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| author |   Rusty Russell <rusty@rustcorp.com.au> | 2007-10-22 11:03:35 +1000 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2007-10-23 15:49:53 +1000 |
| commit | c18acd73ffc209def08003a1927473096f66c5ad (patch) | |
| tree | dd8e292ac8ca90b061b7e37ad6947231ced566e3 /drivers/lguest/x86 | |
| parent | Rename "cr3" to "gpgdir" to avoid x86-specific naming. (diff) | |
| download | linux-dev-c18acd73ffc209def08003a1927473096f66c5ad.tar.xz linux-dev-c18acd73ffc209def08003a1927473096f66c5ad.zip | |
Allow guest to specify syscall vector to use.
(Based on Ron Minnich's LGUEST_PLAN9_SYSCALL patch).
This patch allows Guests to specify what system call vector they want,
and we try to reserve it. We only allow one non-Linux system call
vector, to try to avoid DoS on the Host.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest/x86')
| -rw-r--r-- | drivers/lguest/x86/core.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index 84c09082f27f..a125109446dc 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -530,6 +530,10 @@ int lguest_arch_init_hypercalls(struct lguest *lg) if (put_user(tsc_speed, &lg->lguest_data->tsc_khz)) return -EFAULT; + /* The interrupt code might not like the system call vector. */ + if (!check_syscall_vector(lg)) + kill_guest(lg, "bad syscall vector"); + return 0; } /* Now we've examined the hypercall code; our Guest can make requests. There |