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x86/callthunks: Correct calculation of dest address in is_callthunk()

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GCC didn't warn on the invalid use of relocation destination
pointer, so the calculated destination value was applied to
the uninitialized pointer location in error.

Fixes: 17bce3b2ae ("x86/callthunks: Handle %rip-relative relocations in call thunk template")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Closes: https://lore.kernel.org/lkml/20231201035457.GA321497@dev-arch.thelio-3990X/
Link: https://lore.kernel.org/r/20231201085727.3647051-1-ubizjak@gmail.com
This commit is contained in:
Uros Bizjak 2023-12-01 09:57:27 +01:00 committed by Ingo Molnar
parent 9e9d673b2c
commit fc50065325
1 changed files with 1 additions and 1 deletions
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arch/x86/kernel/callthunks.c
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@ -312,7 +312,7 @@ static bool is_callthunk(void *addr)
if (!thunks_initialized || skip_addr((void *)dest))
return false;
*pad = dest - tmpl_size;
pad = (void *)(dest - tmpl_size);
memcpy(insn_buff, skl_call_thunk_template, tmpl_size);
apply_relocation(insn_buff, tmpl_size, pad,