• Sasha Levin's avatar
    SUNRPC: Prevent kernel stack corruption on long values of flush · 212ba906
    Sasha Levin authored
    The buffer size in read_flush() is too small for the longest possible values
    for it. This can lead to a kernel stack corruption:
    
    [   43.047329] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff833e64b4
    [   43.047329]
    [   43.049030] Pid: 6015, comm: trinity-child18 Tainted: G        W    3.5.0-rc7-next-20120716-sasha #221
    [   43.050038] Call Trace:
    [   43.050435]  [<ffffffff836c60c2>] panic+0xcd/0x1f4
    [   43.050931]  [<ffffffff833e64b4>] ? read_flush.isra.7+0xe4/0x100
    [   43.051602]  [<ffffffff810e94e6>] __stack_chk_fail+0x16/0x20
    [   43.052206]  [<ffffffff833e64b4>] read_flush.isra.7+0xe4/0x100
    [   43.052951]  [<ffffffff833e6500>] ? read_flush_pipefs+0x30/0x30
    [   43.053594]  [<ffffffff833e652c>] read_flush_procfs+0x2c/0x30
    [   43.053596]  [<ffffffff812b9a8c>] proc_reg_read+0x9c/0xd0
    [   43.053596]  [<ffffffff812b99f0>] ? proc_reg_write+0xd0/0xd0
    [   43.053596]  [<ffffffff81250d5b>] do_loop_readv_writev+0x4b/0x90
    [   43.053596]  [<ffffffff81250fd6>] do_readv_writev+0xf6/0x1d0
    [   43.053596]  [<ffffffff812510ee>] vfs_readv+0x3e/0x60
    [   43.053596]  [<ffffffff812511b8>] sys_readv+0x48/0xb0
    [   43.053596]  [<ffffffff8378167d>] system_call_fastpath+0x1a/0x1f
    Signed-off-by: default avatarSasha Levin <levinsasha928@gmail.com>
    Cc: stable@kernel.org
    Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
    212ba906
cache.c 43.4 KB