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| author | Stijn Tintel <stijn@linux-ipv6.be> | 2021-11-07 18:33:35 +0200 |
|---|---|---|
| committer | Stijn Tintel <stijn@linux-ipv6.be> | 2021-11-07 18:38:16 +0200 |
| commit | cbeab2cd991929815f50ee995a593db1ab07bf6e (patch) | |
| tree | 2c22a4aeea8c3a712a4b3fa0b023230e14404d15 | |
| parent | da9a8fcbc3cf4319655da1b4d341134b5d4663c1 (diff) | |
| download | upstream-cbeab2cd991929815f50ee995a593db1ab07bf6e.tar.gz upstream-cbeab2cd991929815f50ee995a593db1ab07bf6e.tar.bz2 upstream-cbeab2cd991929815f50ee995a593db1ab07bf6e.zip | |
kernel: add another missing KASAN symbol
Enabling KERNEL_KASAN exposes yet another missing symbol. This did not
appear on bcm27xx but is appearing now on x86/64. Add a new kernel build
option for KASAN_VMALLOC to fix build on x86/64 with KERNEL_KASAN
enabled.
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
| -rw-r--r-- | config/Config-kernel.in | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/config/Config-kernel.in b/config/Config-kernel.in index 902e211ea1..f5b42b71ee 100644 --- a/config/Config-kernel.in +++ b/config/Config-kernel.in @@ -170,6 +170,22 @@ config KERNEL_KASAN_EXTRA compile time. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81715 has more +CONFIG KERNEL_KASAN_VMALLOC + bool "Back mappings in vmalloc space with real shadow memory" + depends on KERNEL_KASAN + By default, the shadow region for vmalloc space is the read-only + zero page. This means that KASAN cannot detect errors involving + vmalloc space. + + Enabling this option will hook in to vmap/vmalloc and back those + mappings with real shadow memory allocated on demand. This allows + for KASAN to detect more sorts of errors (and to support vmapped + stacks), but at the cost of higher memory usage. + + This option depends on HAVE_ARCH_KASAN_VMALLOC, but we can't + depend on that in here, so it is possible that enabling this + will have no effect. + if KERNEL_KASAN config KERNEL_KASAN_GENERIC def_bool y |