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| author | Vlad Malov <Vlad.Malov@caviumnetworks.com> | 2008-11-18 23:05:46 (GMT) |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2008-12-04 17:47:26 (GMT) |
| commit | e807f9574e37a3f202e677feaaad1b7c5d2c0db8 (patch) | |
| tree | a9b61e4d8f4e53a81df3bb14df0a4c2b037d8d81 | |
| parent | feaf3848a813a106f163013af6fcf6c4bfec92d9 (diff) | |
| download | linux-e807f9574e37a3f202e677feaaad1b7c5d2c0db8.tar.xz | |
MIPS: Fix potential DOS by untrusted user app.
On a 64 bit kernel if an o32 syscall was made with a syscall number less
than 4000, we would read the function from outside of the bounds of the
syscall table. This led to non-deterministic behavior including system
crashes.
While we were at it we reworked the 32 bit version as well to use fewer
instructions. Both 32 and 64 bit versions are use the same code now.
Signed-off-by: Vlad Malov <Vlad.Malov@caviumnetworks.com>
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/kernel/scall32-o32.S | 5 | ||||
| -rw-r--r-- | arch/mips/kernel/scall64-o32.S | 12 |
2 files changed, 6 insertions, 11 deletions
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S index 759f680..34a4dbd 100644 --- a/arch/mips/kernel/scall32-o32.S +++ b/arch/mips/kernel/scall32-o32.S @@ -262,14 +262,11 @@ bad_alignment: LEAF(sys_syscall) subu t0, a0, __NR_O32_Linux # check syscall number sltiu v0, t0, __NR_O32_Linux_syscalls + 1 + beqz t0, einval # do not recurse sll t1, t0, 3 beqz v0, einval - lw t2, sys_call_table(t1) # syscall routine - li v1, 4000 - __NR_O32_Linux # index of sys_syscall - beq t0, v1, einval # do not recurse - /* Some syscalls like execve get their arguments from struct pt_regs and claim zero arguments in the syscall table. Thus we have to assume the worst case and shuffle around all potential arguments. diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S index 6c7ef83..facb41a 100644 --- a/arch/mips/kernel/scall64-o32.S +++ b/arch/mips/kernel/scall64-o32.S @@ -174,14 +174,12 @@ not_o32_scall: END(handle_sys) LEAF(sys32_syscall) - sltu v0, a0, __NR_O32_Linux + __NR_O32_Linux_syscalls + 1 + subu t0, a0, __NR_O32_Linux # check syscall number + sltiu v0, t0, __NR_O32_Linux_syscalls + 1 + beqz t0, einval # do not recurse + dsll t1, t0, 3 beqz v0, einval - - dsll v0, a0, 3 - ld t2, (sys_call_table - (__NR_O32_Linux * 8))(v0) - - li v1, 4000 # indirect syscall number - beq a0, v1, einval # do not recurse + ld t2, sys_call_table(t1) # syscall routine move a0, a1 # shift argument registers move a1, a2 |