MGASA-2021-0053

Security fixes:

• fix buffer overrun in EUC-KR conversion module [bz #2497] (CVE-2019-25013)
• arm: CVE-2020-6096: Fix multiarch memcpy for negative length [BZ #25620]
• arm: CVE-2020-6096: fix memcpy and memmove for negative length [BZ #25620]
• iconv: Fix incorrect UCS4 inner loop bounds [BZ #26923] (CVE-2020-29562) other upstream fixes:
• libio: Disable vtable validation for pre-2.1 interposed handles [BZ #25203]
• string.h: Define __CORRECT_ISO_CPP_STRING_H_PROTO for Clang [BZ #25232]
• misc/test-errno-linux: Handle EINVAL from quotactl
• nss_compat: internal_end*ent may clobber errno, hiding ERANGE [BZ #25976]
• Fix avx2 strncmp offset compare condition check [BZ #25933]
• AArch64: Align ENTRY to a cacheline
• AArch64: Add optimized Q-register memcpy
• AArch64: Improve backwards memmove performance
• AArch64: Rename IS_ARES to IS_NEOVERSE_N1
• AArch64: Increase small and medium cases for __memcpy_generic
• AArch64: Improve integer memcpy
• AArch64: Use __memcpy_simd on Neoverse N2/V1
• AArch64: Fix DT_AARCH64_VARIANT_PCS handling [BZ #26798]
• AArch64: fix stack missing after sp is updated
• x86-64: Avoid rep movsb with short distance [BZ #27130]
• x86: Assume --enable-cet if GCC defaults to CET [BZ #25225]
• x86: Check IFUNC definition in unrelocated executable [BZ #20019]
• x86: Set header.feature_1 in TCB for always-on CET [BZ #27177]
• Fix parsing of /sys/devices/system/cpu/online [BZ #25859]
• Use O_CLOEXEC in sysconf [BZ #26791]