path: root/drivers
diff options
authorLinus Torvalds <torvalds@linux-foundation.org>2018-01-30 14:18:52 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-30 14:18:52 -0800
commitd4173023e63cb85ec02eda02d1789bf078719f00 (patch)
treea07f5e8d8a98f99c576fedb95035e5289c64276c /drivers
parent0aebc6a440b942df6221a7765f077f02217e0114 (diff)
parentc0f45555b82450a56c0da11866163b764aeb1a21 (diff)
Merge branch 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull siginfo cleanups from Eric Biederman: "Long ago when 2.4 was just a testing release copy_siginfo_to_user was made to copy individual fields to userspace, possibly for efficiency and to ensure initialized values were not copied to userspace. Unfortunately the design was complex, it's assumptions unstated, and humans are fallible and so while it worked much of the time that design failed to ensure unitialized memory is not copied to userspace. This set of changes is part of a new design to clean up siginfo and simplify things, and hopefully make the siginfo handling robust enough that a simple inspection of the code can be made to ensure we don't copy any unitializied fields to userspace. The design is to unify struct siginfo and struct compat_siginfo into a single definition that is shared between all architectures so that anyone adding to the set of information shared with struct siginfo can see the whole picture. Hopefully ensuring all future si_code assignments are arch independent. The design is to unify copy_siginfo_to_user32 and copy_siginfo_from_user32 so that those function are complete and cope with all of the different cases documented in signinfo_layout. I don't think there was a single implementation of either of those functions that was complete and correct before my changes unified them. The design is to introduce a series of helpers including force_siginfo_fault that take the values that are needed in struct siginfo and build the siginfo structure for their callers. Ensuring struct siginfo is built correctly. The remaining work for 4.17 (unless someone thinks it is post -rc1 material) is to push usage of those helpers down into the architectures so that architecture specific code will not need to deal with the fiddly work of intializing struct siginfo, and then when struct siginfo is guaranteed to be fully initialized change copy siginfo_to_user into a simple wrapper around copy_to_user. Further there is work in progress on the issues that have been documented requires arch specific knowledge to sort out. The changes below fix or at least document all of the issues that have been found with siginfo generation. Then proceed to unify struct siginfo the 32 bit helpers that copy siginfo to and from userspace, and generally clean up anything that is not arch specific with regards to siginfo generation. It is a lot but with the unification you can of siginfo you can already see the code reduction in the kernel" * 'siginfo-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (45 commits) signal/memory-failure: Use force_sig_mceerr and send_sig_mceerr mm/memory_failure: Remove unused trapno from memory_failure signal/ptrace: Add force_sig_ptrace_errno_trap and use it where needed signal/powerpc: Remove unnecessary signal_code parameter of do_send_trap signal: Helpers for faults with specialized siginfo layouts signal: Add send_sig_fault and force_sig_fault signal: Replace memset(info,...) with clear_siginfo for clarity signal: Don't use structure initializers for struct siginfo signal/arm64: Better isolate the COMPAT_TASK portion of ptrace_hbptriggered ptrace: Use copy_siginfo in setsiginfo and getsiginfo signal: Unify and correct copy_siginfo_to_user32 signal: Remove the code to clear siginfo before calling copy_siginfo_from_user32 signal: Unify and correct copy_siginfo_from_user32 signal/blackfin: Remove pointless UID16_SIGINFO_COMPAT_NEEDED signal/blackfin: Move the blackfin specific si_codes to asm-generic/siginfo.h signal/tile: Move the tile specific si_codes to asm-generic/siginfo.h signal/frv: Move the frv specific si_codes to asm-generic/siginfo.h signal/ia64: Move the ia64 specific si_codes to asm-generic/siginfo.h signal/powerpc: Remove redefinition of NSIGTRAP on powerpc signal: Move addr_lsb into the _sigfault union for clarity ...
Diffstat (limited to 'drivers')
4 files changed, 5 insertions, 5 deletions
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 16c4a10b7506..1efefe919555 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -410,7 +410,7 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
flags = 0;
if (flags != -1)
- memory_failure_queue(pfn, 0, flags);
+ memory_failure_queue(pfn, flags);
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index 1d60b58a8c19..fe4b24f05f6a 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -569,7 +569,7 @@ store_hard_offline_page(struct device *dev,
if (kstrtoull(buf, 0, &pfn) < 0)
return -EINVAL;
pfn >>= PAGE_SHIFT;
- ret = memory_failure(pfn, 0, 0);
+ ret = memory_failure(pfn, 0);
return ret ? ret : count;
diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c
index ca44e6977cf2..2d9ec378a8bc 100644
--- a/drivers/ras/cec.c
+++ b/drivers/ras/cec.c
@@ -327,7 +327,7 @@ int cec_add_elem(u64 pfn)
} else {
/* We have reached max count for this page, soft-offline it. */
pr_err("Soft-offlining pfn: 0x%llx\n", pfn);
- memory_failure_queue(pfn, 0, MF_SOFT_OFFLINE);
+ memory_failure_queue(pfn, MF_SOFT_OFFLINE);
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index a3fad4ec9870..3f9bd3e4c373 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -595,7 +595,7 @@ static void async_completed(struct urb *urb)
as->status = urb->status;
signr = as->signr;
if (signr) {
- memset(&sinfo, 0, sizeof(sinfo));
+ clear_siginfo(&sinfo);
sinfo.si_signo = as->signr;
sinfo.si_errno = as->status;
sinfo.si_code = SI_ASYNCIO;
@@ -2613,7 +2613,7 @@ static void usbdev_remove(struct usb_device *udev)
if (ps->discsignr) {
- memset(&sinfo, 0, sizeof(sinfo));
+ clear_siginfo(&sinfo);
sinfo.si_signo = ps->discsignr;
sinfo.si_errno = EPIPE;
sinfo.si_code = SI_ASYNCIO;

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