AuxXxilium/linux_dsm_epyc7002
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847fa1a6d3
linux_dsm_epyc7002/arch/x86
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Steven Rostedt (Red Hat) 847fa1a6d3 ftrace/x86_32: Set ftrace_stub to weak to prevent gcc from using short jumps to it 
With new binutils, gcc may get smart with its optimization and change a jmp
from a 5 byte jump to a 2 byte one even though it was jumping to a global
function. But that global function existed within a 2 byte radius, and gcc
was able to optimize it. Unfortunately, that jump was also being modified
when function graph tracing begins. Since ftrace expected that jump to be 5
bytes, but it was only two, it overwrote code after the jump, causing a
crash.

This was fixed for x86_64 with commit 8329e818f1, with the same subject as
this commit, but nothing was done for x86_32.

Cc: stable@vger.kernel.org
Fixes: d61f82d066 ("ftrace: use dynamic patching for updating mcount calls")
Reported-by: Colin Ian King <colin.king@canonical.com>
Tested-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2016-12-09 09:17:10 -05:00
..
boot
configs IOMMU Updates for Linux v4.9 2016-10-11 12:52:41 -07:00
crypto crypto: aesni: shut up -Wmaybe-uninitialized warning 2016-11-11 08:45:08 -08:00
entry ftrace/x86_32: Set ftrace_stub to weak to prevent gcc from using short jumps to it 2016-12-09 09:17:10 -05:00
events perf/x86/intel: Honour the CPUID for number of fixed counters in hypervisors 2016-10-28 11:06:25 +02:00
ia32
include tracing: Have the reg function allow to fail 2016-12-09 09:13:30 -05:00
kernel tracing: Have the reg function allow to fail 2016-12-09 09:13:30 -05:00
kvm kvm: x86: Check memopp before dereference (CVE-2016-8630) 2016-11-02 21:31:53 +01:00
lguest
lib Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-10-14 14:26:58 -07:00
math-emu
mm patches to fix a regression in 4.9-rc1 on x86 PAT 2016-10-28 09:36:07 -07:00
net
oprofile
pci PCI changes for the v4.9 merge window: 2016-10-07 11:46:37 -07:00
platform x86/platform/UV: Fix support for EFI_OLD_MEMMAP after BIOS callback updates 2016-10-20 08:47:58 +02:00
power
purgatory
ras
realmode
tools
um Merge branch 'gup_flag-cleanups' 2016-10-19 08:39:47 -07:00
video
xen xen: fixes for 4.9-rc2 2016-10-24 19:52:24 -07:00
.gitignore
Kbuild
Kconfig atomic64: no need for CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 2016-10-07 18:46:30 -07:00
Kconfig.cpu
Kconfig.debug
Makefile
Makefile_32.cpu
Makefile.um