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| author | Haavard Skinnemoen <haavard.skinnemoen@atmel.com> | 2009-06-03 14:29:16 +0200 |
|---|---|---|
| committer | Haavard Skinnemoen <haavard.skinnemoen@atmel.com> | 2009-06-13 15:57:30 +0200 |
| commit | bb6e647051a59dca5a72b3deef1e061d7c1c34da (patch) | |
| tree | 6b6ee5c3381e4e84560dc55f200190b1388e76d6 /arch/avr32 | |
| parent | fbe0b8d5822a88e2e769a318eaf3134da5881769 (diff) | |
| download | linux-stable-bb6e647051a59dca5a72b3deef1e061d7c1c34da.tar.gz linux-stable-bb6e647051a59dca5a72b3deef1e061d7c1c34da.tar.bz2 linux-stable-bb6e647051a59dca5a72b3deef1e061d7c1c34da.zip | |
avr32: Fix oops on unaligned user access
The unaligned address exception handler (and others) does not scan the
fixup tables before oopsing. This is bad because it means passing a
badly aligned pointer from user space might crash the kernel.
Fix this by scanning the fixup tables in _exception(). This should
resolve the issue for unaligned addresses as well as other less common
exceptions that might be happening during a userspace access. The page
fault handler already does fixup processing.
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'arch/avr32')
| -rw-r--r-- | arch/avr32/kernel/traps.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/avr32/kernel/traps.c b/arch/avr32/kernel/traps.c index d547c8df157d..6e3d491184ea 100644 --- a/arch/avr32/kernel/traps.c +++ b/arch/avr32/kernel/traps.c @@ -75,8 +75,17 @@ void _exception(long signr, struct pt_regs *regs, int code, { siginfo_t info; - if (!user_mode(regs)) + if (!user_mode(regs)) { + const struct exception_table_entry *fixup; + + /* Are we prepared to handle this kernel fault? */ + fixup = search_exception_tables(regs->pc); + if (fixup) { + regs->pc = fixup->fixup; + return; + } die("Unhandled exception in kernel mode", regs, signr); + } memset(&info, 0, sizeof(info)); info.si_signo = signr; |