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Detect 0==DT_SYMTAB in invert_pt_dynamic()

Browse Source 
https://github.com/upx/upx/issues/333
	modified:   p_lx_elf.cpp
This commit is contained in:
John Reiser 2020-01-14 18:45:52 -08:00
parent 1bb93d4fce
commit e2f60adc95
1 changed files with 8 additions and 8 deletions
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16
src/p_lx_elf.cpp
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@ -1639,8 +1639,8 @@ PackLinuxElf32::invert_pt_dynamic(Elf32_Dyn const *dynp)
unsigned const *const buckets = &hashtab[2];
unsigned const *const chains = &buckets[nbucket]; (void)chains;
unsigned const v_sym = get_te32(&dynp0[-1+ x_sym].d_val);
if (!nbucket
unsigned const v_sym = !x_sym ? 0 : get_te32(&dynp0[-1+ x_sym].d_val);
if (!nbucket || !v_sym
|| (nbucket>>31) || (file_size/sizeof(unsigned)) <= (2*nbucket) // FIXME: weak
|| ((v_hsh < v_sym) && (v_sym - v_hsh) < (sizeof(unsigned)*2 // headers
+ sizeof(*buckets)*nbucket // buckets
@ -1670,8 +1670,8 @@ PackLinuxElf32::invert_pt_dynamic(Elf32_Dyn const *dynp)
unsigned const *const hasharr = &buckets[n_bucket]; (void)hasharr;
//unsigned const *const gashend = &hasharr[n_bucket]; // minimum
unsigned const v_sym = get_te32(&dynp0[-1+ x_sym].d_val);
if (!n_bucket || !n_bitmask
unsigned const v_sym = !x_sym ? 0 : get_te32(&dynp0[-1+ x_sym].d_val);
if (!n_bucket || !n_bitmask || !v_sym
|| (-1+ n_bitmask) & n_bitmask // not a power of 2
|| 8*sizeof(unsigned) <= gnu_shift // shifted result always == 0
|| (n_bucket>>30) // fie on fuzzers
@ -5139,8 +5139,8 @@ PackLinuxElf64::invert_pt_dynamic(Elf64_Dyn const *dynp)
unsigned const *const buckets = &hashtab[2];
unsigned const *const chains = &buckets[nbucket]; (void)chains;
unsigned const v_sym = get_te32(&dynp0[-1+ x_sym].d_val);
if (!nbucket
unsigned const v_sym = !x_sym ? 0 : get_te32(&dynp0[-1+ x_sym].d_val);
if (!nbucket || !v_sym
|| (nbucket>>31) || (file_size/sizeof(unsigned)) <= (2*nbucket) // FIXME: weak
|| ((v_hsh < v_sym) && (v_sym - v_hsh) < (sizeof(unsigned)*2 // headers
+ sizeof(*buckets)*nbucket // buckets
@ -5170,8 +5170,8 @@ PackLinuxElf64::invert_pt_dynamic(Elf64_Dyn const *dynp)
unsigned const *const hasharr = &buckets[n_bucket]; (void)hasharr;
//unsigned const *const gashend = &hasharr[n_bucket]; // minimum
upx_uint64_t const v_sym = get_te64(&dynp0[-1+ x_sym].d_val);
if (!n_bucket || !n_bitmask
upx_uint64_t const v_sym = !x_sym ? 0 : get_te64(&dynp0[-1+ x_sym].d_val);
if (!n_bucket || !n_bitmask || !v_sym
|| (-1+ n_bitmask) & n_bitmask // not a power of 2
|| 8*sizeof(upx_uint64_t) <= gnu_shift // shifted result always == 0
|| (n_bucket>>30) // fie on fuzzers