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(parent: 384d379) | patch
static_call,x86: Robustify trampoline patching
authorPeter Zijlstra <peterz@infradead.org>
Sat, 30 Oct 2021 07:47:58 +0000 (09:47 +0200)
committerPeter Zijlstra <peterz@infradead.org>
Thu, 11 Nov 2021 12:09:31 +0000 (13:09 +0100)
commitd1c8453a87a54d8beed3ea3651f0a6ee91960811
tree04dd3c3a9a55be81189d30054b015b2587dc5968tree | snapshot
parent384d379616191cf9c80fdc5c52fa55fa2c58a3a0commit | diff
static_call,x86: Robustify trampoline patching

Add a few signature bytes after the static call trampoline and verify
those bytes match before patching the trampoline. This avoids patching
random other JMPs (such as CFI jump-table entries) instead.

These bytes decode as:

   d:   53                      push   %rbx
   e:   43 54                   rex.XB push %r12

And happen to spell "SCT".

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20211030074758.GT174703@worktop.programming.kicks-ass.net
arch/x86/include/asm/static_call.h diff | blob | history
arch/x86/kernel/static_call.c diff | blob | history
tools/objtool/check.c diff | blob | history
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