https://sourceware.org/bugzilla/show_bug.cgi?id=29614
Bug ID: 29614
Summary: Fails to build with GCC master + -D_FORTIFY_SOURCE=3
Product: elfutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: general
Assignee: unassigned at sourceware dot org
Reporter: mliska at suse dot cz
CC: elfutils-devel at sourceware dot org, mjw at fedoraproject
dot org
Target Milestone: ---
Fails due to:
[ 96s] In file included from /usr/include/ar.h:22,
[ 96s] from ../libelf/libelfP.h:33,
[ 96s] from core-file.c:31:
[ 96s] In function 'pread',
[ 96s] inlined from 'pread_retry' at ../lib/system.h:188:21,
[ 96s] inlined from 'elf_begin_rand' at core-file.c:86:16,
[ 96s] inlined from 'core_file_read_eagerly' at core-file.c:205:15:
[ 96s] /usr/include/bits/unistd.h:74:10: error: '*pread' writing 58 or more
bytes into a region of size 10 overflows the destination
[-Werror=stringop-overflow=]
[ 96s] 74 | return __glibc_fortify (pread, __nbytes, sizeof (char),
[ 96s] | ^~~~~~~~~~~~~~~
[ 96s] /usr/include/ar.h: In function 'core_file_read_eagerly':
[ 96s] /usr/include/ar.h:41:10: note: destination object 'ar_size' of size 10
[ 96s] 41 | char ar_size[10]; /* File size, in ASCII
decimal. */
[ 96s] | ^~~~~~~
[ 96s] /usr/include/bits/unistd.h:50:16: note: in a call to function '*pread'
declared with attribute 'access (write_only, 2, 3)'
[ 96s] 50 | extern ssize_t __REDIRECT (__pread_alias,
[ 96s] | ^~~~~~~~~~
[ 96s] cc1: all warnings being treated as errors
[ 96s] make[2]: *** [Makefile:711: core-file.o] Error 1
[ 96s] make[2]: *** Waiting for unfinished jobs....
which is likely a false positive of the warning. Note the warning is quite
known for its false positives.
Can you please take a look?
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