lkml.org 
[lkml]   [2006]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    From
    Date
    Subject[PATCH -mm 3/7] add execns syscall to x86_64
    This patch adds the execns() syscall to the x86_64 architecture.

    Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
    Cc: Andrew Morton <akpm@osdl.org>
    Cc: Kirill Korotaev <dev@openvz.org>
    Cc: Andrey Savochkin <saw@sw.ru>
    Cc: Eric W. Biederman <ebiederm@xmission.com>
    Cc: Herbert Poetzl <herbert@13thfloor.at>
    Cc: Sam Vilain <sam.vilain@catalyst.net.nz>
    Cc: Serge E. Hallyn <serue@us.ibm.com>
    Cc: Dave Hansen <haveblue@us.ibm.com>

    ---
    arch/x86_64/kernel/entry.S | 30 ++++++++++++++++++++++++++++++
    arch/x86_64/kernel/functionlist | 3 +++
    arch/x86_64/kernel/process.c | 25 +++++++++++++++++++++++++
    include/asm-x86_64/unistd.h | 4 +++-
    4 files changed, 61 insertions(+), 1 deletion(-)

    Index: 2.6.18-rc1-mm1/arch/x86_64/kernel/entry.S
    ===================================================================
    --- 2.6.18-rc1-mm1.orig/arch/x86_64/kernel/entry.S
    +++ 2.6.18-rc1-mm1/arch/x86_64/kernel/entry.S
    @@ -453,6 +453,21 @@ ENTRY(stub_execve)
    CFI_ENDPROC
    END(stub_execve)

    +ENTRY(stub_execns)
    + CFI_STARTPROC
    + popq %r11
    + CFI_ADJUST_CFA_OFFSET -8
    + CFI_REGISTER rip, r11
    + SAVE_REST
    + FIXUP_TOP_OF_STACK %r11
    + call sys_execns
    + RESTORE_TOP_OF_STACK %r11
    + movq %rax,RAX(%rsp)
    + RESTORE_REST
    + jmp int_ret_from_sys_call
    + CFI_ENDPROC
    +END(stub_execns)
    +
    /*
    * sigreturn is special because it needs to restore all registers on return.
    * This cannot be done with SYSRET, so use the IRET return path instead.
    @@ -1014,6 +1029,21 @@ ENTRY(execve)
    CFI_ENDPROC
    ENDPROC(execve)

    +ENTRY(execns)
    + CFI_STARTPROC
    + FAKE_STACK_FRAME $0
    + SAVE_ALL
    + call sys_execns
    + movq %rax, RAX(%rsp)
    + RESTORE_REST
    + testq %rax,%rax
    + je int_ret_from_sys_call
    + RESTORE_ARGS
    + UNFAKE_STACK_FRAME
    + ret
    + CFI_ENDPROC
    +ENDPROC(execns)
    +
    KPROBE_ENTRY(page_fault)
    errorentry do_page_fault
    END(page_fault)
    Index: 2.6.18-rc1-mm1/arch/x86_64/kernel/functionlist
    ===================================================================
    --- 2.6.18-rc1-mm1.orig/arch/x86_64/kernel/functionlist
    +++ 2.6.18-rc1-mm1/arch/x86_64/kernel/functionlist
    @@ -551,6 +551,7 @@
    *(.text.sys_getdents)
    *(.text.sys_dup)
    *(.text.stub_execve)
    +*(.text.stub_execns)
    *(.text.sha_transform)
    *(.text.radix_tree_tag_clear)
    *(.text.put_unused_fd)
    @@ -678,6 +679,7 @@
    *(.text.__find_symbol)
    *(.text.do_futex)
    *(.text.do_execve)
    +*(.text.do_execns)
    *(.text.dirty_writeback_centisecs_handler)
    *(.text.dev_watchdog)
    *(.text.can_share_swap_page)
    @@ -1098,6 +1100,7 @@
    *(.text.sys_fstat)
    *(.text.sysfs_readdir)
    *(.text.sys_execve)
    +*(.text.sys_execns)
    *(.text.sysenter_tracesys)
    *(.text.sys_chown)
    *(.text.stub_clone)
    Index: 2.6.18-rc1-mm1/arch/x86_64/kernel/process.c
    ===================================================================
    --- 2.6.18-rc1-mm1.orig/arch/x86_64/kernel/process.c
    +++ 2.6.18-rc1-mm1/arch/x86_64/kernel/process.c
    @@ -697,6 +697,31 @@ long sys_execve(char __user *name, char
    return error;
    }

    +/*
    + * sys_execns() executes a new program and unshares selected
    + * namespaces.
    + */
    +asmlinkage
    +long sys_execns(int flags, char __user *name, char __user * __user *argv,
    + char __user * __user *envp, struct pt_regs regs)
    +{
    + long error;
    + char * filename;
    +
    + filename = getname(name);
    + error = PTR_ERR(filename);
    + if (IS_ERR(filename))
    + return error;
    + error = do_execns(flags, filename, argv, envp, &regs);
    + if (error == 0) {
    + task_lock(current);
    + current->ptrace &= ~PT_DTRACE;
    + task_unlock(current);
    + }
    + putname(filename);
    + return error;
    +}
    +
    void set_personality_64bit(void)
    {
    /* inherit personality from parent */
    Index: 2.6.18-rc1-mm1/include/asm-x86_64/unistd.h
    ===================================================================
    --- 2.6.18-rc1-mm1.orig/include/asm-x86_64/unistd.h
    +++ 2.6.18-rc1-mm1/include/asm-x86_64/unistd.h
    @@ -619,10 +619,12 @@ __SYSCALL(__NR_sync_file_range, sys_sync
    __SYSCALL(__NR_vmsplice, sys_vmsplice)
    #define __NR_move_pages 279
    __SYSCALL(__NR_move_pages, sys_move_pages)
    +#define __NR_execns 280
    +__SYSCALL(__NR_execns, stub_execns)

    #ifdef __KERNEL__

    -#define __NR_syscall_max __NR_move_pages
    +#define __NR_syscall_max __NR_execns
    #include <linux/err.h>

    #ifndef __NO_STUBS
    --
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2006-07-11 09:59    [W:0.029 / U:63.584 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site