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Red Hat Enterprise Linux 6 Essentials eBook now available in PDF and ePub formats for only $9.99
RHEL 6 Essentials contains 40 chapters and over 250 pages.

Chapter 18. String and data retrieving functions Tapset

function::kernel_string — Retrieves string from kernel memory.
function::kernel_string2 — Retrieves string from kernel memory with alternative error string.
function::kernel_string_n — Retrieves string of given length from kernel memory.
function::kernel_long — Retrieves a long value stored in kernel memory.
function::kernel_int — Retrieves an int value stored in kernel memory.
function::kernel_short — Retrieves a short value stored in kernel memory.
function::kernel_char — Retrieves a char value stored in kernel memory.
function::kernel_pointer — Retrieves a pointer value stored in kernel memory.
function::user_string — Retrieves string from user space.
function::user_string2 — Retrieves string from user space with alternative error string.
function::user_string_warn — Retrieves string from user space.
function::user_string_quoted — Retrieves and quotes string from user space.
function::user_string_n — Retrieves string of given length from user space.
function::user_string_n2 — Retrieves string of given length from user space.
function::user_string_n_warn — Retrieves string from user space.
function::user_string_n_quoted — Retrieves and quotes string from user space.
function::user_short — Retrieves a short value stored in user space.
function::user_short_warn — Retrieves a short value stored in user space.
function::user_int — Retrieves an int value stored in user space.
function::user_int_warn — Retrieves an int value stored in user space.
function::user_long — Retrieves a long value stored in user space.
function::user_long_warn — Retrieves a long value stored in user space.
function::user_char — Retrieves a char value stored in user space.
function::user_char_warn — Retrieves a char value stored in user space.
Functions to retrieve strings and other primitive types from the kernel or a user space programs based on addresses. All strings are of a maximum length given by MAXSTRINGLEN.

Name

function::kernel_string — Retrieves string from kernel memory.

Synopsis

function kernel_string:string(addr:long)

Arguments

addr
The kernel address to retrieve the string from.

General Syntax

kernel_string:string(addr:long)

Description

This function returns the null terminated C string from a given kernel memory address. Reports an error on string copy fault.

Name

function::kernel_string2 — Retrieves string from kernel memory with alternative error string.

Synopsis

function kernel_string2:string(addr:long,err_msg:string)

Arguments

addr
The kernel address to retrieve the string from.
err_msg
The error message to return when data isn't available.

General Syntax

kernel_string2:string(addr:long, err_msg:string)

Description

This function returns the null terminated C string from a given kernel memory address. Reports the given error message on string copy fault.

Name

function::kernel_string_n — Retrieves string of given length from kernel memory.

Synopsis

function kernel_string_n:string(addr:long,n:long)

Arguments

addr
The kernel address to retrieve the string from.
n
The maximum length of the string (if not null terminated).

General Syntax

kernel_string_n:string(addr:long, n:long)

Description

Returns the C string of a maximum given length from a given kernel memory address. Reports an error on string copy fault.

Name

function::kernel_long — Retrieves a long value stored in kernel memory.

Synopsis

function kernel_long:long(addr:long)

Arguments

addr
The kernel address to retrieve the long from.

General Syntax

kernel_long:long(addr:long)

Description

Returns the long value from a given kernel memory address. Reports an error when reading from the given address fails.

Name

function::kernel_int — Retrieves an int value stored in kernel memory.

Synopsis

function kernel_int:long(addr:long)

Arguments

addr
The kernel address to retrieve the int from.

Description

Returns the int value from a given kernel memory address. Reports an error when reading from the given address fails.

Name

function::kernel_short — Retrieves a short value stored in kernel memory.

Synopsis

function kernel_short:long(addr:long)

Arguments

addr
The kernel address to retrieve the short from.

General Syntax

kernel_short:long(addr:long)

Description

Returns the short value from a given kernel memory address. Reports an error when reading from the given address fails.

Name

function::kernel_char — Retrieves a char value stored in kernel memory.

Synopsis

function kernel_char:long(addr:long)

Arguments

addr
The kernel address to retrieve the char from.

General Syntax

kernel_char:long(addr:long)

Description

Returns the char value from a given kernel memory address. Reports an error when reading from the given address fails.

Name

function::kernel_pointer — Retrieves a pointer value stored in kernel memory.

Synopsis

function kernel_pointer:long(addr:long)

Arguments

addr
The kernel address to retrieve the pointer from.

General Syntax

kernel_pointer:long(addr:long)

Description

Returns the pointer value from a given kernel memory address. Reports an error when reading from the given address fails.

Name

function::user_string — Retrieves string from user space.

Synopsis

function user_string:string(addr:long)

Arguments

addr
The user space address to retrieve the string from.

General Syntax

user_string:string(addr:long)

Description

Returns the null terminated C string from a given user space memory address. Reports <unknown> on the rare cases when userspace data is not accessible.

Name

function::user_string2 — Retrieves string from user space with alternative error string.

Synopsis

function user_string2:string(addr:long,err_msg:string)

Arguments

addr
The user space address to retrieve the string from.
err_msg
The error message to return when data isn't available.

General Syntax

user_string2:string(addr:long, err_msg:string)

Description

Returns the null terminated C string from a given user space memory address. Reports the given error message on the rare cases when userspace data is not accessible.

Name

function::user_string_warn — Retrieves string from user space.

Synopsis

function user_string_warn:string(addr:long)

Arguments

addr
The user space address to retrieve the string from.

