diff options
| author | Jiri Olsa <jolsa@kernel.org> | 2024-06-12 08:44:27 +0900 |
|---|---|---|
| committer | Masami Hiramatsu (Google) <mhiramat@kernel.org> | 2024-06-12 08:44:27 +0900 |
| commit | 1713b63a07a28a475de94664f783b4cfd2e4fa90 (patch) | |
| tree | 7abbd076ad664d9ac4299b4a07e1b6a3276b1fd1 /arch/x86/include/asm/shstk.h | |
| parent | 1b3c86eeea7594eeeb49b8d1c1db0a40f0ce7920 (diff) | |
x86/shstk: Make return uprobe work with shadow stack
Currently the application with enabled shadow stack will crash
if it sets up return uprobe. The reason is the uretprobe kernel
code changes the user space task's stack, but does not update
shadow stack accordingly.
Adding new functions to update values on shadow stack and using
them in uprobe code to keep shadow stack in sync with uretprobe
changes to user stack.
Link: https://lore.kernel.org/all/20240611112158.40795-2-jolsa@kernel.org/
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Fixes: 488af8ea7131 ("x86/shstk: Wire in shadow stack interface")
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/shstk.h')
| -rw-r--r-- | arch/x86/include/asm/shstk.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/include/asm/shstk.h b/arch/x86/include/asm/shstk.h index 42fee8959df7..896909f306e3 100644 --- a/arch/x86/include/asm/shstk.h +++ b/arch/x86/include/asm/shstk.h @@ -21,6 +21,7 @@ unsigned long shstk_alloc_thread_stack(struct task_struct *p, unsigned long clon void shstk_free(struct task_struct *p); int setup_signal_shadow_stack(struct ksignal *ksig); int restore_signal_shadow_stack(void); +int shstk_update_last_frame(unsigned long val); #else static inline long shstk_prctl(struct task_struct *task, int option, unsigned long arg2) { return -EINVAL; } @@ -31,6 +32,7 @@ static inline unsigned long shstk_alloc_thread_stack(struct task_struct *p, static inline void shstk_free(struct task_struct *p) {} static inline int setup_signal_shadow_stack(struct ksignal *ksig) { return 0; } static inline int restore_signal_shadow_stack(void) { return 0; } +static inline int shstk_update_last_frame(unsigned long val) { return 0; } #endif /* CONFIG_X86_USER_SHADOW_STACK */ #endif /* __ASSEMBLY__ */ |