• Andrey Ryabinin's avatar
    fs: dcache: manually unpoison dname after allocation to shut up kasan's reports · df4c0e36
    Andrey Ryabinin authored
    We need to manually unpoison rounded up allocation size for dname to avoid
    kasan's reports in dentry_string_cmp().  When CONFIG_DCACHE_WORD_ACCESS=y
    dentry_string_cmp may access few bytes beyound requested in kmalloc()
    size.
    
    dentry_string_cmp() relates on that fact that dentry allocated using
    kmalloc and kmalloc internally round up allocation size.  So this is not a
    bug, but this makes kasan to complain about such accesses.  To avoid such
    reports we mark rounded up allocation size in shadow as accessible.
    Signed-off-by: default avatarAndrey Ryabinin <a.ryabinin@samsung.com>
    Reported-by: default avatarDmitry Vyukov <dvyukov@google.com>
    Cc: Konstantin Serebryany <kcc@google.com>
    Cc: Dmitry Chernenkov <dmitryc@google.com>
    Signed-off-by: default avatarAndrey Konovalov <adech.fo@gmail.com>
    Cc: Yuri Gribov <tetra2005@gmail.com>
    Cc: Konstantin Khlebnikov <koct9i@gmail.com>
    Cc: Sasha Levin <sasha.levin@oracle.com>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Andi Kleen <andi@firstfloor.org>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Pekka Enberg <penberg@kernel.org>
    Cc: David Rientjes <rientjes@google.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    df4c0e36
dcache.c 86 KB