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    Subject[PATCH 4.9 228/329] sh: fix debug trap failure to process signals before return to user
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Rich Felker <dalias@libc.org>

    [ Upstream commit 96a598996f6ac518ac79839ecbb17c91af91f4f7 ]

    When responding to a debug trap (breakpoint) in userspace, the
    kernel's trap handler raised SIGTRAP but returned from the trap via a
    code path that ignored pending signals, resulting in an infinite loop
    re-executing the trapping instruction.

    Signed-off-by: Rich Felker <dalias@libc.org>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/sh/kernel/entry-common.S | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/arch/sh/kernel/entry-common.S
    +++ b/arch/sh/kernel/entry-common.S
    @@ -255,7 +255,7 @@ debug_trap:
    mov.l @r8, r8
    jsr @r8
    nop
    - bra __restore_all
    + bra ret_from_exception
    nop
    CFI_ENDPROC


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