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| author |   Christophe Leroy <christophe.leroy@c-s.fr> | 2019-12-23 07:54:22 +0000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2020-01-27 22:37:24 +1100 |
| commit | 0f9aee0cb9da7db7d96f63cfa2dc5e4f1bffeb87 (patch) | |
| tree | d2bf7e25c2e75881f18c138e68436a02119d9946 /arch/powerpc/mm | |
| parent | powerpc/32s: Enable CONFIG_VMAP_STACK (diff) | |
| download | linux-dev-0f9aee0cb9da7db7d96f63cfa2dc5e4f1bffeb87.tar.xz linux-dev-0f9aee0cb9da7db7d96f63cfa2dc5e4f1bffeb87.zip | |
powerpc/mm: Don't log user reads to 0xffffffff
Running vdsotest leaves many times the following log:
[ 79.629901] vdsotest[396]: User access of kernel address (ffffffff) - exploit attempt? (uid: 0)
A pointer set to (-1) is likely a programming error similar to
a NULL pointer and is not worth logging as an exploit attempt.
Don't log user accesses to 0xffffffff.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/0728849e826ba16f1fbd6fa7f5c6cc87bd64e097.1577087627.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/fault.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index 9e119f98a725..7534ee5bf9b2 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -350,6 +350,9 @@ static void sanity_check_fault(bool is_write, bool is_user, * Userspace trying to access kernel address, we get PROTFAULT for that. */ if (is_user && address >= TASK_SIZE) { + if ((long)address == -1) + return; + pr_crit_ratelimited("%s[%d]: User access of kernel address (%lx) - exploit attempt? (uid: %d)\n", current->comm, current->pid, address, from_kuid(&init_user_ns, current_uid())); |