4.19-stable review patch. If anyone has any objections, please let me know.
------------------ From: Kees Cook <keesc...@chromium.org> commit e46daee53bb50bde38805f1823a182979724c229 upstream. The arm compiler internally interprets an inline assembly label as an unsigned long value, not a pointer. As a result, under CONFIG_FORTIFY_SOURCE, the address of a label has a size of 4 bytes, which was tripping the runtime checks. Instead, we can just cast the label (as done with the size calculations earlier). Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1639397 Reported-by: William Cohen <wco...@redhat.com> Fixes: 6974f0c4555e ("include/linux/string.h: add the option of fortified string.h functions") Cc: sta...@vger.kernel.org Acked-by: Laura Abbott <labb...@redhat.com> Acked-by: Masami Hiramatsu <mhira...@kernel.org> Tested-by: William Cohen <wco...@redhat.com> Signed-off-by: Kees Cook <keesc...@chromium.org> Signed-off-by: Russell King <rmk+ker...@armlinux.org.uk> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- arch/arm/probes/kprobes/opt-arm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/arm/probes/kprobes/opt-arm.c +++ b/arch/arm/probes/kprobes/opt-arm.c @@ -247,7 +247,7 @@ int arch_prepare_optimized_kprobe(struct } /* Copy arch-dep-instance from template. */ - memcpy(code, &optprobe_template_entry, + memcpy(code, (unsigned char *)optprobe_template_entry, TMPL_END_IDX * sizeof(kprobe_opcode_t)); /* Adjust buffer according to instruction. */
