diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2022-09-15 14:11:34 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-10-17 17:41:18 +0300 |
| commit | b2e9dfe54be4d023124d588d6f03d16a9c0d2507 (patch) | |
| tree | 8f1e2c50ab4cd7cec00b3dff8764e2f2e6dbb035 /arch/x86/include/asm/alternative.h | |
| parent | 396e0b8e09e86440c2119d12c2101110d3cd5bf9 (diff) | |
| download | linux-b2e9dfe54be4d023124d588d6f03d16a9c0d2507.tar.xz | |
x86/bpf: Emit call depth accounting if required
Ensure that calls in BPF jitted programs are emitting call depth accounting
when enabled to keep the call/return balanced. The return thunk jump is
already injected due to the earlier retbleed mitigations.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220915111148.615413406@infradead.org
Diffstat (limited to 'arch/x86/include/asm/alternative.h')
| -rw-r--r-- | arch/x86/include/asm/alternative.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h index 4b8cd256c95e..664c0779375c 100644 --- a/arch/x86/include/asm/alternative.h +++ b/arch/x86/include/asm/alternative.h @@ -93,6 +93,7 @@ extern void callthunks_patch_module_calls(struct callthunk_sites *sites, struct module *mod); extern void *callthunks_translate_call_dest(void *dest); extern bool is_callthunk(void *addr); +extern int x86_call_depth_emit_accounting(u8 **pprog, void *func); #else static __always_inline void callthunks_patch_builtin_calls(void) {} static __always_inline void @@ -106,6 +107,11 @@ static __always_inline bool is_callthunk(void *addr) { return false; } +static __always_inline int x86_call_depth_emit_accounting(u8 **pprog, + void *func) +{ + return 0; +} #endif #ifdef CONFIG_SMP |