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authorChristophe Leroy <christophe.leroy@c-s.fr>2018-11-07 20:14:10 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-04-20 09:17:03 +0200
commit8167ea40725deb8617d66a3f63c08c9d924a6b04 (patch)
treed23542f4418582867e428b7a3f0e36cf4d30e754
parent8bc6ef890c869099514bdaf72354f84c8517b7c2 (diff)
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lkdtm: Print real addresses
[ Upstream commit 4c411157a42f122051ae3469bee0b5cabe89e139 ] Today, when doing a lkdtm test before the readiness of the random generator, (ptrval) is printed instead of the address at which it perform the fault: [ 1597.337030] lkdtm: Performing direct entry EXEC_USERSPACE [ 1597.337142] lkdtm: attempting ok execution at (ptrval) [ 1597.337398] lkdtm: attempting bad execution at (ptrval) [ 1597.337460] kernel tried to execute user page (77858000) -exploit attempt? (uid: 0) [ 1597.344769] Unable to handle kernel paging request for instruction fetch [ 1597.351392] Faulting instruction address: 0x77858000 [ 1597.356312] Oops: Kernel access of bad area, sig: 11 [#1] If the lkdtm test is done later on, it prints an hashed address. In both cases this is pointless. The purpose of the test is to ensure the kernel generates an Oops at the expected address, so real addresses needs to be printed. This patch fixes that. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r--drivers/misc/lkdtm/perms.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/misc/lkdtm/perms.c b/drivers/misc/lkdtm/perms.c
index 53b85c9d16b8..fa54add6375a 100644
--- a/drivers/misc/lkdtm/perms.c
+++ b/drivers/misc/lkdtm/perms.c
@@ -47,7 +47,7 @@ static noinline void execute_location(void *dst, bool write)
{
void (*func)(void) = dst;
- pr_info("attempting ok execution at %p\n", do_nothing);
+ pr_info("attempting ok execution at %px\n", do_nothing);
do_nothing();
if (write == CODE_WRITE) {
@@ -55,7 +55,7 @@ static noinline void execute_location(void *dst, bool write)
flush_icache_range((unsigned long)dst,
(unsigned long)dst + EXEC_SIZE);
}
- pr_info("attempting bad execution at %p\n", func);
+ pr_info("attempting bad execution at %px\n", func);
func();
}
@@ -66,14 +66,14 @@ static void execute_user_location(void *dst)
/* Intentionally crossing kernel/user memory boundary. */
void (*func)(void) = dst;
- pr_info("attempting ok execution at %p\n", do_nothing);
+ pr_info("attempting ok execution at %px\n", do_nothing);
do_nothing();
copied = access_process_vm(current, (unsigned long)dst, do_nothing,
EXEC_SIZE, FOLL_WRITE);
if (copied < EXEC_SIZE)
return;
- pr_info("attempting bad execution at %p\n", func);
+ pr_info("attempting bad execution at %px\n", func);
func();
}
@@ -82,7 +82,7 @@ void lkdtm_WRITE_RO(void)
/* Explicitly cast away "const" for the test. */
unsigned long *ptr = (unsigned long *)&rodata;
- pr_info("attempting bad rodata write at %p\n", ptr);
+ pr_info("attempting bad rodata write at %px\n", ptr);
*ptr ^= 0xabcd1234;
}
@@ -100,7 +100,7 @@ void lkdtm_WRITE_RO_AFTER_INIT(void)
return;
}
- pr_info("attempting bad ro_after_init write at %p\n", ptr);
+ pr_info("attempting bad ro_after_init write at %px\n", ptr);
*ptr ^= 0xabcd1234;
}
@@ -112,7 +112,7 @@ void lkdtm_WRITE_KERN(void)
size = (unsigned long)do_overwritten - (unsigned long)do_nothing;
ptr = (unsigned char *)do_overwritten;
- pr_info("attempting bad %zu byte write at %p\n", size, ptr);
+ pr_info("attempting bad %zu byte write at %px\n", size, ptr);
memcpy(ptr, (unsigned char *)do_nothing, size);
flush_icache_range((unsigned long)ptr, (unsigned long)(ptr + size));
@@ -185,11 +185,11 @@ void lkdtm_ACCESS_USERSPACE(void)
ptr = (unsigned long *)user_addr;
- pr_info("attempting bad read at %p\n", ptr);
+ pr_info("attempting bad read at %px\n", ptr);
tmp = *ptr;
tmp += 0xc0dec0de;
- pr_info("attempting bad write at %p\n", ptr);
+ pr_info("attempting bad write at %px\n", ptr);
*ptr = tmp;
vm_munmap(user_addr, PAGE_SIZE);