Since linux 'commit 2213d44e140f ("s390/syscalls: get rid of system call alias
functions")', s390 syscall wrappers are modified. Adjust it accordingly
for kpatch
Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Kernel v6.1+ commit 7e92e01b7245 ("powerpc: Provide syscall wrapper")
introduced PowerPC specific macros. Add them to kpatch-syscall.h.
WIP: the syscall.patch integration test required
-fno-optimize-sibling-calls for sys_newuname() ... should we move the
attribute out to the patch?
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Kernel version specific __KPATCH_SYSCALL_DEFINEx macros were added to
kpatch-syscall.h for x86, but only single versions for other arches.
This works out for s390x, but not ppc64le for which kpatch-build support
goes back to kernel versions that require slightly different macros.
Reorder the __KPATCH_SYSCALL_DEFINEx macros to define the arch-specific
ones first (arch/.../include/asm/syscall_wrapper.h) and then fall back
to using generic ones (include/linux/syscalls.h versions).
Fixes: #1278
Fixes: 9c0b678621b9 ("macros: add syscall patching macros")
Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Attempting to patch a syscall results in an error due to a missing
fentry hook in the inner __do_sys##name() function. The fentry hook is
missing because of the 'inline' annotation, which invokes 'notrace'.
Add some kpatch-specific syscall definition macros which can be used for
patching a syscall.
These macros are copied almost verbatim from the kernel, the main
difference being a 'kpatch' prefix added to the __do_sys##name()
function name. This causes kpatch-build to treat it as a new function
(due to its new name), and its caller __se_sys##name() function is
inlined by its own caller __x64_sys##name() function, which has an
fentry hook.
To patch a syscall, just use replace the use of the SYSCALL_DEFINE1 (or
similar) macro with the "KPATCH_" prefixed version.
Fixes: #1171
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Sumanth Korikkar
Joe Lawrence
Josh Poimboeuf