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| 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/callchain.c | |
| parent | powerpc/maple: Fix comparing pointer to 0 (diff) | |
| download | linux-dev-def0bfdbd6039e96a9eb2baaa4470b079daab0d4.tar.xz linux-dev-def0bfdbd6039e96a9eb2baaa4470b079daab0d4.zip | |
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/callchain.c')
| -rw-r--r-- | arch/powerpc/perf/callchain.c | 20 |
1 files changed, 3 insertions, 17 deletions
diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c index 35d542515faf..cbc251981209 100644 --- a/arch/powerpc/perf/callchain.c +++ b/arch/powerpc/perf/callchain.c @@ -155,12 +155,8 @@ static int read_user_stack_64(unsigned long __user *ptr, unsigned long *ret) ((unsigned long)ptr & 7)) return -EFAULT; - pagefault_disable(); - if (!__get_user_inatomic(*ret, ptr)) { - pagefault_enable(); + if (!probe_user_read(ret, ptr, sizeof(*ret))) return 0; - } - pagefault_enable(); return read_user_stack_slow(ptr, ret, 8); } @@ -171,12 +167,8 @@ static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret) ((unsigned long)ptr & 3)) return -EFAULT; - pagefault_disable(); - if (!__get_user_inatomic(*ret, ptr)) { - pagefault_enable(); + if (!probe_user_read(ret, ptr, sizeof(*ret))) return 0; - } - pagefault_enable(); return read_user_stack_slow(ptr, ret, 4); } @@ -293,17 +285,11 @@ static void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry, */ static int read_user_stack_32(unsigned int __user *ptr, unsigned int *ret) { - int rc; - if ((unsigned long)ptr > TASK_SIZE - sizeof(unsigned int) || ((unsigned long)ptr & 3)) return -EFAULT; - pagefault_disable(); - rc = __get_user_inatomic(*ret, ptr); - pagefault_enable(); - - return rc; + return probe_user_read(ret, ptr, sizeof(*ret)); } static inline void perf_callchain_user_64(struct perf_callchain_entry_ctx *entry, |