Commit e3c2b10d authored Jul 01, 2023 by Linus Torvalds

linux

Pull arm64 fix from Catalin Marinas:
 "Fix memory corruption (overwriting the kmalloc redzone) when saving
  the SVE state while in SVE streaming mode"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: sme: Use STR P to clear FFR context field in streaming SVE mode

parents d25f0025 893b2418

arch/arm64/include/asm/fpsimdmacros.h

+3 −3

Original line number	Diff line number	Diff line
		@@ -316,12 +316,12 @@
		_for n, 0, 15, _sve_str_p \n, \nxbase, \n - 16
		cbz \save_ffr, 921f
		_sve_rdffr 0
		_sve_str_p 0, \nxbase
		_sve_ldr_p 0, \nxbase, -16
		b 922f
		921:
		str xzr, [x\nxbase] // Zero out FFR
		_sve_pfalse 0 // Zero out FFR
		922:
		_sve_str_p 0, \nxbase
		_sve_ldr_p 0, \nxbase, -16
		mrs x\nxtmp, fpsr
		str w\nxtmp, [\xpfpsr]
		mrs x\nxtmp, fpcr