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unw_is_signal_frame should return false/0 for bad addresses

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access_mem() could fail and return a non-zero value, which callers
interpret as boolean true.

Signed-off-by: Dave Lerner <dave.lerner@windriver.com>
This commit is contained in:
dave lerner 2013-03-07 12:25:19 -06:00 committed by Arun Sharma
parent 679b65cd22
commit 8028a537dd
1 changed files with 5 additions and 4 deletions
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7
src/x86/Gos-linux.c
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@ -57,9 +57,10 @@ unw_is_signal_frame (unw_cursor_t *cursor)
if SA_SIGINFO is specified. if SA_SIGINFO is specified.
*/ */
ip = c->dwarf.ip; ip = c->dwarf.ip;
if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0 if ((*a->access_mem) (as, ip, &w0, 0, arg) < 0
|| (ret = (*a->access_mem) (as, ip + 4, &w1, 0, arg)) < 0) || (*a->access_mem) (as, ip + 4, &w1, 0, arg) < 0)
return ret; ret = 0;
else
ret = ((w0 == 0x0077b858 && w1 == 0x80cd0000) ret = ((w0 == 0x0077b858 && w1 == 0x80cd0000)
|| (w0 == 0x0000adb8 && (w1 & 0xffffff) == 0x80cd00)); || (w0 == 0x0000adb8 && (w1 & 0xffffff) == 0x80cd00));
Debug (16, "returning %d\n", ret); Debug (16, "returning %d\n", ret);