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x86/alternatives: Assert that smp_text_poke_int3_handler() can only ever handle 'tp_vec[]' based requests

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Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250411054105.2341982-26-mingo@kernel.org
This commit is contained in:
Ingo Molnar 2025-04-11 07:40:37 +02:00
parent c8976ade0c
commit 476ad071c6
1 changed files with 6 additions and 4 deletions
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10
arch/x86/kernel/alternative.c
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@ -2510,6 +2510,10 @@ static __always_inline int patch_cmp(const void *key, const void *elt)
return 0;
}
#define TP_VEC_MAX (PAGE_SIZE / sizeof(struct smp_text_poke_loc))
static struct smp_text_poke_loc tp_vec[TP_VEC_MAX];
static int tp_vec_nr;
noinstr int smp_text_poke_int3_handler(struct pt_regs *regs)
{
struct text_poke_int3_vec *desc;
@ -2534,6 +2538,8 @@ noinstr int smp_text_poke_int3_handler(struct pt_regs *regs)
if (!desc)
return 0;
WARN_ON_ONCE(desc->vec != tp_vec);
/*
* Discount the INT3. See smp_text_poke_batch_process().
*/
@ -2592,10 +2598,6 @@ noinstr int smp_text_poke_int3_handler(struct pt_regs *regs)
return ret;
}
#define TP_VEC_MAX (PAGE_SIZE / sizeof(struct smp_text_poke_loc))
static struct smp_text_poke_loc tp_vec[TP_VEC_MAX];
static int tp_vec_nr;
/**
* smp_text_poke_batch_process() -- update instructions on live kernel on SMP
* @tp: vector of instructions to patch