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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2020-03-31 18:03:46 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-06-02 12:59:12 +0200 |
| commit | 7cdf4401388572f720403a7038a178a4b30ac14c (patch) | |
| tree | 165538d6d5b268da5d11991675a2822ecd796e93 /arch/powerpc/kernel/entry_32.S | |
| parent | powerpc/entry32: Blacklist exception entry points for kprobe. (diff) | |
| download | linux-7cdf4401388572f720403a7038a178a4b30ac14c.tar.xz linux-7cdf4401388572f720403a7038a178a4b30ac14c.zip | |
powerpc/entry32: Blacklist syscall exit points for kprobe.
kprobe does not handle events happening in real mode.
The very last part of syscall cannot support a trap.
Add a symbol syscall_exit_finish to identify that part and
blacklist it from kprobe.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/23eddf49abb03d1359fa0be4206998eb3800f42c.1585670437.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/kernel/entry_32.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_32.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index c9fc6ea36bc6..5fa192b33509 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -462,6 +462,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX) lwz r7,_NIP(r1) lwz r2,GPR2(r1) lwz r1,GPR1(r1) +syscall_exit_finish: #if defined(CONFIG_PPC_8xx) && defined(CONFIG_PERF_EVENTS) mtspr SPRN_NRI, r0 #endif @@ -469,6 +470,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX) mtspr SPRN_SRR1,r8 SYNC RFI +_ASM_NOKPROBE_SYMBOL(syscall_exit_finish) #ifdef CONFIG_44x 2: li r7,0 iccci r0,r0 @@ -600,6 +602,7 @@ ret_from_kernel_syscall: mtspr SPRN_SRR1, r10 SYNC RFI +_ASM_NOKPROBE_SYMBOL(ret_from_kernel_syscall) /* * The fork/clone functions need to copy the full register set into |