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Arjun Shankar 9c443ac455 socket: Check lengths before advancing pointer in CMSG_NXTHDR 
The inline and library functions that the CMSG_NXTHDR macro may expand
to increment the pointer to the header before checking the stride of
the increment against available space.  Since C only allows incrementing
pointers to one past the end of an array, the increment must be done
after a length check.  This commit fixes that and includes a regression
test for CMSG_FIRSTHDR and CMSG_NXTHDR.

The Linux, Hurd, and generic headers are all changed.

Tested on Linux on armv7hl, i686, x86_64, aarch64, ppc64le, and s390x.

[BZ #28846]

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
2022-08-02 11:10:25 +02:00
..
types Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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elfclass.h Update. 1999-07-27 05:53:25 +00:00
endian.h Update. 1997-11-26 04:23:08 +00:00
environments.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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ioctls.h Update. 1997-11-26 04:23:08 +00:00
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libm-simd-decl-stubs.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
link_lavcurrent.h elf: Issue la_symbind for bind-now (BZ #23734) 2022-02-01 14:49:46 -03:00
link.h * csu/elf-init.c (__libc_csu_fini): Don't do anything here. 2005-01-06 22:40:27 +00:00
local_lim.h Update. 1997-10-15 05:34:02 +00:00
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mman_ext.h linux: Add process_madvise 2022-06-02 15:43:28 -03:00
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posix_opt.h Update. 1997-10-15 05:34:02 +00:00
pthreadtypes.h 2002-11-10 Roland McGrath <roland@redhat.com> 2002-11-10 23:22:35 +00:00
resource.h Update copyright dates with scripts/update-copyrights 2022-01-01 11:40:24 -08:00
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setjmp.h Update. 1997-11-26 04:23:08 +00:00
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socket.h socket: Check lengths before advancing pointer in CMSG_NXTHDR 2022-08-02 11:10:25 +02:00
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wordsize.h Define wordsize.h macros everywhere 2016-11-04 09:37:44 -07:00