diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2025-08-22 10:16:47 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2025-08-22 10:16:47 -0400 |
| commit | cf6fc5eefc5bbbbff92a085039ff74cdbd065c29 (patch) | |
| tree | 544eef07deced4a5e2f4972c411ed05282728c37 /drivers | |
| parent | b3d80535e213ad6584577b0f20d9d49ccf233206 (diff) | |
| parent | 3868f910440c47cd5d158776be4ba4e2186beda7 (diff) | |
Merge tag 's390-6.17-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fixes from Alexander Gordeev:
- When kernel lockdown is active userspace tools that rely on read
operations only are unnecessarily blocked. Fix that by avoiding ioctl
registration during lockdown
- Invalid NULL pointer accesses succeed due to the lowcore is always
mapped the identity mapping pinned to zero. To fix that never map the
first two pages of physical memory with identity mapping
- Fix invalid SCCB present check in the SCLP interrupt handler
- Update defconfigs
* tag 's390-6.17-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/hypfs: Enable limited access during lockdown
s390/hypfs: Avoid unnecessary ioctl registration in debugfs
s390/mm: Do not map lowcore with identity mapping
s390/sclp: Fix SCCB present check
s390/configs: Set HZ=1000
s390/configs: Update defconfigs
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/char/sclp.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c index f2e42c1d51aa..98e334724a62 100644 --- a/drivers/s390/char/sclp.c +++ b/drivers/s390/char/sclp.c @@ -77,6 +77,13 @@ unsigned long sclp_console_full; /* The currently active SCLP command word. */ static sclp_cmdw_t active_cmd; +static inline struct sccb_header *sclpint_to_sccb(u32 sccb_int) +{ + if (sccb_int) + return __va(sccb_int); + return NULL; +} + static inline void sclp_trace(int prio, char *id, u32 a, u64 b, bool err) { struct sclp_trace_entry e; @@ -620,7 +627,7 @@ __sclp_find_req(u32 sccb) static bool ok_response(u32 sccb_int, sclp_cmdw_t cmd) { - struct sccb_header *sccb = (struct sccb_header *)__va(sccb_int); + struct sccb_header *sccb = sclpint_to_sccb(sccb_int); struct evbuf_header *evbuf; u16 response; @@ -659,7 +666,7 @@ static void sclp_interrupt_handler(struct ext_code ext_code, /* INT: Interrupt received (a=intparm, b=cmd) */ sclp_trace_sccb(0, "INT", param32, active_cmd, active_cmd, - (struct sccb_header *)__va(finished_sccb), + sclpint_to_sccb(finished_sccb), !ok_response(finished_sccb, active_cmd)); if (finished_sccb) { |