General Syntax

user_string_warn:string(addr:long)

Description

Returns the null terminated C string from a given user space memory address. Reports <unknown> on the rare cases when userspace data is not accessible and warns (but does not abort) about the failure.

Name

function::user_string_quoted — Retrieves and quotes string from user space.

Synopsis

function user_string_quoted:string(addr:long)

Arguments

addr
The user space address to retrieve the string from.

General Syntax

user_string_quoted:string(addr:long)

Description

Returns the null terminated C string from a given user space memory address where any ASCII characters that are not printable are replaced by the corresponding escape sequence in the returned string. Reports NULL for address zero. Returns <unknown> on the rare cases when userspace data is not accessible at the given address.

Name

function::user_string_n — Retrieves string of given length from user space.

Synopsis

function user_string_n:string(addr:long,n:long)

Arguments

addr
The user space address to retrieve the string from.
n
The maximum length of the string (if not null terminated).

General Syntax

user_string_n:string(addr:long, n:long)

Description

Returns the C string of a maximum given length from a given user space address. Returns <unknown> on the rare cases when userspace data is not accessible at the given address.

Name

function::user_string_n2 — Retrieves string of given length from user space.

Synopsis

function user_string_n2:string(addr:long,n:long,err_msg:string)

Arguments

addr
The user space address to retrieve the string from.
n
The maximum length of the string (if not null terminated).
err_msg
The error message to return when data isn't available.

General Syntax

user_string_n2:string(addr:long, n:long, err_msg:string)

Description

Returns the C string of a maximum given length from a given user space address. Returns the given error message string on the rare cases when userspace data is not accessible at the given address.

Name

function::user_string_n_warn — Retrieves string from user space.

Synopsis

function user_string_n_warn:string(addr:long,n:long)

Arguments

addr
The user space address to retrieve the string from.
n
The maximum length of the string (if not null terminated).

General Syntax

user_string_n_warn:string(addr:long, n:long)

Description

Returns up to n characters of a C string from a given user space memory address. Reports <unknown> on the rare cases when userspace data is not accessible and warns (but does not abort) about the failure.

Name

function::user_string_n_quoted — Retrieves and quotes string from user space.

Synopsis

function user_string_n_quoted:string(addr:long,n:long)

Arguments

addr
The user space address to retrieve the string from.
n
The maximum length of the string (if not null terminated).

General Syntax

user_string_n_quoted:string(addr:long, n:long)

Description

Returns up to n characters of a C string from the given user space memory address where any ASCII characters that are not printable are replaced by the corresponding escape sequence in the returned string. Reports NULL for address zero. Returns <unknown> on the rare cases when userspace data is not accessible at the given address.

Name

function::user_short — Retrieves a short value stored in user space.

Synopsis

function user_short:long(addr:long)

Arguments

addr
The user space address to retrieve the short from.

General Syntax

user_short:long(addr:long)

Description

Returns the short value from a given user space address. Returns zero when user space data is not accessible.

Name

function::user_short_warn — Retrieves a short value stored in user space.

Synopsis

function user_short_warn:long(addr:long)

Arguments

addr
The user space address to retrieve the short from.

General Syntax

user_short_warn:long(addr:long)

Description

Returns the short value from a given user space address. Returns zero when user space and warns (but does not abort) about the failure.

Name

function::user_int — Retrieves an int value stored in user space.

Synopsis

function user_int:long(addr:long)

Arguments

addr
The user space address to retrieve the int from.

General Syntax

user_int:long(addr:long)

Description

Returns the int value from a given user space address. Returns zero when user space data is not accessible.

Name

function::user_int_warn — Retrieves an int value stored in user space.

Synopsis

function user_int_warn:long(addr:long)

Arguments

addr
The user space address to retrieve the int from.

General Syntax

user_ing_warn:long(addr:long)

Description

Returns the int value from a given user space address. Returns zero when user space and warns (but does not abort) about the failure.

Name

function::user_long — Retrieves a long value stored in user space.

Synopsis

function user_long:long(addr:long)

Arguments

addr
The user space address to retrieve the long from.

General Syntax

user_long:long(addr:long)

Description

Returns the long value from a given user space address. Returns zero when user space data is not accessible. Note that the size of the long depends on the architecture of the current user space task (for those architectures that support both 64/32 bit compat tasks).

Name

function::user_long_warn — Retrieves a long value stored in user space.

Synopsis

function user_long_warn:long(addr:long)

Arguments

addr
The user space address to retrieve the long from.

General Syntax

user_long_warn:long(addr:long)

Description

Returns the long value from a given user space address. Returns zero when user space and warns (but does not abort) about the failure. Note that the size of the long depends on the architecture of the current user space task (for those architectures that support both 64/32 bit compat tasks).

Name

function::user_char — Retrieves a char value stored in user space.

Synopsis

function user_char:long(addr:long)

Arguments

addr
The user space address to retrieve the char from.

General Syntax

user_char:long(addr:long)

Description

Returns the char value from a given user space address. Returns zero when user space data is not accessible.

Name

function::user_char_warn — Retrieves a char value stored in user space.

Synopsis

function user_char_warn:long(addr:long)

Arguments

addr
The user space address to retrieve the char from.

General Syntax

user_char_warn:long(addr:long)

Description

Returns the char value from a given user space address. Returns zero when user space and warns (but does not abort) about the failure.

 
 
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