Revision 14d6d86c210aea1a83c19a8f6391ecabcbefed94 authored by Alexei Starovoitov on 19 November 2020, 18:45:55 UTC, committed by Alexei Starovoitov on 19 November 2020, 19:58:15 UTC
Daniel Xu says: ==================== 6ae08ae3dea2 ("bpf: Add probe_read_{user, kernel} and probe_read_{user, kernel}_str helpers") introduced a subtle bug where bpf_probe_read_user_str() would potentially copy a few extra bytes after the NUL terminator. This issue is particularly nefarious when strings are used as map keys, as seemingly identical strings can occupy multiple entries in a map. This patchset fixes the issue and introduces a selftest to prevent future regressions. v6 -> v7: * Add comments v5 -> v6: * zero-pad up to sizeof(unsigned long) after NUL v4 -> v5: * don't read potentially uninitialized memory v3 -> v4: * directly pass userspace pointer to prog * test more strings of different length v2 -> v3: * set pid filter before attaching prog in selftest * use long instead of int as bpf_probe_read_user_str() retval * style changes v1 -> v2: * add Fixes: tag * add selftest ==================== Signed-off-by: Alexei Starovoitov <ast@kernel.org>
xen.config
# global stuff - these enable us to allow some
# of the not so generic stuff below for xen
CONFIG_PARAVIRT=y
CONFIG_NET=y
CONFIG_NET_CORE=y
CONFIG_NETDEVICES=y
CONFIG_BLOCK=y
CONFIG_WATCHDOG=y
CONFIG_TARGET_CORE=y
CONFIG_SCSI=y
CONFIG_FB=y
CONFIG_INPUT_MISC=y
CONFIG_MEMORY_HOTPLUG=y
CONFIG_TTY=y
# Technically not required but otherwise produces
# pretty useless systems starting from allnoconfig
# You want TCP/IP and ELF binaries right?
CONFIG_INET=y
CONFIG_BINFMT_ELF=y
# generic config
CONFIG_XEN=y
CONFIG_XEN_DOM0=y
# backend drivers
CONFIG_XEN_BACKEND=y
CONFIG_XEN_BLKDEV_BACKEND=m
CONFIG_XEN_NETDEV_BACKEND=m
CONFIG_HVC_XEN=y
CONFIG_XEN_WDT=m
CONFIG_XEN_SCSI_BACKEND=m
# frontend drivers
CONFIG_XEN_FBDEV_FRONTEND=m
CONFIG_HVC_XEN_FRONTEND=y
CONFIG_INPUT_XEN_KBDDEV_FRONTEND=m
CONFIG_XEN_SCSI_FRONTEND=m
# others
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=m
CONFIG_XEN_BLKDEV_FRONTEND=m
CONFIG_XEN_NETDEV_FRONTEND=m
CONFIG_XENFS=m
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y
CONFIG_XEN_XENBUS_FRONTEND=y
CONFIG_XEN_GNTDEV=m
CONFIG_XEN_GRANT_DEV_ALLOC=m
CONFIG_SWIOTLB_XEN=y
CONFIG_XEN_PRIVCMD=m
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