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| author | Stijn Tintel <stijn@linux-ipv6.be> | 2021-11-03 19:38:50 +0200 |
|---|---|---|
| committer | Stijn Tintel <stijn@linux-ipv6.be> | 2021-11-07 17:38:01 +0200 |
| commit | c5fa7ec2a6d97597cfcac8d21657026802ff01a2 (patch) | |
| tree | 556b3dfe9f85432066be88574417e6fd062c7cfd /config/Config-kernel.in | |
| parent | ec68c75c629eed149ed4416d5300328deb53a417 (diff) | |
| download | openwrt-c5fa7ec2a6d97597cfcac8d21657026802ff01a2.tar.gz openwrt-c5fa7ec2a6d97597cfcac8d21657026802ff01a2.tar.bz2 openwrt-c5fa7ec2a6d97597cfcac8d21657026802ff01a2.zip | |
kernel: add missing UBSAN config symbols
Enabling KERNEL_UBSAN exposes several missing symbols. Add new kernel
build options for UBSAN_BOUNDS and UBSAN_TRAP, disable CONFIG_TEST_UBSAN
in the generic kernel configs and enable CONFIG_UBSAN_MISC in generic
5.10 config. The latter symbol was removed in later kernels, as it was
causing some issues, so just disable it in 5.10 instead of adding a
build option for it.
Fixes build failures with KERNEL_UBSAN enabled.
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
Diffstat (limited to 'config/Config-kernel.in')
| -rw-r--r-- | config/Config-kernel.in | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/config/Config-kernel.in b/config/Config-kernel.in index 2243e3e5bc..902e211ea1 100644 --- a/config/Config-kernel.in +++ b/config/Config-kernel.in @@ -114,6 +114,16 @@ config KERNEL_UBSAN_ALIGNMENT Enabling this option on architectures that support unaligned accesses may produce a lot of false positives. +config KERNEL_UBSAN_BOUNDS + bool "Perform array index bounds checking" + depends on KERNEL_UBSAN + help + This option enables detection of directly indexed out of bounds array + accesses, where the array size is known at compile time. Note that + this does not protect array overflows via bad calls to the + {str,mem}*cpy() family of functions (that is addressed by + FORTIFY_SOURCE). + config KERNEL_UBSAN_NULL bool "Enable checking of null pointers" depends on KERNEL_UBSAN @@ -121,6 +131,19 @@ config KERNEL_UBSAN_NULL This option enables detection of memory accesses via a null pointer. +config KERNEL_UBSAN_TRAP + bool "On Sanitizer warnings, abort the running kernel code" + depends on KERNEL_UBSAN + help + Building kernels with Sanitizer features enabled tends to grow the + kernel size by around 5%, due to adding all the debugging text on + failure paths. To avoid this, Sanitizer instrumentation can just + issue a trap. This reduces the kernel size overhead but turns all + warnings (including potentially harmless conditions) into full + exceptions that abort the running kernel code (regardless of context, + locks held, etc), which may destabilize the system. For some system + builders this is an acceptable trade-off. + config KERNEL_KASAN bool "Compile the kernel with KASan: runtime memory debugger" select KERNEL_SLUB_DEBUG |