[Bug 1059075] -fstack-clash-protection writes beyond array bounds

http://bugzilla.suse.com/show_bug.cgi?id=1059075 http://bugzilla.suse.com/show_bug.cgi?id=1059075#c8

--- Comment #8 from Andreas Schwab schwab@suse.com --- For "char *dir = strdupa (aux_cache_name);" it generates an insn with unpredictable behavior:

mov r0, r5 bl strlen(PLT) add r3, r0, #15 add r2, r0, #1 bic r3, r3, #7 cmp r3, #4096 bcc .L281 .L320: sub r3, r3, #4096 sub sp, sp, #4096 cmp r3, #4096 str r0, [sp] bcs .L320 .L281: sub sp, sp, r3 ldr r1, [fp, #-172] mov r0, sp str r0, [r0], #7 <====== bic r0, r0, #7 bl memcpy(PLT)

cache.s:2116: Warning: source register same as write-back base