kernel_read(fp, &size4, 0x4,
kernel_read_compat(fp, &size4, 0x4,
&pos); // certificate length
offset += 0x4 * 2;
#if 0
int hash = 1;
signed char c;
for (unsigned i = 0; i < size4; ++i) {
kernel_read(fp, &c, 0x1, &pos);
kernel_read_compat(fp, &c, 0x1, &pos);
hash = 31 * hash + c;
}
offset += size4;
@@ -99,7 +100,7 @@ check_v2_signature(char *path, unsigned expected_size, unsigned expected_hash)
int hash = 1;
signed char c;
for (unsigned i = 0; i < size4; ++i) {
kernel_read(fp, &c, 0x1, &pos);
kernel_read_compat(fp, &c, 0x1, &pos);
hash = 31 * hash + c;
}
offset += size4;