Messages in this thread Patch in this message | | | Date | Sat, 02 Dec 2023 13:08:12 -0000 | From | "tip-bot2 for Uros Bizjak" <> | Subject | [tip: x86/percpu] x86/callthunks: Correct calculation of dest address in is_callthunk() |
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The following commit has been merged into the x86/percpu branch of tip:
Commit-ID: fc50065325f8b88d6986f089ae103b5db858ab96 Gitweb: https://git.kernel.org/tip/fc50065325f8b88d6986f089ae103b5db858ab96 Author: Uros Bizjak <ubizjak@gmail.com> AuthorDate: Fri, 01 Dec 2023 09:57:27 +01:00 Committer: Ingo Molnar <mingo@kernel.org> CommitterDate: Sat, 02 Dec 2023 10:51:28 +01:00
x86/callthunks: Correct calculation of dest address in is_callthunk()
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: 17bce3b2ae2d ("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 --- arch/x86/kernel/callthunks.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/callthunks.c b/arch/x86/kernel/callthunks.c index f56fa30..2324c7f 100644 --- a/arch/x86/kernel/callthunks.c +++ b/arch/x86/kernel/callthunks.c @@ -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,
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