diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2020-01-23 17:30:47 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-26 00:11:35 +1100 |
| commit | def0bfdbd6039e96a9eb2baaa4470b079daab0d4 (patch) | |
| tree | ec4077cf1931e6bd1018a3c3b5526c721b05624b /arch/powerpc/perf/core-book3s.c | |
| parent | 1e3531982ee70adf1880715a968d9c3365f321ed (diff) | |
powerpc: use probe_user_read() and probe_user_write()
Instead of opencoding, use probe_user_read() to failessly read
a user location and probe_user_write() for writing to user.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/e041f5eedb23f09ab553be8a91c3de2087147320.1579800517.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/perf/core-book3s.c')
| -rw-r--r-- | arch/powerpc/perf/core-book3s.c | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/arch/powerpc/perf/core-book3s.c b/arch/powerpc/perf/core-book3s.c index 48604625ab31..3086055bf681 100644 --- a/arch/powerpc/perf/core-book3s.c +++ b/arch/powerpc/perf/core-book3s.c @@ -415,7 +415,6 @@ static void power_pmu_sched_task(struct perf_event_context *ctx, bool sched_in) static __u64 power_pmu_bhrb_to(u64 addr) { unsigned int instr; - int ret; __u64 target; if (is_kernel_addr(addr)) { @@ -426,13 +425,8 @@ static __u64 power_pmu_bhrb_to(u64 addr) } /* Userspace: need copy instruction here then translate it */ - pagefault_disable(); - ret = __get_user_inatomic(instr, (unsigned int __user *)addr); - if (ret) { - pagefault_enable(); + if (probe_user_read(&instr, (unsigned int __user *)addr, sizeof(instr))) return 0; - } - pagefault_enable(); target = branch_target(&instr); if ((!target) || (instr & BRANCH_ABSOLUTE)) |