26d8253ac6
members of the ELF Executable Header inside the library-private
`struct _Elf' descriptor and only update the underlying Elf{32,64}_Ehdr
structure on an elf_update(3) call. These fields of the Ehdr
structure are technically `out of bounds' for an application program
per the ELF(3) API, but we've seen applications that initialize
a new Ehdr structure using memcpy(), messing up the library's
invariants. [1]
Implement elf_getphnum() and handle ELF objects with more than
64K program header table entries.
Reported by: jb [1]
88 lines
2.6 KiB
Groff
88 lines
2.6 KiB
Groff
.\" Copyright (c) 2006 Joseph Koshy. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" This software is provided by Joseph Koshy ``as is'' and
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.\" any express or implied warranties, including, but not limited to, the
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.\" implied warranties of merchantability and fitness for a particular purpose
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.\" are disclaimed. in no event shall Joseph Koshy be liable
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.\" for any direct, indirect, incidental, special, exemplary, or consequential
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.\" damages (including, but not limited to, procurement of substitute goods
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.\" or services; loss of use, data, or profits; or business interruption)
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.\" however caused and on any theory of liability, whether in contract, strict
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.\" liability, or tort (including negligence or otherwise) arising in any way
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.\" out of the use of this software, even if advised of the possibility of
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.\" such damage.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd December 16, 2006
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.Os
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.Dt ELF_GETPHNUM 3
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.Sh NAME
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.Nm elf_getphnum
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.Nd return the number of program headers in an ELF file
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.Sh LIBRARY
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.Lb libelf
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.Sh SYNOPSIS
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.In libelf.h
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.Ft int
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.Fn elf_getphnum "Elf *elf" "size_t *phnum"
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.Sh DESCRIPTION
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Function
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.Fn elf_getphnum
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retrieves the number of ELF program headers associated with descriptor
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.Ar elf
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and stores it into the location pointed to by argument
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.Ar phnum .
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.Pp
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This routine allows applications to uniformly process both normal ELF
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objects and ELF objects that use extended numbering.
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.Pp
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.Sh RETURN VALUES
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Function
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.Fn elf_getphnum
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returns a non-zero value if successful, or zero in case of an
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error.
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.Sh ERRORS
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Function
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.Fn elf_getphnum
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can fail with the following errors:
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.Bl -tag -width "[ELF_E_RESOURCE]"
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.It Bq Er ELF_E_ARGUMENT
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A NULL value was passed in for argument
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.Ar elf .
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar elf
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was not for an ELF file.
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.It Bq Er ELF_E_ARGUMENT
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Argument
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.Ar elf
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lacks an ELF Executable Header.
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.It Bq Er ELF_E_HEADER
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The ELF Executable Header associated with argument
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.Ar elf
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was corrupt.
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.It Bq Er ELF_E_SECTION
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The section header at index
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.Dv SHN_UNDEF
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was corrupt.
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.El
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.Sh SEE ALSO
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.Xr elf 3 ,
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.Xr elf32_getehdr 3 ,
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.Xr elf64_getehdr 3 ,
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.Xr elf_getident 3 ,
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.Xr elf_getshnum 3 ,
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.Xr elf_getshstrndx 3 ,
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.Xr gelf 3 ,
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.Xr gelf_getehdr 3
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