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libsepol: validate categories

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Check all categories have valid values, especially important for
aliases.

        ==7888==ERROR: AddressSanitizer: SEGV on unknown address 0x602000400710 (pc 0x00000055debc bp 0x7ffe0ff2a9d0 sp 0x7ffe0ff2a8e0 T0)
        ==7888==The signal is caused by a READ memory access.
        #0 0x55debc in write_category_rules_to_conf ./libsepol/src/kernel_to_conf.c:946:9
        #1 0x55debc in write_mls_rules_to_conf ./libsepol/src/kernel_to_conf.c:1137:7
        #2 0x55adb1 in sepol_kernel_policydb_to_conf ./libsepol/src/kernel_to_conf.c:3106:7
        #3 0x55a34f in LLVMFuzzerTestOneInput ./libsepol/fuzz/binpolicy-fuzzer.c:37:9
        #4 0x45aed3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) fuzzer.o
        #5 0x446a12 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) fuzzer.o
        #6 0x44c93b in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) fuzzer.o
        #7 0x475dd2 in main (./out/binpolicy-fuzzer+0x475dd2)
        #8 0x7fe80ccaf7ec in __libc_start_main csu/../csu/libc-start.c:332:16
        #9 0x423689 in _start (./out/binpolicy-fuzzer+0x423689)

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
This commit is contained in:
Christian Göttsche 2021-12-09 17:49:26 +01:00 committed by James Carter
parent 80b9441588
commit 8a7215c6a5
1 changed files with 11 additions and 8 deletions
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19
libsepol/src/policydb_validate.c
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@ -485,6 +485,14 @@ bad:
return -1;
}
static int validate_datum(__attribute__ ((unused))hashtab_key_t k, hashtab_datum_t d, void *args)
{
symtab_datum_t *s = d;
uint32_t *nprim = (uint32_t *)args;
return !value_isvalid(s->value, *nprim);
}
static int validate_datum_array_entries(sepol_handle_t *handle, policydb_t *p, validate_t flavors[])
{
map_arg_t margs = { flavors, handle, p->mls };
@ -507,6 +515,9 @@ static int validate_datum_array_entries(sepol_handle_t *handle, policydb_t *p, v
if (p->mls && hashtab_map(p->p_levels.table, validate_level_datum, flavors))
goto bad;
if (hashtab_map(p->p_cats.table, validate_datum, &flavors[SYM_CATS]))
goto bad;
return 0;
bad:
@ -905,14 +916,6 @@ bad:
return -1;
}
static int validate_datum(__attribute__ ((unused))hashtab_key_t k, hashtab_datum_t d, void *args)
{
symtab_datum_t *s = d;
uint32_t *nprim = (uint32_t *)args;
return !value_isvalid(s->value, *nprim);
}
static int validate_symtabs(sepol_handle_t *handle, symtab_t symtabs[], validate_t flavors[])
{
unsigned int i;