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81f4f09d0c
* ksud: Address pagefault in ksu_handle_execveat_ksud As pointed out by @backslashxx, when strncpy pagefaults, it causes the first_arg to be completely NULL in some systems. This causes second_stage initialization to fail hence causing SU to be non-functional. This patch copies ksu_strncpy_from_user_retry from @backslashxx's commit:e2fe25e485This adds a fallback to perform a normal strncpy_from_user when nofault fails which allows us to get the first_arg in such cases. Co-authored-by: backslashxx <118538522+backslashxx@users.noreply.github.com> Signed-off-by: Edrick Sinsuan <evcsinsuan@gmail.com> * Revert "ksud: Add second_stage init variant (#653)" This reverts commitc6b60a24e8. --------- Signed-off-by: Edrick Sinsuan <evcsinsuan@gmail.com> Co-authored-by: backslashxx <118538522+backslashxx@users.noreply.github.com>
43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
#ifndef __KSU_H_KERNEL_COMPAT
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#define __KSU_H_KERNEL_COMPAT
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#include <linux/fs.h>
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#include <linux/version.h>
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#include "ss/policydb.h"
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#include "linux/key.h"
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/*
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* Adapt to Huawei HISI kernel without affecting other kernels ,
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* Huawei Hisi Kernel EBITMAP Enable or Disable Flag ,
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* From ss/ebitmap.h
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*/
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)) && \
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(LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)) || \
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(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)) && \
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(LINUX_VERSION_CODE < KERNEL_VERSION(4, 15, 0))
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#ifdef HISI_SELINUX_EBITMAP_RO
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#define CONFIG_IS_HW_HISI
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#endif
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#endif
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extern long ksu_strncpy_from_user_nofault(char *dst,
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const void __user *unsafe_addr,
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long count);
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extern long ksu_strncpy_from_user_retry(char *dst,
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const void __user *unsafe_addr,
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long count);
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) || defined(CONFIG_IS_HW_HISI) || defined(CONFIG_KSU_ALLOWLIST_WORKAROUND)
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extern struct key *init_session_keyring;
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#endif
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extern void ksu_android_ns_fs_check();
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extern struct file *ksu_filp_open_compat(const char *filename, int flags,
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umode_t mode);
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extern ssize_t ksu_kernel_read_compat(struct file *p, void *buf, size_t count,
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loff_t *pos);
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extern ssize_t ksu_kernel_write_compat(struct file *p, const void *buf,
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size_t count, loff_t *pos);
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#endif
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