Red Hat Bugzilla – Bug 177121
libm.so built with writable text segment
Last modified: 2007-11-30 17:11:20 EST
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050922 Fedora/1.0.7-1.1.fc4 Firefox/1.0.7 Description of problem: Gawk has suddenly started causing avc messages. They are regarding execmem ( background info is here: http://people.redhat.com/drepper/selinux-mem.html ). This is the avc message: type=SYSCALL msg=audit(01/06/2006 09:23:07.788:36) : arch=x86_64 syscall=mmap success=yes exit=-1429430272(Unknown error 1429430272) a0=0 a1=1810b8 a2=7 a3=802 items=0 pid=1912 auid=unknown(4294967295) uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) comm=awk exe=/bin/gawk subj=system_u:system_r:initrc_t:s0 type=AVC msg=audit(01/06/2006 09:23:07.788:36) : avc: granted { execmem } for pid=1912 comm=awk scontext=system_u:system_r:initrc_t:s0 tcontext=system_u:system_r:initrc_t:s0 tclass=process Version-Release number of selected component (if applicable): gawk-3.1.5-5 How reproducible: Always Steps to Reproduce: 1. You can simply do "ausearch -m avc -x gawk -i | less" and you should see them on a rawhide machine. Init scripts runs gawk so you don't need any special setup to generate these. Additional info:
I ran "./gawk" while tailing /var/log/audit/audit.log and see the avc violation. I ran strace and found the following: open("/lib64/libm.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300<\0\0"..., 832) = 832fstat(3, {st_mode=S_IFREG|0755, st_size=608488, ...}) = 0 mmap(NULL, 1577144, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x2aaaaacca000 mprotect(0x2aaaaad4b000, 1044480, PROT_NONE) = 0 mmap(0x2aaaaae4a000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x80000) = 0x2aaaaae4a000 close(3) = 0 This may be coming from the dynamic linker. Ulrich?
libm is built with RWE text segment on ppc64. Maybe a glibc bug or a tools bug.
Today's glibc build fixes the bug.