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authorAndy Honig <ahonig@google.com>2014-03-03 15:38:30 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-03-04 07:55:48 -0800
commit0f55159d091cb1e555ee52abc1b2455f301b99a8 (patch)
tree974dda7fad3a23157737ce052e658d1efdc9ccd5 /scripts
parent5ec384d45b42fc9274df835be435e964f885b6ed (diff)
downloadlinux-0f55159d091cb1e555ee52abc1b2455f301b99a8.tar.gz
kallsyms: fix absolute addresses for kASLR
Currently symbols that are absolute addresses are incorrectly displayed in /proc/kallsyms if the kernel is loaded with kASLR. The problem was that the scripts/kallsyms.c file which generates the array of symbol names and addresses uses an relocatable value for all symbols, even absolute symbols. This patch fixes that. Several kallsyms output in different boot states for comparison: $ egrep '_(stext|_per_cpu_(start|end))' /root/kallsyms.nokaslr 0000000000000000 D __per_cpu_start 0000000000014280 D __per_cpu_end ffffffff810001c8 T _stext $ egrep '_(stext|_per_cpu_(start|end))' /root/kallsyms.kaslr1 000000001f200000 D __per_cpu_start 000000001f214280 D __per_cpu_end ffffffffa02001c8 T _stext $ egrep '_(stext|_per_cpu_(start|end))' /root/kallsyms.kaslr2 000000000d400000 D __per_cpu_start 000000000d414280 D __per_cpu_end ffffffff8e4001c8 T _stext $ egrep '_(stext|_per_cpu_(start|end))' /root/kallsyms.kaslr-fixed 0000000000000000 D __per_cpu_start 0000000000014280 D __per_cpu_end ffffffffadc001c8 T _stext Signed-off-by: Andy Honig <ahonig@google.com> Signed-off-by: Kees Cook <keescook@chromium.org> Cc: Michal Marek <mmarek@suse.cz> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/kallsyms.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 10085de886f..276e84b8a8e 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -330,8 +330,7 @@ static void write_src(void)
printf("\tPTR\t_text + %#llx\n",
table[i].addr - _text);
else
- printf("\tPTR\t_text - %#llx\n",
- _text - table[i].addr);
+ printf("\tPTR\t%#llx\n", table[i].addr);
} else {
printf("\tPTR\t%#llx\n", table[i].addr);
}