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Kernel: fix filp_open in kernel below 4.9 (#822)

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Use current_cred()->session_keyring to check whether session_keyring
installed or not. close #814
This commit is contained in:
The_second_Tom
2023-08-01 20:51:32 +08:00
committed by GitHub
parent 907bcad1a7
commit a83390b0ec
1 changed files with 1 additions and 3 deletions
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4
kernel/kernel_compat.c
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@@ -77,12 +77,10 @@ void ksu_android_ns_fs_check()
struct file *ksu_filp_open_compat(const char *filename, int flags, umode_t mode) struct file *ksu_filp_open_compat(const char *filename, int flags, umode_t mode)
{ {
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0) #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)
static bool keyring_installed = false; if (init_session_keyring != NULL && !current_cred()->session_keyring &&
if (init_session_keyring != NULL && !keyring_installed &&
(current->flags & PF_WQ_WORKER)) { (current->flags & PF_WQ_WORKER)) {
pr_info("installing init session keyring for older kernel\n"); pr_info("installing init session keyring for older kernel\n");
install_session_keyring(init_session_keyring); install_session_keyring(init_session_keyring);
keyring_installed = true;
} }
#endif #endif
// switch mnt_ns even if current is not wq_worker, to ensure what we open is the correct file in android mnt_ns, rather than user created mnt_ns // switch mnt_ns even if current is not wq_worker, to ensure what we open is the correct file in android mnt_ns, rather than user created mnt_ns