Revert "Debuggerd now outputs the offset of libc.so on the device as a separate item."
This reverts commit c031a3b006129ca408eaade325a53a334daee3b2.
Conflicts:
debuggerd/debuggerd.c
Change-Id: Ib37ae793bbffdb4a81837bc51171cc62b12abe7d
diff --git a/debuggerd/debuggerd.c b/debuggerd/debuggerd.c
index 7a3e781..685f147 100644
--- a/debuggerd/debuggerd.c
+++ b/debuggerd/debuggerd.c
@@ -37,7 +37,6 @@
#include <private/android_filesystem_config.h>
-#include <byteswap.h>
#include "debuggerd.h"
#include "utility.h"
@@ -196,73 +195,6 @@
if(sig) dump_fault_addr(tfd, tid, sig);
}
-/* After randomization (ASLR), stack contents that point to randomized
- * code become uninterpretable (e.g. can't be resolved to line numbers).
- * Here, we bundle enough information so that stack analysis on the
- * server side can still be performed. This means we are leaking some
- * information about the device (its randomization base). We have to make
- * sure an attacker has no way of intercepting the tombstone.
- */
-
-typedef struct {
- int32_t mmap_addr;
- char tag[4]; /* 'P', 'R', 'E', ' ' */
-} prelink_info_t __attribute__((packed));
-
-static inline void set_prelink(long *prelink_addr,
- prelink_info_t *info)
-{
- // We will assume the binary is little-endian, and test the
- // host endianness here.
- unsigned long test_endianness = 0xFF;
-
- if (sizeof(prelink_info_t) == 8 && prelink_addr) {
- if (*(unsigned char *)&test_endianness)
- *prelink_addr = info->mmap_addr;
- else
- *prelink_addr = bswap_32(info->mmap_addr);
- }
-}
-
-static int check_prelinked(const char *fname,
- long *prelink_addr)
-{
- *prelink_addr = 0;
- if (sizeof(prelink_info_t) != 8) return 0;
-
- int fd = open(fname, O_RDONLY);
- if (fd < 0) return 0;
- off_t end = lseek(fd, 0, SEEK_END);
- int nr = sizeof(prelink_info_t);
-
- off_t sz = lseek(fd, -nr, SEEK_CUR);
- if ((long)(end - sz) != (long)nr) return 0;
- if (sz == (off_t)-1) return 0;
-
- prelink_info_t info;
- int num_read = read(fd, &info, nr);
- if (num_read < 0) return 0;
- if (num_read != sizeof(info)) return 0;
-
- int prelinked = 0;
- if (!strncmp(info.tag, "PRE ", 4)) {
- set_prelink(prelink_addr, &info);
- prelinked = 1;
- }
- if (close(fd) < 0) return 0;
- return prelinked;
-}
-
-void dump_randomization_base(int tfd, bool at_fault) {
- bool only_in_tombstone = !at_fault;
- long prelink_addr;
- check_prelinked("/system/lib/libc.so", &prelink_addr);
- _LOG(tfd, only_in_tombstone,
- "\nlibc base address: %08x\n", prelink_addr);
-}
-
-/* End of ASLR-related logic. */
-
static void parse_elf_info(mapinfo *milist, pid_t pid)
{
mapinfo *mi;
@@ -353,7 +285,6 @@
dump_pc_and_lr(tfd, tid, milist, stack_depth, at_fault);
}
- dump_randomization_base(tfd, at_fault);
dump_stack_and_code(tfd, tid, milist, stack_depth, sp_list, at_fault);
#elif __i386__
/* If stack unwinder fails, use the default solution to dump the stack