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Revert "x86/ftrace: Use alternative RET encoding"

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This reverts commit 3eb602ad6a.

Revert the backport of upstream commit

  1f001e9da6 ("x86/ftrace: Use alternative RET encoding")

in favor of a proper backport after backporting the commit which adds
__text_gen_insn().

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Borislav Petkov (AMD) 2024-02-22 13:46:09 +01:00 committed by Greg Kroah-Hartman
parent 70d92abbe2
commit c13d426040
1 changed files with 2 additions and 7 deletions
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9
arch/x86/kernel/ftrace.c
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@ -311,7 +311,7 @@ union ftrace_op_code_union {
} __attribute__((packed));
};
#define RET_SIZE (IS_ENABLED(CONFIG_RETPOLINE) ? 5 : 1 + IS_ENABLED(CONFIG_SLS))
#define RET_SIZE 1 + IS_ENABLED(CONFIG_SLS)
static unsigned long
create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)
@ -367,12 +367,7 @@ create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)
goto fail;
ip = trampoline + size;
/* The trampoline ends with ret(q) */
if (cpu_feature_enabled(X86_FEATURE_RETHUNK))
memcpy(ip, text_gen_insn(JMP32_INSN_OPCODE, ip, &__x86_return_thunk), JMP32_INSN_SIZE);
else
memcpy(ip, retq, sizeof(retq));
memcpy(ip, retq, RET_SIZE);
/* No need to test direct calls on created trampolines */
if (ops->flags & FTRACE_OPS_FL_SAVE_REGS) {